<Page>
                                                                   EXHIBIT 10.30

                        SEPARATION AND RELEASE AGREEMENT

     This SEPARATION AND RELEASE AGREEMENT (the "Agreement") is made and entered
into by and between PLANETCAD INC., ("PLANETCAD") and RICHARD SOWAR ("MR.
SOWAR") (collectively "parties").

                                   I. RECITALS

     WHEREAS, effective as of October 1, 2001, Mr. Sowar's employment as Chief
Technology Officer and any and all other employment positions that Mr. Sowar may
have held at PlanetCAD or its subsidiaries shall cease; and

     WHEREAS, the parties wish to make the separation amicable but conclusive on
the terms and conditions set forth herein; and

     WHEREAS, the mutual considerations expressed herein are deemed by each
party sufficient for their respective promises and covenants; and

     WHEREAS, Mr. Sowar accepts the benefits of this Agreement with the
acknowledgment that by its terms he has been fully and satisfactorily
compensated.

                                  II. COVENANTS

     THEREFORE, in consideration of the mutual promises and covenants contained
in this Agreement, it is hereby agreed by and between the parties hereto as
follows:

     1.   RESIGNATION.

          (a) Mr. Sowar hereby confirms his resignation from his employment as
Chief Technology Officer and any and all other employment and officer positions
that Mr. Sowar may have held at PlanetCAD or its subsidiaries effective October
1, 2001 ("Separation Date").

          (b) Mr. Sowar also shall sign the letter attached as Exhibit C, which,
once delivered to PlanetCAD, shall be irrevocable, any other provision of this
Agreement notwithstanding.

     2.   ACCRUED SALARY AND PAID TIME OFF. As of the Separation Date, the
Company will pay Mr. Sowar all accrued salary and all accrued and unused
vacation earned through the Separation Date, subject to standard payroll
deductions and withholdings. Mr. Sowar is entitled to these payments by law.

     3.   TRANSITION DUTIES AND RESPONSIBILITIES. From the Separation Date until
the SIX MONTH anniversary thereof (the "Transition Period"), Mr. Sowar shall
provide continuing services as a consultant to PlanetCAD on an as-requested
basis; provided that (i) Mr. Sowar shall not be required to report to work
regularly at PlanetCAD's

                                        1
<Page>

facility, but shall provide such consulting services as are reasonably requested
from time to time by PlanetCAD's chief executive officer or his designee, at
such times and places as PlanetCAD shall reasonably request; (ii) PlanetCAD
shall exercise reasonable efforts to eliminate or minimize the extent to which
its requests for consulting services create scheduling conflicts with respect to
other business matters in which Mr. Sowar may be engaged; and (iii) PlanetCAD
shall reimburse Mr. Sowar for out-of-pocket expenses that he reasonably and
necessarily incurs in connection with providing such consulting services, so
long as Mr. Sowar seeks and receives prior approval of such expenses.

     4.   CONSIDERATION. Although the Company has no policy or procedure
requiring payment of any severance benefits nor any contractual obligation to
Mr. Sowar to do so, the Company agrees to the following as part of this
Agreement.

          (a) PAYMENT. If, but only if, Mr. Sowar does not exercise his right of
revocation under paragraph 20(b), below, PlanetCAD shall pay Mr. Sowar a total
amount of TWO HUNDRED THOUSAND DOLLARS AND ZERO CENTS ($200,000.00) IN ONE LUMP
SUM in accordance with PlanetCAD's standard payment practices, which includes
payroll deductions for local, state and federal taxes. Said payment shall be
made on the Effective Date of this Agreement as defined in Paragraph 20(b).

          (b) INSURANCE. If, but only if, Mr. Sowar does not exercise his right
of revocation under paragraph 20(b), below, PlanetCAD will pay the premium cost
for continuing Mr. Sowar's medical, vision, and dental benefits as permitted by
COBRA from October 1, 2001 through September 30, 2002 or until Mr. Sowar becomes
eligible for coverage under another plan, if earlier.

          (c) STOCK OPTIONS. If, but only if, Mr. Sowar does not exercise his
right of revocation under paragraph 20(b), below, then the stock options granted
to Mr. Sowar by PlanetCAD on our about October 17, 1996 (two grants covering a
total of 130,833 shares), October 22, 1998 (two grants covering a total of
50,000 shares), and April 26, 2001 (one grant covering 50,000 shares) (each, an
"Option," and collectively, the "Options") shall be hereby amended such that
each Option shall be deemed fully vested as of the Effective Date, and shall
remain fully exercisable until October 1, 2006, notwithstanding any language to
the contrary in the stock option agreements and/or equity incentive plans
pursuant to which the Options were granted (collectively the "Option Agreements
and Plans"). Mr. Sowar understands that this amendment and/or his exercise of
certain of the Options more than 90 days after the termination of his employment
may affect their characterization as "Incentive Stock Options" and the
application of certain preferential tax treatment afforded to holders of such
Incentive Stock Options, and assumes all risks, costs, expenses and tax
liabilities relating to or arising from the amendment and/or the deferred
exercise of any Option. Mr. Sowar understands and agrees that he should seek
independent professional advice concerning tax and legal matters relating to the
Options and the amendment thereto effected by this Agreement, acknowledges that
he has had a full and fair opportunity to do so, and further acknowledges and
agrees that he has not relied on any information or advice provided by PlanetCAD
or any representative, agent or attorney thereof

