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, 3 insertions, 1 deletions

diff --git a/intern/cycles/render/geometry.h b/intern/cycles/render/geometry.h
index b0284304843..bcadb3a8051 100644
--- a/intern/cycles/render/geometry.h
+++ b/intern/cycles/render/geometry.h
@@ -40,6 +40,7 @@ class RenderStats;
 class Scene;
 class SceneParams;
 class Shader;
+class Volume;
 
 /* Geometry
  *
@@ -52,6 +53,7 @@ class Geometry : public Node {
   enum Type {
     MESH,
     HAIR,
+    VOLUME,
   };
 
   Type type;
@@ -166,7 +168,7 @@ class GeometryManager {
  protected:
   bool displace(Device *device, DeviceScene *dscene, Scene *scene, Mesh *mesh, Progress &progress);
 
-  void create_volume_mesh(Mesh *mesh, Progress &progress);
+  void create_volume_mesh(Volume *volume, Progress &progress);
 
   /* Attributes */
   void update_osl_attributes(Device *device,