Document:

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                                                                 Exhibit No. 4.1

                              AMENDING AGREEMENT

          This Amendment Agreement (this "Amendment"), dated as of January 3,
                                          ---------
2002, is entered into by and among Constellation 3D Technology Limited, a
corporation organized under the laws of the British Virgin Islands ("ConTech"),
                                                                     -------
TIC Target Invest Consulting, LLC, a financing corporation organized under the
laws of St. Kitts & Nevis ("TIC") with its principal office located at Churer
                            ---
Strasse 35, CH-9470, Buchs, SG, Switzerland and Constellation 3D, Inc., a
Delaware corporation ("C3D").
                       ---

          A.  TIC and ConTech are parties to that certain Loan Agreement, dated
as of November 17, 2001 (the "Loan Agreement").
                              --------------

          B.  ConTech and C3D are parties to that certain Option Agreement,
dated as of November 17, 2001 (the "Option Agreement").
                                    ----------------

          C.  For good and valuable consideration, the receipt and sufficiency
of which is hereby acknowledged, the parties hereto agree as follows:

          1.  Amendments to Loan Agreement.
              ----------------------------

          (a) Each of TIC and ConTech hereby agree that the first sentence in
Section 2.4(a) of the Loan Agreement is hereby amended in its entirety to read
as follows:

          "Within fifty-one (51) Business Days after the Closing Date, the
          Lender shall designate a date which is a Business Day within sixty-two
          (62) Business Days after the Closing Date for the funding of the Loan
          (the "Funding Date")."
                ------------

          (b) Each of TIC and ConTech hereby agree that the references to
"Schedule 3.5" and "Schedule 3.11" in Section 3.4 and Section 3.9, respectively,
 ------------       -------------
of the Loan Agreement are hereby amended to be references to "Schedule 3.4" and
                                                              ------------
"Schedule 3.9," respectively.
 ------------

          2.  Agreement Relating to Bridge Note.
              ---------------------------------

          (a) Each of C3D and ConTech agree that:

              (i)  Upon and subject to ConTech's receipt of $2,000,000 pursuant
                   to a Bridge Note between ConTech and TIC (the "TIC Bridge
                   Note"), ConTech shall advance the $2,000,000 to C3D pursuant
                   to the terms of a Bridge Note between C3D and ConTech, a form
                   of which is attached hereto as Attachment A (the "Bridge
                   Note"); and

              (ii) Simultaneous with the funding of the Bridge Note, C3D shall
                   execute and deliver the Bridge Note to ConTech.

          (b) Each of ConTech and TIC agree that:
<PAGE>

               (i)  TIC shall, by January 31, 2002, advance $2,000,000 to
                    ConTech pursuant to the terms of the TIC Bridge Note, a form
                    of which is attached hereto as Attachment B; and

               (ii) Simultaneous with the funding of the TIC Bridge Note,
                    ConTech shall execute and deliver the TIC Bridge Note to
                    TIC.

          3.   Additional Agreement regarding the Loan Agreement.  Each of TIC
               -------------------------------------------------
and ConTech hereby acknowledges and agrees that Schedule 3.3, Schedule 3.4 and
                                                ------------  ------------
Schedule 3.9 of the Loan Agreement contain no disclosures.
------------

          4.   Amendment to Option Agreement. Each of ConTech and C3D hereby
               -----------------------------
agree that the provisions of Section 4(b), Section 4(c), Section 4(d), Section
4(e) and Section 4(f) of the Option Agreement are each hereby deleted in their
entirety and in each case replaced with the word "Reserved".

          5.   Miscellaneous. Except as modified by this Amendment, the terms of
               -------------
the Loan Agreement and the Option Agreement, respectively, shall remain in full
force and effect. This Amendment may be executed by any of the parties to this
Amendment on separate counterparts and all of said counterparts taken together
shall be deemed to constitute one and the same instrument.

                           [signature page follows]
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed and delivered by their duly authorized officers as of the date first
written above.

                         CONSTELLATION 3D TECHNOLOGY LIMITED

                         By:  /s/  Eugene Levich
                            --------------------------------
                            Name:  Eugene Levich
                            Title: Director

                         CONSTELLATION 3D, INC.