                                        2
<Page>

relating to any matterpertaining to this Agreement, including particularly but
without limitation the legal and tax issues relating to the Options and the
amendment thereof. Except as specifically stated in this paragraph, the Options
shall remain in force and effect in accordance with, and subject to, the terms
and conditions stated in the Option Agreements and Plans

     5.   ACKNOWLEDGEMENT. Except as provided for in paragraph 4, Mr. Sowar
acknowledges and agrees that before the effective date of this Agreement he had
been paid all sums that he had earned, or to which he otherwise was entitled, in
connection with his employment with PlanetCAD.

     6.   LOAN FORGIVENESS. If, but only if, Mr. Sowar does not exercise his
right of revocation under paragraph 20(b), below, as of the Effective Date, the
Company shall forgive all outstanding principal and interest payable to it by
Mr. Sowar under that certain promissory note, a copy of which is attached as
Exhibit B, and shall mark the note "cancelled" and return it to Mr. Sowar. Sowar
understands and agrees that the forgiveness of this note creates a tax
withholding obligation on the part of PlanetCAD, and authorizes PlanetCAD to
withhold taxes relating to such forgiveness from the payment payable to him
under paragraph 4 of this Agreement.

     7.   OTHER COMPENSATION. Except as expressly provided herein, Mr. Sowar
acknowledges and agrees that he will not receive (nor is he entitled to receive)
any additional consideration, payments, reimbursements, incentive payments,
stock, equity interests, or benefits of any kind. Mr. Sowar also acknowledges
and agrees that neither this Agreement, nor any other agreement which he has
with PlanetCAD, creates any obligation on the part of PlanetCAD to repurchase
any shares of PlanetCAD stock owned by Mr. Sowar at any time.

     8.   DENIAL OF LIABILITY. The parties acknowledge that any payment by
PlanetCAD and any release by Mr. Sowar pursuant to this Agreement are made in
compromise of disputed claims; that in making any such payment or release,
PlanetCAD and Mr. Sowar in no way admit any liability to each other; and that
the parties expressly deny any such liability.

     9.   NONDISPARAGEMENT. Mr. Sowar and PlanetCAD agree that neither party
will at any time disparage the other to third parties, in any manner likely to
be harmful to the other party, their business reputation, or the personal or
business reputation of its directors, shareholders and/or employees.
Notwithstanding the prohibition in the preceding sentence, each party shall
respond accurately and fully to any question, inquiry, or request for
information when required by legal process.

     10.  PLANETCAD PROPERTY. Immediately preceding the Separation Date, Mr.
Sowar agrees to return to PlanetCAD all PlanetCAD documents (and all copies
thereof) and any and all other PlanetCAD property in his possession, custody or
control, including, but not limited to, financial information, customer
information, customer lists, employee lists, PlanetCAD files, notes, contracts,
drawings, records, business plans and forecasts, financial information,
specifications, computer-recorded information,

                                        3
<Page>

software, tangible property, credit cards, entry cards, identification badges
and keys, and any materials of any kind which contain or embody any proprietary
or confidential material of PlanetCAD and all reproductions thereof
(collectively, "PlanetCAD Information"), excepting only one lap top computer
(Toshiba Tectra 8100), one printer, one Palm PDA, and one mobile telephone
(which Mr. Sowar may retain but to which Mr. Sowar shall be responsible for all
charges for the period following the Transition Period). Notwithstanding any
other provision of this Agreement, until the end of the Transition Period Mr.
Sowar shall be entitled to retain, and use in connection with his performance of
the consulting services contemplated by paragraph 3, above, such PlanetCAD
Information as is necessary for the performance of such services, provided that
at the end of the Transition Period Mr. Sowar shall return all such PlanetCAD
information to PlanetCAD, and not retain any such PlanetCAD Information in any
form. In addition, this Agreement shall not prohibit Mr. Sowar from making and
retaining a paper and/or electronic copy of his personal contact database.

     11.  PROPRIETARY INFORMATION AND INVENTIONS. Mr. Sowar acknowledges and
agrees that he has executed and is and shall be bound by the Proprietary
Information and Inventions Agreement he executed on August 12, 1986 (the
"Confidential Information Agreement"), a copy of which is attached as Exhibit A,
and which is and shall remain a separate and distinct agreement between Mr.
Sowar and PlanetCAD and which shall survive the execution of this Agreement.
Nothing in this Agreement shall be construed to narrow, supercede, modify or
affect in any way the obligations of Mr. Sowar imposed by that or any other
agreement, law, or other source; provided, however, that section 14 of this
Agreement shall supercede section 9(i) and 9(ii) (but no other section) of the
Confidential Information Agreement (the "Pre-existing Non-Compete"), which
Pre-existing Noncompete shall hereafter be of no further force or effect.

