Cycles: Expose volume voxel data interpolation to the interface

It is per-material setting which could be found under the Volume settings
in the material and world context buttons.

There could still be some code-wise improvements, like using variable-size
macro for interp3d instead of having interp3d_ex to which you can pass the
interpolation method.

1 files changed, 2 insertions, 0 deletions

diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index 8743aa445be..6a08b47b01f 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -936,6 +936,7 @@ class CyclesWorld_PT_settings(CyclesButtonsPanel, Panel):
         sub = col.column()
         sub.active = use_cpu(context)
         sub.prop(cworld, "volume_sampling", text="")
+        sub.prop(cworld, "volume_interpolation", text="")
         col.prop(cworld, "homogeneous_volume", text="Homogeneous")
 
 
@@ -1040,6 +1041,7 @@ class CyclesMaterial_PT_settings(CyclesButtonsPanel, Panel):
         sub = col.column()
         sub.active = use_cpu(context)
         sub.prop(cmat, "volume_sampling", text="")
+        col.prop(cmat, "volume_interpolation", text="")
         col.prop(cmat, "homogeneous_volume", text="Homogeneous")