                         By:  /s/ Michael Goldberg
                            --------------------------------
                            Name: Michael Goldberg
                            Title: Secretary and Director of Legal Affairs

                         TIC TARGET INVEST CONSULTING, LLC

                         By: /s/ Andre Khayyam
                            --------------------------------
                            Name:  Andre Khayyam
                            Title: Managing Director

ACKNOWLEDGMENT

          The undersigned hereby acknowledges that the term "Funding Date," as
used in the Loan Agreement, dated as of November 17, 2001, by and between
ConTech and the undersigned shall have the meaning ascribed to such term in
Section 2.4(a) of the Loan Agreement, as amended pursuant to the terms of this
Amendment.

                         CONSTELLATION 3D, INC.

                         By:  /s/ Michael Goldberg
                             ----------------------------
                            Name: Michael Goldberg
                            Title: Secretary and Director of Legal Affairs<PAGE>

                                  BRIDGE NOTE

          FOR VALUE RECEIVED, CONSTELLATION 3D, INC., a corporation organized
under the laws of the State of Delaware with its principal office located at 805
Third Avenue, 14th Floor, New York, New York 10022 (the "Borrower"), hereby
                                                         --------
unconditionally promises to pay to the order of CONSTELLATION 3D TECHNOLOGY
LIMITED, a corporation organized under the laws of the British Virgin Islands
with its principal office located at 12, the Shrubberies, George Lane, London
E18 1BD, England (the "Lender"), in immediately available funds, the principal
                       ------
amount of [US TWO MILLION AND 00/100 DOLLARS ($2,000,000)] on November 19, 2002
and to pay interest on the unpaid principal amount of this Note at a rate of
eight percent (8%) per annum during the period commencing on the date hereof and
thereafter, to be computed as specified in Section 2.7 of the Loan Agreement,
dated as of November 17, 2001 (as amended, supplemented or otherwise modified
from time to time, the "Loan Agreement"), between the Borrower and the Lender.
                        --------------
The unpaid principal amount of this Note (together with accrued interest hereon)
is subject to automatic conversion as described herein.

          Terms used herein which are defined in the Loan Agreement shall have
such defined meanings unless otherwise defined herein or unless the context
otherwise requires.

          1.   Conversion; Use of Proceeds.  This Note evidences an advance
               ---------------------------
made in connection with the Loan Agreement (the "Advance"). The Lender shall
                                                 -------
disburse the Advance by authorizing TIC Target Invest Consulting, LLC ("TIC") to
                                                                        ---
transfer the proceeds of an advance made by TIC to the Lender in accordance with
that certain Bridge Note, of even date herewith, made by the Lender in favor of
TIC (the "ConTech Note"), directly to the Designated Account. The unpaid
          ------------
principal amount of this Note (together with accrued interest hereon) shall be
converted in whole into the Loan upon the Funding Date. The amount of the Loan
to be funded by the Lender to the Borrower on the Funding Date pursuant to the
Loan Agreement shall be reduced by the aggregate amount of such unpaid principal
and accrued interest. On the Funding Date, this Note shall be cancelled and the
Note issued on the Funding Date shall reflect both the Advance (together with
accrued interest thereon) and the amount of the Loan funded on the Funding Date.
Notwithstanding anything to the contrary contained herein, if the Loan is not
funded (and provided that the failure to fund the Loan is solely attributable to
TIC), on November 19, 2002 the unpaid principal of this Note (together with
accrued and unpaid interest hereon) shall automatically convert into fully paid
and non-assessable shares of the Borrower's Common Stock, par value $.00001 per
share (the "Common Stock"). Such conversion shall be effected at the Note
            ------------
Conversion Rate (as such term is defined in that certain Option Agreement, dated
as of November 17, 2001, by and between the Borrower and the Lender).  In the
event of such conversion, the Lender hereby instructs the Borrower to issue and
deliver such shares directly to TIC in full satisfaction of the Lender's
obligations to TIC under the ConTech Note.  The Advance shall be used by the
Borrower for general corporate purposes.

          2.   Representations and Warranties of the Borrower.  The Borrower
               ----------------------------------------------
represents and warrants to the Lender as follows:
<PAGE>

               (a)  The Borrower is a corporation duly organized, validly
existing, and in good standing under the laws of the State of Delaware, with all
power to own its properties and conduct its business as presently conducted.