     12.  CONFIDENTIALITY OF AGREEMENT. Mr. Sowar and PlanetCAD acknowledge that
confidentiality and nondisclosure are material considerations for the parties
entering into this Agreement. As such, the provisions of this Agreement shall be
held in strictest confidence by Mr. Sowar and PlanetCAD and shall not be
publicized or disclosed in any manner whatsoever, including but not limited to,
the print or broadcast media, any public network such as the Internet, any other
outbound data program such as computer generated mail, reports or faxes, or any
source likely to result in publication or computerized access. Notwithstanding
the prohibition in the preceding sentence: (a) Mr. Sowar may disclose this
Agreement to his immediate family and the parties may disclose this Agreement in
confidence to their respective attorneys, accountants, auditors, tax preparers,
and financial advisors, provided that such third parties agree in advance to
keep such matters confidential; (b) PlanetCAD may disclose this Agreement as
necessary to fulfill standard or legally required corporate reporting or
disclosure requirements; (c) the parties may disclose this Agreement upon
request from any government entity or court of law of competent jurisdiction;
and (d) the parties may disclose this Agreement insofar as such disclosure may
be necessary to enforce its terms or as otherwise required by law, including
without limitation as required by any form of securities-related statute or
regulation. PlanetCAD agrees that it may disclose the provisions of this
Agreement only to such officers or employees of

                                        4
<Page>

PlanetCAD who have a legitimate business need to know of such matters, and only
if those individuals agree in advance to keep such matters confidential.

     13.  UNEMPLOYMENT COMPENSATION. PlanetCAD agrees that it will not contest
any claim filed by Employee or any award made for unemployment compensation as a
result of his termination from employment with PlanetCAD.

     14.  COVENANT NOT TO COMPETE.

          (a) During the Transition Period, Mr. Sowar shall not, whether as an
officer, director, employee, consultant, owner, shareholder, adviser, or joint
venturer, or otherwise engage in any business or other commercial activity
anywhere in the world (the "Protected Region") which directly competes with
PlanetCAD in the development, implementation, marketing or sale of automated
supply chain management solutions ("Competing Business"). This covenant shall
not prohibit Mr. Sowar from owning less than two percent of the securities of
any competitor of PlanetCAD, if such securities are publicly traded on a
nationally recognized stock exchange or over-the-counter market. Mr. Sowar
acknowledges that the foregoing geographic restriction on competition is fair
and reasonable, given the nature and geographic scope of PlanetCAD's business
operations and the nature of Mr. Sowar's position with PlanetCAD. Mr. Sowar also
acknowledges that while employed by PlanetCAD, Mr. Sowar has had access to
information that would be valuable or useful to PlanetCAD's competitors, and
therefore acknowledges that the foregoing restrictions on Mr. Sowar's future
activities are fair and reasonable.

          (b) Mr. Sowar acknowledges the following provisions of Colorado law,
set forth in Colorado Revised Statutes Section 8-2-113(2):

          Any covenant not to compete which restricts the right of any person to
          receive compensation for performance of skilled or unskilled labor for
          any employer shall be void, but this subsection (2) shall not apply
          to:
               ...

               (b)  Any contract for the protection of trade secrets;

               ...

               (d)  Executive and management personnel and officers and
                    employees who constitute professional staff to executive and
                    management personnel.

Mr. Sowar acknowledges that this Agreement is a contract for the protection of
trade secrets within the meaning of Section 8-2-113(2)(b) and is intended to
protect the Confidential Information and Confidential Records identified above
and that during his employment with PlanetCAD he served as an executive or
manager, or professional staff to an executive or manager within the meaning of
Section 8-2-113(2)(d).

