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/device/device_optix.cpp b/intern/cycles/device/device_optix.cpp
index 1cc45983565..43b1fb30baf 100644
--- a/intern/cycles/device/device_optix.cpp
+++ b/intern/cycles/device/device_optix.cpp
@@ -1389,7 +1389,7 @@ class OptiXDevice : public CUDADevice {
           return false;
         }
       }
-      else if (geom->type == Geometry::MESH) {
+      else if (geom->type == Geometry::MESH || geom->type == Geometry::VOLUME) {
         // Build BLAS for triangle primitives
         Mesh *const mesh = static_cast<Mesh *const>(ob->geometry);
         if (mesh->num_triangles() == 0) {