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, 2 insertions, 2 deletions

diff --git a/intern/cycles/bvh/bvh_build.cpp b/intern/cycles/bvh/bvh_build.cpp
index 86ab7b00815..360cac59e9b 100644
--- a/intern/cycles/bvh/bvh_build.cpp
+++ b/intern/cycles/bvh/bvh_build.cpp
@@ -270,7 +270,7 @@ void BVHBuild::add_reference_curves(BoundBox &root, BoundBox &center, Hair *hair
 
 void BVHBuild::add_reference_geometry(BoundBox &root, BoundBox &center, Geometry *geom, int i)
 {
-  if (geom->type == Geometry::MESH) {
+  if (geom->type == Geometry::MESH || geom->type == Geometry::VOLUME) {
     Mesh *mesh = static_cast<Mesh *>(geom);
     add_reference_triangles(root, center, mesh, i);
   }
@@ -299,7 +299,7 @@ static size_t count_curve_segments(Hair *hair)
 
 static size_t count_primitives(Geometry *geom)
 {
-  if (geom->type == Geometry::MESH) {
+  if (geom->type == Geometry::MESH || geom->type == Geometry::VOLUME) {
     Mesh *mesh = static_cast<Mesh *>(geom);
     return mesh->num_triangles();
   }