                                        5
<Page>

     15.  RELEASE OF CLAIMS BY MR. SOWAR. For the consideration set forth in
this Agreement and the mutual covenants of PlanetCAD and Mr. Sowar, Mr. Sowar
hereby releases, acquits and forever discharges PlanetCAD and its affiliated
corporations and entities, predecessors, officers, directors, agents,
representatives, servants, attorneys, employees, shareholders, heirs, personal
representative, spouses, beneficiaries, executors, trustees, successors and
assigns, all or whom are collectively referred to as "PlanetCAD Releasees", of
and from any and all claims, liabilities, demands, causes of action, costs,
expenses, attorneys' fees, damages, indemnities and obligations of every kind
and nature, in law, equity, or otherwise, known or unknown, suspected and
unsuspected, disclosed and undisclosed, liquidated or contingent, arising out of
or in any way related to agreements, events, acts or conduct at any time prior
to and including the Effective Date, including but not limited to: any and all
such claims and demands directly or indirectly arising out of or in any way
connected with Mr. Sowar's employment with PlanetCAD or the conclusion of that
employment; claims or demands related to salary, bonuses, commissions, incentive
payments, stock, stock options, or any ownership or equity interests in
PlanetCAD; vacation pay, personal time off, fringe benefits, expense
reimbursements, sabbatical benefits, severance benefits, or any other form of
compensation; claims pursuant to any federal, any state or any local law,
statute, common law or cause of action including, but not limited to, the
federal Civil Rights Act of 1964, as amended; attorney's fees, costs, or any
other expenses under Title VII of the Civil Rights Act of 1964, as amended; the
Employment Retirement Income Security Act; the federal Americans with
Disabilities Act of 1990; the Family and Medical Leave Act; the Colorado
Discrimination and Unfair Employment Act, tort law; wrongful discharge;
discrimination; harassment; fraud; negligence, breach of fiduciary duty; claims
for expense reimbursement; defamation; libel; emotional distress; and breach of
the implied covenant of good faith and fair dealing. Mr. Sowar warrants and
represents that he has not filed or otherwise made or asserted any claim,
complaint, or charge against PlanetCAD or any predecessor, affiliate or agent
thereof with any entity including without limitation the Equal Employment
Opportunity Commission and any local, state or federal administrative body or
court. Mr. Sowar agrees that in the event he brings a claim or charge covered by
this release or does not dismiss and withdraw any claim covered by this release,
in which he seeks damages or any other relief against PlanetCAD or in the event
he seeks to recover against PlanetCAD in any claim brought by a governmental
agency on his behalf, this Agreement shall serve as a complete defense to such
claims or charges. By this provision, Mr. Sowar does not release or waive any
right he has to enforce any of PlanetCAD's obligations under this Agreement, to
assert claims in the future based upon any act or omission committed by
PlanetCAD after the Effective Date of this Agreement. Notwithstanding any other
provision of this Agreement, this Agreement shall not be construed or applied so
as to impair, limit or otherwise affect in any way Mr. Sowar's right to
indemnity or defense with respect to acts or omissions occurring during or in
connection with his service as an officer, director and/or consultant to
PlanetCAD.

     16.  PLANETCAD RELEASE OF MR. SOWAR. PlanetCAD, for itself and its
affiliates, (collectively, "PlanetCAD Releasers"), hereby fully and forever
releases and discharges Mr. Sowar, and his heirs, representatives, assigns,
attorneys, and any and all other persons or entities that are now or may become
liable to any PlanetCAD

                                        6
<Page>

Releaser on account of Mr. Sowar's employment with PlanetCAD or separation
therefrom, all of whom are collectively referred to as "Mr. Sowar's Releasees,"
of and from any and all actions, causes of action, claims, demands, liabilities,
costs and expenses, including attorneys' fees, damages and obligations of every
kind and nature whatsoever, in law, equity or otherwise, whether known or
unknown, suspected and unsuspected, disclosed and undisclosed, liquidated or
contingent, arising out of or in any way related to agreements, events, acts or
conduct at any time prior to and including the Effective Date, including but not
limited to claims that PlanetCAD Releasers, or any person acting under any of
them, had, owned or held, claimed to have, own or hold or may now have, or claim
at any future time to have against Mr. Sowar or his Mr. Sowar's Releasees, based
in whole or in part upon any act or omission occurring prior to and including
the Effective Date, without regard to present actual knowledge of such acts or
omissions; EXCEPT as specifically provided otherwise in this Agreement; and
EXCEPT claims arising from or relating to any intentional or willful act or
omission on the part of Mr. Sowar.

     17.  TAX CONSEQUENCES. Mr. Sowar agrees to pay all of his share of taxes
due in connection with payment or other benefits he receives under this
Agreement, and to indemnify PlanetCAD for and hold PlanetCAD harmless from any
and all taxes, interest, penalties and all related costs and expenses asserted
against or incurred by PlanetCAD in connection with any failure to withhold or
pay taxes due on any consideration provided by PlanetCAD pursuant to this
Agreement, and/or the loan forgiveness reflected in paragraph 6 above. Mr. Sowar
expressly acknowledges that PlanetCAD has not made, nor herein makes, any
representation about the tax consequences of any consideration provided by
PlanetCAD to Mr. Sowar pursuant to this Agreement, and that he understands that
he should seek professional tax advice before executing this Agreement.

     18.  ADMINISTRATIVE MATTERS. Mr. Sowar covenants that following the
Effective Date he will not take any action, or encourage any other person to
take any action, calculated or likely to result in the initiation or an inquiry,
investigation or other action concerning PlanetCAD by any federal, state or
local governmental body or agency; provided, however, that nothing in this
paragraph 18 shall in any way limit or curtail Mr. Sowar's rights as a
shareholder of the Company to participate to the fullest extent in any and all
shareholder meetings, discussions or any other activities associated with the
ownership of Company stock.