               (b)  The Borrower has all requisite corporate power and authority
to make and perform its obligations under this Note. This Note has been duly
authorized by all necessary corporate action and has been duly executed and
delivered by the Borrower and constitutes the legal, valid and binding
obligation of the Borrower enforceable against the Borrower in accordance with
its terms, except as such enforcement may be limited by principles of public
policy, laws pertaining to bankruptcy, moratorium, relief of debtors, insolvency
and other laws affecting the rights of creditors generally, and equitable
principles and remedies.

               (c)  The making of this Note, the compliance by the Borrower with
all of the provisions of this Note and the consummation of the transactions
contemplated herein will not conflict with or result in a breach or violation of
or default under, or result in the creation or imposition of any lien, charge or
encumbrance upon the properties or assets of the Borrower pursuant to (i) its
certificate of incorporation or by-laws, or (ii) any indenture, mortgage, deed
of trust, loan agreement or other agreement or instrument to which the Borrower
is bound; nor will such action result in any violation of the certificate of
incorporation or by-laws of the Borrower, or any other order, law, rule or
regulation of any court or governmental agency or body or arbitration body
having jurisdiction over the Borrower or any properties of the Borrower; and no
consent, approval, authorization, notification or order of, or filing with, any
court or governmental agency or body is required for the consummation by the
Borrower of the transactions contemplated hereby, except as have been obtained
from the officials of the relevant jurisdictions and which are in full force and
effect.

          3.   Events of Default.  The occurrence of any one or more of the
               -----------------
following shall constitute an Event of Default hereunder:

               (a)  The Borrower shall fail to pay any principal on the Note
when due in accordance with the terms hereof.

               (b)  Any representation or warranty made or deemed made by the
Borrower herein or in the Loan Agreement, or which is contained in any
certificate, document or financial or other statement furnished at any time
under or in connection herewith or therewith shall prove to have been incorrect
in any material respect on or as of the date made or deemed made.

               (c)  The Borrower shall default in the observance or performance
of any material obligation, other than the obligation for payment of money
hereunder or under the Note, or any other agreement to which Lender and the
Borrower are parties, and such default shall continue unremedied for a period of
five (5) Business Days.

               (d)  The Borrower shall fail to pay Indebtedness exceeding
$250,000 in the aggregate when due to any Person, and such failure shall
continue beyond any applicable grace period, or any other event shall have
occurred such that as a result thereof the holders thereof shall have
accelerated or shall have the right (upon the giving of notice, the passage of

                                       2
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time, or both) to accelerate such Indebtedness, or any other event of default
shall have occurred, and shall have been caused by the Borrower, under any other
agreement binding upon it.

               (e)  (i) The Borrower shall commence any case, proceeding or
other action (A) under any existing or future law of any jurisdiction, domestic
or foreign, relating to bankruptcy, insolvency, reorganization or relief of
debtors, seeking to have an order for relief entered with respect to it, or
seeking to adjudicate it as bankrupt or insolvent, or seeking reorganization,
composition, extension or other relief with respect to its debts, or (B) seeking
appointment of a receiver, conservator or other similar official for all or any
substantial part of its assets, or the Borrower shall make a general assignment
for the benefit of its creditors; (ii) there shall be commenced against the
Borrower any case, proceeding or other action of a nature referred to in clause
(i) above which (A) results in the entry of an order for relief or any such
adjudication or appointment or (B) remains undismissed, undischarged, unstayed
or unbonded for a period of forty-five (45) days or (iii) there shall be
commenced against the Borrower any case, proceeding or other action seeking
issuance of a warrant of attachment, execution, distraint or similar process
against the Borrower.

               (f)  Any execution or attachment shall be levied against any
material properties of the Borrower, and such attachment shall not be set aside,
discharged or stayed within thirty (30) calendar days after the same shall have
been levied.

               (g)  Any money judgment, writ or warrant of attachment, or
similar process in excess of $250,000 in the aggregate shall be entered or filed
against the Borrower or any of its Subsidiaries and shall remain unpaid,
unvacated, unbonded and unstayed for a period of ten (10) days.

               (h)  The public announcement of a "going private" transaction
under Rule 13e-3 promulgated pursuant to the Exchange Act.

