user: Describe Options from the Blender manual or Python API, including usage steps and snippets.

assistant: |  |  |
| --- | --- |
| ../../../_images/modeling_modifiers_generate_solidify_panel-simple.png   The Solidify modifier in simple mode. | ../../../_images/modeling_modifiers_generate_solidify_panel-complex.png   The Solidify modifier in complex mode. |

Mode
:   Simple:
    :   This is the default solidify algorithm, which simply extrudes the geometry.
        This algorithm does not work on geometry where edges have more than two adjacent faces.

    Complex:
    :   This is a solidify algorithm which can handle every geometric situation
        to guarantee a manifold output geometry. This algorithm is able to
        solidify shapes like Möbius strips, Klein bottles, architectural wall layouts
        and many more which the *Simple Mode* isn’t able to do.
        If the special cases are not present it is recommended to choose *Simple*
        because the extra logic makes this algorithm much slower.

Thickness Mode Complex Mode
:   Choose the kind of thickness handling (thickness solver).

    [image reference removed]

    Different thickness options on a non-manifold mesh.

    Fixed:
    :   This is similar to *Simple Mode* without *Even Thickness*.
        The new vertices are always in a fixed distance to the old ones.

    Even:
    :   This is similar to *Simple Mode* with *Even Thickness* and *High Quality Normals*.
        It adjusts for sharp corners, but may not always work when more than three faces come together.

    Constraints:
    :   This is a more advanced model to try to always get the optimal thickness everywhere.
        For up to three faces it is always guaranteed to find an optimal solution.

Boundary Complex Mode
:   Choose the kind of boundary that suits the model the most.

    [image reference removed]

    Different boundary options with a matCap.

    None:
    :   No boundary fix is applied. Results are stable.

    Round:
    :   Adjusts the boundary for an opening to face inwards (like a hole in an egg).

    Flat:
    :   Adjusts the boundary of a planar opening to be a flat (like a cut sphere).

Thickness
:   The depth to be solidified.

Offset
:   A value between (-1 to 1) to locate the solidified output inside or outside the original mesh.
    The inside and outside is determined by the face normals.
    Set to 0.0, the solidified output will be centered on the original mesh.

Even Thickness Simple Mode
:   Maintain thickness by adjusting for sharp corners.
    Sometimes improves quality but also increases computation time.

Merge Threshold Complex Mode
:   Distance within which degenerated geometry is merged.

Rim – Fill
:   Creates edge loops and faces between the inner and outer surfaces on face edges (slow, disable when not needed).

Only Rim
:   - *Simple Mode*: Only leaves the extruded surface and the generated perpendicular rim.
    - *Complex Mode*: Only leaves the generated perpendicular rim.

Vertex Group
:   The weights of the selected vertex group are multiplied onto the *Thickness*,
    so vertices with lower weights will be less thick. The vertices which are not part
    of the vertex group will be used as if their weight was zero.

    Invert
    :   Reverses the vertex group weights, so that the used weight is one minus the actual weight.

Factor
:   How much the vertex weights are taken into account.

    - On 0.0 , vertices with zero weight will have no thickness at all.
    - On 0.5 , vertices with zero weight will be half as thick as those with full weight.
    - On 1.0 , the weights are ignored and the *Thickness* value is used for every vertex.

Flat Faces Complex Mode
:   Use the minimal vertex weight assigned to the vertices of a face to make sure that
    new faces stay parallel to their original ones. This is slow, so disable it when it is not needed.

### Normals

Flip Normals
:   Reverse the normals of all geometry (both the inner and outer surfaces).

High Quality Normals Simple Mode
:   Normals are calculated to produce a more even thickness.
    Sometimes improves quality but also increases computation time.

### Materials

Material Offset
:   Choose a different material slot index to use for the new geometry.
    This is applied as an offset from the original material of the face from which it was solidified.

    - A value of 0 means it will use the same material.
    - A value of 1 means it will use the material immediately below the original material.
    - A value of -2 means the material two positions above the original material will be used.

    These are clamped to the top-most and bottom-most material slots.

Rim
:   Similarly, you can give another material to the rim faces.

### Edge Data

Inner Simple Mode
:   Set a [crease](../../meshes/editing/mesh/transform/basic.xhtml#modeling-edges-crease-subdivision) to the inner edges.

Outer Simple Mode
:   Set a [crease](../../meshes/editing/mesh/transform/basic.xhtml#modeling-edges-crease-subdivision) to the outer edges.

Rim Simple Mode
:   Set a [crease](../../meshes/editing/mesh/transform/basic.xhtml#modeling-edges-crease-subdivision) to the rim.

Bevel Convex
:   Edge [bevel weight](../../meshes/editing/mesh/transform/basic.xhtml#modeling-edges-bevel-weight) to be added to outside edges.

[image reference removed]

Edges which will get creases marked.

### Thickness Clamp

Clamp
:   A value between (0 to 2) to clamp offsets to avoid self-intersection.
    The amount is determined by the length of the shortest adjacent edge.

    [image reference removed]

    Clamp Offset.

Angle Clamp
:   If enabled clamping will also consider angles in the geometry, not only lengths.

### Output Vertex Groups

Shell
:   Vertex group that the generated shell geometry will be weighted to.
    This allows you to use other modifiers to only affect the shell geometry
    by using that modifier’s vertex group influence control.

Rim
:   Same as *Shell Vertex Group*, but for the generated rim geometry.