     19.  COVENANT OF COOPERATION IN LITIGATION. Mr. Sowar acknowledges that
because of his position with PlanetCAD, he may possess information that may be
relevant to or discoverable in litigation in which PlanetCAD is involved or may
in the future be involved. Mr. Sowar agrees that he shall testify truthfully in
connection with any such litigation, shall cooperate with PlanetCAD in
connection with such litigation, and that his duty of cooperation shall include
an obligation to meet with PlanetCAD representatives and/or counsel concerning
such litigation for such purposes, and at such times and places, as PlanetCAD
deems necessary, in its sole discretion, and to appear for deposition upon
PlanetCAD's request and without a subpoena. Mr. Sowar shall not be entitled to
any compensation in connection with his duty of cooperation,

                                        7
<Page>

except that PlanetCAD may reimburse Mr. Sowar for reasonable out-of-pocket
expenses that he incurs in honoring his obligation of cooperation.

     20.  ACKNOWLEDGMENT OF RIGHTS UNDER THE OLDER WORKER'S BENEFITS PROTECTION
ACT.

          (a) Mr. Sowar agrees and acknowledges that he: (i) understands the
language used in this Agreement and the Agreement's legal effect; (ii)
understands that by signing this Agreement he is giving up the right to sue
PlanetCAD for age discrimination; (iii) will receive compensation under this
Agreement to which he would not have been entitled without signing this
Agreement; (iv) has been advised by PlanetCAD to consult with an attorney and
tax advisor before signing this Agreement; and (v) was given no less than
twenty-one days to consider whether to sign this Agreement.

          (b) For a period of seven calendar days after the execution of this
Agreement, Mr. Sowar may, in his sole discretion, rescind this Agreement, by
delivering a written notice of recision to PlanetCAD. If Mr. Sowar rescinds this
Agreement within seven calendar days after the execution of this Agreement, this
Agreement shall be void, all actions taken pursuant to this Agreement (excepting
only as set forth in paragraph 1(b), above) shall be reversed, and neither this
Agreement nor the fact of or circumstances surrounding its execution shall be
admissible for any purpose whatsoever in any proceeding between the parties,
except in connection with a claim or defense involving the validity or effective
rescission of this Agreement. If Mr. Sowar does not rescind this Agreement
within seven calendar days after the execution of the Agreement, this Agreement
shall become final and binding and shall be irrevocable ("Effective Date").

     21.  NO THIRD-PARTY RIGHTS. The parties agree that by making this Agreement
they do not intend to confer any benefits, privileges, or rights to others. The
Agreement is strictly between the parties hereto, subject to the terms of
paragraph 24 below, and shall not be construed to vest in any other the status
of third-party beneficiary.

     22.  VOLUNTARY AND KNOWINGLY. Mr. Sowar acknowledges that in executing this
Agreement, he has reviewed it and understands its terms and has had an
opportunity and was advised to seek guidance from counsel of his own choosing,
and was fully advised of his rights under law, and acted knowingly and
voluntarily.

     23.  DUTY TO EFFECTUATE. The parties agree to perform any lawful additional
acts, including the execution of additional agreements, as are reasonably
necessary to effectuate the purpose of this Agreement.

     24.  ENTIRE AGREEMENT. This Agreement, including the incorporated Exhibits
A, B and C, constitutes the complete, final and exclusive embodiment of the
entire agreement between Mr. Sowar and PlanetCAD with regard to the subject
matter hereof. This Agreement is entered into without reliance on any promise or
representation,

                                        8
<Page>

written or oral, other than those expressly contained herein. It may not be
modified, amended or changed except in writing signed by Mr. Sowar and the
President and CEO of PlanetCAD, Inc.

     25.  SUCCESSORS AND ASSIGNS. This Agreement shall bind the heirs, personal
representatives, successors, assigns, executors and administrators of each
party, and inure to the benefit of each party, its heirs, successors and
assigns.

     26.  APPLICABLE LAW. The parties agree and intend that this Agreement be
construed and enforced in accordance with the laws of the State of Colorado.

     27.  FORUM. Any controversy arising out of or relating to this Agreement or
the breach thereof, or any claim or action to enforce this Agreement or portion
thereof, or any controversy or claim requiring interpretation of this Agreement
must be brought in a forum located within the State of Colorado. No such action
may be brought in any forum outside the State of Colorado. Any action brought in
contravention of this paragraph by one party is subject to dismissal at any time
and at any stage of the proceedings by the other, and no action taken by the
other in defending, counterclaiming, or appealing shall be construed as a waiver
of this right to immediate dismissal. A party bringing an action in
contravention of this paragraph shall be liable to the other party for the
costs, expenses and attorney's fees incurred in successfully dismissing the
action or successfully transferring the action to a forum located within the
State of Colorado.

     28.  SEVERABLE. If any provision of this Agreement is determined to be
invalid, void or unenforceable, in whole or in part, this determination will not
affect any other provision of this Agreement, and the provision in question
shall be modified so as to be rendered enforceable.

     29.  ENFORCE ACCORDING TO TERMS. The parties intend this Agreement to be
enforced according to its terms and the language of all parts of this Agreement
shall in all cases be construed as a whole, according to its fair meaning, and
not strictly for or against either of the parties.

     30.  ATTORNEY'S FEES. The prevailing party in an action to enforce the
terms of this Agreement shall be entitled to its reasonable costs, expenses, and
attorney's fees.