               (i)  The public announcement of a tender offer by the Company
under Rule 13e-4 promulgated pursuant to the Exchange Act.

          4.   Remedies Upon an Event of Default.  Upon the occurrence of any
               ---------------------------------
one or more of the Events of Default, all amounts then remaining unpaid on this
Note shall become, or may be declared to be, immediately due and payable.

          5.   Waiver.  The Borrower expressly waives diligence, presentment,
               ------
protest, demand and other notices of any kind.

          6.   Rank.  This Note shall rank senior to all equity and debt of the
               ----
Borrower, other than the Sands Debt and the Debentures.

          7.   Payment of Expenses.  The Borrower agrees to pay all costs and
               -------------------
expenses of collection, including, without limitation, reasonable attorney's
fees and expenses and court costs, incurred by the Lender in connection with the
collection or attempted collection of this Note. Any payments by the Borrower in
respect of amounts owed under this Note shall be applied in the following order
of priority (regardless of the purpose for which the Borrower may have
designated such payments): first, to the payment of all costs, expenses and
other amounts

                                       3
<PAGE>

(other than principal and interest) owed by the Borrower under this Note; next,
to the payment of accrued and unpaid interest under this Note; and next, to the
payment of the unpaid principal amount of this Note. In addition, the Borrower
agrees to reimburse TIC for its legal expenses relating to the negotiation and
execution of this Note, the ConTech Note, the Loan Agreement, and all other
documents in connection therewith up to $100,000. The Borrower shall make such
payment to TIC (or its designee) on the date hereof.

          8.   Amendments.  This Note may not be modified, amended, waived,
               ----------
extended, changed, discharged or terminated orally or by any act or failure to
act on the part of the Borrower or the Lender, but only by an agreement in
writing signed by the party against whom enforcement of any modification,
amendment, waiver, extension, change, discharge or termination is sought.

          9.   Governing Law.  This Note shall be governed by, and construed and
               -------------
interpreted in accordance with, the laws of the State of New York, without
regard to conflicts of laws.

          10.  SUBMISSION TO JURISDICTION; WAIVERS.  THE BORROWER IRREVOCABLY
               -----------------------------------
AND UNCONDITIONALLY: (A) SUBMITS FOR ITSELF AND ITS PROPERTY IN ANY LEGAL ACTION
OR PROCEEDING RELATING TO THIS NOTE OR ENFORCEMENT OF ANY JUDGEMENT IN RESPECT
THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE STATE AND FEDERAL
COURTS LOCATED IN NEW YORK COUNTY, NEW YORK; (B) CONSENTS THAT ANY SUCH ACTION
OR PROCEEDING MAY BE BROUGHT IN SUCH COURTS AND WAIVES ANY OBJECTION THAT IT MAY
NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH
COURT OR THAT SUCH ACTION OR PROCEEDING WAS BROUGHT IN AN INCONVENIENT COURT AND
AGREES NOT TO PLEAD OR CLAIM THE SAME; (C) AGREES THAT SERVICE OF PROCESS IN ANY
SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY MAILING A COPY THEREOF BY
REGISTERED OR CERTIFIED MAIL (OR ANY SUBSTANTIALLY SIMILAR FORM OF MAIL),
POSTAGE PREPAID, TO THE BORROWER AT ITS ADDRESS SET FORTH IN SECTION 8.1 OF THE
LOAN AGREEMENT OR AT SUCH OTHER ADDRESS OF WHICH THE LENDER SHALL HAVE BEEN
NOTIFIED PURSUANT THERETO; AND (D) AGREES THAT NOTHING HEREIN SHALL AFFECT THE
RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR SHALL
LIMIT THE RIGHT TO SUE IN ANY OTHER JURISDICTION.

          11.  WAIVER OF JURY TRIAL.  THE BORROWER HEREBY IRREVOCABLY AND
               --------------------
UNCONDITIONALLY WAIVES TRIAL BY JURY IN ANY LEGAL ACTIN OR PROCEEDING RELATING
TO THIS NOTE AND FOR ANY COUNTERCLAIM THEREIN.

                                       4
<PAGE>

                                        CONSTELLATION 3D TECHNOLOGY LIMITED

                                        By:
                                           -------------------------------------
                                           Name:  Eugene Levich
                                           Title: Director

                                       5

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