Blender Git Loki

Volumes: cleaning / refactoring from code review

Fix Cycles standalone and tests build

Tests: add OpenVDB volume tests

Fix build with OpenVDB disabled

Merge branch 'master' into new-object-types

Volumes: add render settings for volume datablock

* Space: volume density and step size in object or world space
* Step Size: override automatic step size
* Clipping: values below this are ignored for tighter volume bounds

Cycles: change volume step size controls, auto adjust based on voxel size

By default it will now set the step size to the voxel size for smoke and
volume objects, and 1/10th the bounding box for procedural volume shaders.

New settings are:
* Scene render/preview step rate: to globally adjust detail and performance
* Material step rate: multiplied with auto detected per-object step size
* World step size: distance to steo for world shader

Differential Revision: https://developer.blender.org/D1777

Merge branch 'master' into new-object-types

Cleanup: process colorspace conversion with a 1D pixel array

No need to assume it's 2D or 3D.

Merge branch 'master' into new-object-types

Merge branch 'master' into HEAD

Cycles: load OpenVDB grids directly in Cycles (still as dense grid)

Merge branch 'master' into new-object-types

Fix link error when building without new object types

Merge branch 'master' into new-object-types

Volumes: use approximate transform for (unsupported) perspective grids

Rather than showing nothing at all.

Volumes: add option to display points in wireframe mode

Merge branch 'master' into HEAD

Cleanup: compiler warnings

Fix build error on Windows