     31.  SECTION HEADINGS. The section and paragraph headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement.

                                        9
<Page>

     IN WITNESS WHEREOF, the parties have duly authorized and caused this
Agreement to be executed as follows:

Richard Sowar                               PlanetCAD INC.
An individual

         /s/ Richard Sowar                  By:      /s/ Jim Bracking
---------------------------------              -----------------------------
Richard Sowar
                                            Its:     President and CEO
                                                -----------------------------
Date:  October 18, 2001                     Date: October 18, 2001
     ------------                                         --

                                       10

<Page>

                                    Exhibit A
                   Non-Competition, Non-Disclosure and Patent
                       and Invention Assignment Agreement

                                                                 August 12, 1986

     In consideration of my employment or continued employment, as the case may
be, with Spacial Technology, Incorporated, a Delaware corporation (the
"Company"), and the compensation received by me from the Company from time to
time, I, Richard M. Sowar, hereby agree with the Company as follows:

     1.   PROPRIETARY INFORMATION AND INVENTIONS. I understand and acknowledge
that:

          (a)  The Company is engaged in a continuous program of research,
     design, development, production and marketing with respect to its business
     and that as part of my employment by the Company I am (or may be) expected
     to make new contributions and inventions of value to the Company.

          (b)  My employment creates a relationship of confidence and trust
     between me and the Company with respect to certain information applicable
     to the business of the Company or applicable to the business of any client
     or customer of the Company, which may be made known to me by the Company or
     by any client or customer of the Company, or learned by me during the
     period of my employment.

          (c)  The Company possesses and will continue to possess information
     that has been created, discovered, or developed by, or otherwise become
     known to, the Company (including, without limitation, information created,
     discovered, developed or made known by me during the period of or arising
     out of my employment by the Company) or in which property rights have been
     or may be assigned or otherwise conveyed to the Company, which information
     has commercial value in the business in which the Company is engaged and is
     treated by the Company as confidential. All such information is hereinafter
     called "Proprietary Information", which term, as used herein, shall also
     include, but shall not be limited to, systems, processes, formulae, data,
     functional specifications, computer programs, know-how, improvements,
     discoveries, developments, designs, inventions, techniques, marketing
     plans, strategies, forecasts, new products, unpublished financial
     statements, budgets, projections, licenses, prices, costs, and customer and
     supplier lists.

          (d)  As used herein, the period of my employment includes any time
     during which I may be retained by the Company as a consultant.

     2.   OWNERSHIP OF PROPRIETARY INFORMATION. All Proprietary Information
shall be the sole property of the Company and its assigns, and the Company and
its assigns shall be the sole owner of all patents, copyrights, trademarks and
other rights in connection therewith. I hereby assign to the Company any rights
I may have or acquire in such Proprietary Information. At all times, both during
my employment by the Company and after its termination, I will keep

<Page>

in strictest confidence and trust all Proprietary Information and I will not use
or disclose any Proprietary Information without the written consent of the
Company.

     3.   OTHER EMPLOYMENT. During the period of my employment by the Company I
will not, without the Company's prior written consent, engage in any employment
or business other than for the Company.

     4.   DOCUMENTATION. In the event of the termination of my employment for
any reason, I will deliver to the Company all documents, notes, drawings,
specifications, computer programs, data, and other materials of any nature
pertaining to any Proprietary Information or to my work with the Company, and
will not take any of the foregoing, or any reproduction of any of the foregoing
that is embodied in a tangible medium of expression.

     5.   DISCLOSURE OF INVENTIONS. I will promptly disclose to the Company (or
any persons designated by it) all discoveries, developments, designs,
improvements, inventions, formulae, processes, techniques, computer programs,
know-how, and data, whether or not patentable or registrable under copyright or
similar statutes, made or conceived or reduced to practice or learned by me,
either alone or jointly with others, during the period of my employment that are
related to the business of the Company, result from tasks assigned to me by the
Company, or result from the use of premises or property (including computer
systems) owned, leased, or contracted for by the Company (all such discoveries,
developments, designs, improvements, inventions, formulae, processes,
techniques, computer programs, know-how, and data are hereinafter referred to as
"Inventions"). I will also promptly disclose to the Company, and the Company
hereby agrees to receive all such disclosures in confidence, all other
discoveries, developments, designs, improvements, inventions, formulae,
processes, techniques, computer programs, strategies, know-how, and data,
whether or not patentable or registrable under copyright or similar statutes,
made or conceived or reduced to practice or learned by me, either alone or
jointly with others, during the period of my employment for the purpose of
determining whether they constitute "Inventions", as defined above.

