Blender Git Loki

Merge branch 'master' into HMD_viewport

Base list refcount with Bastien Montagne

Cycles: Avoid divisions by zero in volume sampling code

Was giving huge artifacts in the barber shop file here in the studio,

Maybe not fully optimal solution, but committing it for now to have
closer look later.

Fix reading collection objects and small refactors here and there

collections.objects.link()

Render API: Use RE_InitState for postprocessing operator

Cycles: Improve tile highlighting when denoising after rendering

Remove unused vector icons from RNA

Cycles: Sync new filter settings when using denoising after rendering

Use BLI_genericNodeN

Cycles: Include the new headers for CUDA in CMake

Cycles: Fix selective denoising

Fix prefs UI when built w/o Cycles

Give info on why "Use Device IPD" is disabled

Also renamed RNA properties and removed unneeded update function.

Layers doversion: use 1, 2, 3, ... for new collections

RNA: layer.collections[2].objects

This does not include objects from nested collections.
Missing bits: objects.link, objects.unlink

Fix mem leak for recursive collections and get layer.bases and objects
to work

(also some base util functions, and a refactor to unify the functions
for nested and non nested collections)

Couple of fix for case no device is available/active

Fixes:
* HMD device option using invalid value
* HMD view drawing on-screen info and using wrong matrices
* Hardly usable 3D view due to projection and modelview matrix being unit matrices
All issues where only visible when the HMD device option is set to 'None'

Fixes for build options

Removed the deprecated OpenVDB shader node for direct loading of .vdb files.

This node was already disabled. All vdb data should eventually be loaded
through the Cycles sync procedure as object data.

Specialized nodes for accessing voxel data may eventually be added again
for convenience, but these would just be advanced attribute nodes.