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Fix T78666: Cycles non-uniformly scaled hair renders wrong for static objects 

Don't apply the matrix transform optimization in this case, curve points and
radius can't represent non-uniform scale the way is possible with triangle
meshes and vertices.

This would cause abrupt change if objects had e.g. motion blur in one frame
and not in the next.
This commit is contained in:
Brecht Van Lommel 2020-07-07 14:47:59 +02:00
parent 98bee41c8a
commit a394aac8b4
Notes: blender-bot 2024-05-02 21:33:31 +02:00 
Referenced by issue #78666, Non-Uniform scaling of hair emitters results in incorrect Cycles renders
1 changed files with 6 additions and 0 deletions
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6
intern/cycles/render/object.cpp
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@ -823,6 +823,12 @@ void ObjectManager::apply_static_transforms(DeviceScene *dscene, Scene *scene, P
Mesh *mesh = static_cast<Mesh *>(geom);
apply = apply && mesh->subdivision_type == Mesh::SUBDIVISION_NONE;
}
else if (geom->type == Geometry::HAIR) {
/* Can't apply non-uniform scale to curves, this can't be represented by
* control points and radius alone. */
float scale;
apply = apply && transform_uniform_scale(object->tfm, scale);
}
if (apply) {
if (!(motion_blur && object->use_motion())) {