     6.   OWNERSHIP OF INVENTIONS. All Inventions shall be the sole property of
the Company and its assigns, and the Company and its assigns shall be the sole
owner of all patents, copyrights, trademarks and other rights in connection
therewith. I hereby assign to the company any rights I may have or acquire in
such Inventions. I shall assist the Company in every proper way as to all such
Inventions (but at the Company's expense) to obtain and from time to time
enforce patents, copyrights, trademarks and other rights and protections
relating to said Inventions in any and all countries, and to that end I will
execute all documents for use in applying for and obtaining such patents,
copyrights, trademarks and other rights and protections on and enforcing such
Inventions, as the Company may desire, together with any assignments thereof to
the Company or persons designated by it. My obligation to assist the Company in
obtaining and enforcing patents, copyrights, trademarks and other rights and
protections relating to such Inventions in any and all countries shall continue
beyond the termination of my employment, but the Company shall compensate me at
a reasonable rate after my termination for time actually spent by me at the
Company's request on such assistance. In the event the Company is unable, after
reasonable effort, to secure my signature on any document or documents needed to
apply for or prosecute any patent, copyright, or other right or protection
relating to an Invention, for any other reason whatsoever, I hereby irrevocably
designate and

                                       2
<Page>

appoint the Company and its duly authorized officers and agents as my agent and
attorney-in-fact, to act for and on my behalf to execute and file any such
application or applications and to do all other lawfully permitted acts to
further the prosecution and issuance of patents, copyrights, or similar
protections thereon with the same legal force and effect as if executed by me.

     7.   PRIOR EMPLOYMENT AGREEMENTS. I represent and warrant that my
performance of all the terms of this Agreement and as an employee of the Company
does not and will not breach any agreement to keep in confidence proprietary
information acquired by me in confidence or in trust prior to my employment by
the Company. I have not entered into and shall not enter into any agreement,
either written or oral, in conflict herewith.

     8.   USE OF CONFIDENTIAL INFORMATION OF OTHER PERSONS. I represent, as part
of the consideration for the offer of employment extended to me by the Company
and of my employment or continued employment by the Company, that I have not
brought and will not bring with me to the Company or use at the Company any
materials or documents of a former employer that are not generally available to
the public, unless express written authorization from the former employer for
their possession and use has been obtained. I also understand that, in my
employment with the Company, I am not to breach any obligation of
confidentiality that I have to former employers and agree to fulfill all such
obligations during my employment with the Company.

     9.   RESTRICTIVE COVENANT. I hereby acknowledge and recognize my possession
of Proprietary Information and the highly competitive nature of the business of
the Company and accordingly agree that, in consideration of the premises
contained herein, I will not, during the period of my employment by the Company
or for a period of two years following the termination of my employment with the
Company for any reason whatsoever, (i) directly or indirectly engage in any
Competitive Business (as hereinafter defined), whether such engagement shall be
as an employer, officer, director, owner, employee, partner or other participant
in any Competitive Business, (ii) assist others in engaging in any Competitive
Business in the manner described in the foregoing clause (i), or (iii) induce
employees of the Company or its subsidiaries to terminate their employment with
the Company or such affiliate or subsidiary or engage in any Competitive
Business. As used in this Section 9 the term "Competitive Business" means and
includes the business conducted by the Company or any of its affiliates or
subsidiaries on the date hereof or as shall be conducted by the Company or any
of its affiliates or subsidiaries upon the termination of my employment with the
Company, in each case limited geographically to any state of the United States
in which the Company conducts, or in which the Company shall conduct, at any
time, during the period commencing with the date of this Agreement through the
second anniversary of the date of termination of any employment, its business.

     10.  REMEDIES. My duties under this Agreement shall survive termination of
my employment with the Company. I acknowledge that a remedy at law for any
breach or threatened breach of the provisions of this Agreement would be
inadequate and therefore agree that the Company shall be entitled to injunctive
relief in addition to any other available rights and remedies in case of any
such breach or threatened breach; PROVIDED, HOWEVER, that nothing contained
herein shall be construed as prohibiting the Company from pursuing any other
remedies available for any such breach or threatened breach.

                                       3
<Page>

     11.  ASSIGNMENT. This Agreement and the rights and obligations of the
parties hereto shall bind and inure to the benefit of any successor or
successors of the Company by reorganization, merger or consolidation or
otherwise and any assignee of all or substantially all of its business and
properties, except that neither this Agreement nor any rights or benefits
hereunder may be assigned by me.

     12.  INTERPRETATION. It is the desire and intent of the parties hereto that
the provisions of this Agreement shall be enforced to the fullest extent
permissible under the laws and public policies applied in each jurisdiction in
which enforcement is sought. Accordingly, if any particular provision of this
Agreement shall be adjudicated to be invalid or unenforceable, such provision
shall be deemed amended to delete therefrom the portion thus adjudicated to be
invalid or unenforceable, such deletion to apply only with respect to the
operation of such provision in the particular jurisdiction in which such
adjudication is made. In addition, if any one or more of the provisions
contained in this Agreement shall for any reason be held to be excessively broad
as to duration, geographical scope, activity or subject, it shall be construed
by limiting and reducing it, so as to be enforceable to the extent compatible
with the applicable law as it shall then appear.

     13.  NOTICES. Any notice which a party is required or may desire to give
pursuant to this Agreement shall be given by personal delivery or registered or
certified mail, return receipt requested, addressed to the undersigned employee
at the address of the employee of record with the Company and addressed to the
Company at its principal office, or at such other place as either party may from
time to time designate in writing. The date of personal delivery or the dates of
mailing any such notice shall be deemed to be the date of delivery thereof.

