Solidify Modifier

The Solidify modifier takes the surface of any mesh and adds depth, thickness to it.



The Solidify modifier.

The depth to be solidified.
A value between (-1 to 1) to locate the solidified output inside or outside the original mesh. Set to 0.0, the solidified output will be centered on the original mesh.

A value between (0 to 2) to clamp offsets to avoid self-intersection.


Clamp Offset.

Vertex Group

Only vertices in this group are solidified. Their weights are multiplied by the thickness, so vertices with lower weights will be less thick.

Reverses the vertex group, so that only vertices which are not in the vertex group are solidified.

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.

These options are intended for usage with the Subdivision Surface modifier.


Rim and edges. In this example, the object was assigned a second material used to color the rim red.

Set a crease to the inner edges.
Set a crease to the outer edges.
Set a crease to the rim.
Flip Normals
Reverse the normals of all geometry (both the inner and outer surfaces).
Even Thickness
Maintain thickness by adjusting for sharp corners. Sometimes improves quality but also increases computation time.
High Quality Normals
Normals are calculated to produce a more even thickness. Sometimes improves quality but also increases computation time.
Fill Rim
Fills the gap between the inner and outer edges.
Only Rim
Will not extrude surfaces parallel to the original one, but instead will only generate the perpendicular rim.


Fill Rim and Only Rim only make a difference on non-manifold objects, since the rims are generated from the borders of the original geometry.

Material Index Offset

Choose a different material 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.

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


The modifier thickness is calculated using local vertex coordinates. If the object has non-uniform scale, the thickness will vary on different sides of the object.

To fix this, either apply or clear the scale.

Known Limitations

Even Thickness

Solidify thickness is an approximation. While Even Thickness and High Quality Normals should yield good results, the final wall thickness is not guaranteed and may vary depending on the mesh topology.

In order to maintain precise wall thickness in every case, we would need to add/remove faces on the offset shell, something this modifier does not do since this would add a lot of complexity and slow it down.