Cycles : add a Volume Geometry Node

This splits the volume related data (properties for rendering and attributes) of the Mesh node
into a new `Volume` node type.

This `Volume` node derives from the `Mesh` class since we generate a mesh for the bounds of the
volume, as such we can safely work on `Volumes` as if they were `Meshes`, e.g. for BVH creation.
However such code should still check for the geometry type of the object to be `MESH` or `VOLUME`
which may be bug prone if this is forgotten.

This is part of T79131.

Reviewed By: brecht

Maniphest Tasks: T79131

Differential Revision: https://developer.blender.org/D8538

1 files changed, 1 insertions, 1 deletions

diff --git a/intern/cycles/bvh/bvh_optix.cpp b/intern/cycles/bvh/bvh_optix.cpp
index ccb7ae08625..0527c0eeda8 100644
--- a/intern/cycles/bvh/bvh_optix.cpp
+++ b/intern/cycles/bvh/bvh_optix.cpp
@@ -95,7 +95,7 @@ void BVHOptiX::pack_blas()
       }
     }
   }
-  else if (geom->type == Geometry::MESH) {
+  else if (geom->type == Geometry::MESH || geom->type == Geometry::VOLUME) {
     Mesh *const mesh = static_cast<Mesh *const>(geom);
     if (mesh->num_triangles() > 0) {
       const size_t num_triangles = mesh->num_triangles();