     14.  WAIVERS. If either party shall waive any breach of any provision of
this Agreement, he or it shall not thereby be deemed to have waived any
preceding or succeeding breach of the same or any other provision of this
Agreement.

     15.  HEADINGS. The headings of the sections hereof are inserted for
convenience only and shall not be deemed to constitute a part hereof nor to
affect the meaning hereof.

     16.  GOVERNING LAW. This Agreement shall be governed by, and construed and
enforced in accordance with, the laws of the State of Colorado.

     17.  COMPLETE AGREEMENT; AMENDMENTS; PRIOR AGREEMENTS. The foregoing is the
entire agreement of the parties with respect to the subject matter hereof and
may not be amended, supplemented, cancelled or discharged except by written
instrument executed by both parties hereto. This Agreement supersedes any and
all prior agreements between the parties hereto with respect to the matters
covered hereby.



                                        /s/ Richard M. Sowar
                                        -----------------------------------
                                        Employee


Accepted and agreed to as of
the date first above written by
SPACIAL TECHNOLOGY INCORPORATED

By :      [ILLEGIBLE]
     --------------------------

                                       4
<Page>


                                    EXHIBIT B
                                 PROMISSORY NOTE



$30,000.00                                                     Boulder, Colorado
                                                                 August 14, 2000


     FOR VALUE RECEIVED, the undersigned, Richard M. Sowar ("Borrower"), whose
address is 3008 Lakeridge Trail, Boulder, CO 80302, promises to pay to the order
of PlanetCAD Inc., a Delaware corporation, or its permitted successors and
assigns (collectively, the "Holder"), at 2520 55th Street, Suite 200, Boulder,
Colorado 80301 or at such other place as Holder may designate in writing, the
principal sum of Thirty Thousand and No/100ths Dollars ($30,000.00), together
with interest on the unpaid principal balance from the date hereof until paid at
the rate of 8% per annum.

     All amounts payable under this Note shall be due and payable on August 14,
2002. All payments made hereunder shall be payable in immediately available
United States funds to the Holder pursuant to the written instructions of the
Holder. If any payments are required to be made on a day that is not a Business
Day (as hereinafter defined), the date on which such payment is required to be
made shall be extended to, and such payment shall be required to be made on, the
next Business Day. "Business Day" shall mean a day other than Saturday, Sunday
and any day that shall be in the City of Denver, Colorado, a legal holiday or a
day on which banking institutions are authorized by law to close.

     This Note may be prepaid, in whole or in part, at any time and from time to
time, without premium or penalty, at the option of the Borrower.

     All payments received hereunder, including prepayments as provided below,
shall be applied first to accrued interest as of the date of payment and then to
the outstanding principal balance on this Note; provided, however, that during
the existence of any default or delinquency under this Note, Holder, at Holder's
option, may apply all payments made on this Note to the payment of such amounts
due to Holder hereunder, including without limitation late charges as provided
below, in such order as Holder elects.

     Any notice provided for in this Note shall be in writing and shall be given
and be effective upon delivery to the party or mailing such notice by certified
mail, return receipt requested, addressed to the party at the address stated
above, or to such other address as the party may designate by notice given in
accordance with this paragraph.

<Page>

     In the event this Note is placed in the hands of an attorney for collection
or in the event that proceedings at law or in equity or bankruptcy, receivership
or other legal proceedings are instituted in connection herewith, or in the
event this Note is placed in the hands of an attorney to protect, defend or
enforce the rights of Holder, Borrower agrees to pay to Holder all of Holder's
costs of collecting or attempting to collect this Note or protecting, defending
or enforcing such rights, including without limitation court costs and
reasonable attorneys' fees, in addition to all principal, interest and other
amounts payable hereunder.

     The undersigned hereby waives presentment, demand for payment, notice of
dishonor, and any and all other notices or demands in connection with the
delivery, acceptance, performance, default, or enforcement of this Note, and
hereby consents to any extensions of time, renewals, releases of any party to
this Note, waivers, or modifications that may be granted or consented to by the
Holder in respect to the time of payment or any other provision of this Note. No
waiver of any payment or other right under this Note shall operate as a waiver
of any other payment or right.

     THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
(EXCLUSIVE OF THE LAWS GOVERNING CONFLICTS OF LAWS) OF THE STATE OF COLORADO.



                                        /s/ Richard M. Sowar
                                        ---------------------------
                                        RICHARD M. SOWAR


                                       2


<Page>

                                    EXHIBIT C

October 18, 2001

Board of Directors
c/o Jim Bracking
PlanetCAD Inc.
2520 55th Street, Ste. 200
Boulder, CO 80301


To the Board of Directors of PlanetCAD Inc.:

     I hereby resign from the PlanetCAD Inc. Board of Directors, effective upon
your receipt of this letter.


                                        Sincerely,

                                        /s/ Richard M. Sowar

                                        Richard M. Sowar