Blender Git Loki

Cycles: Move collaborative division into the kernel

Cycles: Experimental collaborative denoising

Right now tile borders are very visible, but that'll be fixed!

Cycles: Implement SSE4.1-vectorized NLM weights

Cycles: Fix kernel C++ files

Cycles: Fix a compiler warning

Cycles: Support denoising weighting adjustment

Cycles: Allow to use the NLM-weighted first-order regression filtering

Fix voxel attribute sampling position when using VDB grids.

OpenVDB handles inverse transform from object to grid space internally.

Indication if to use fresnel is now handled via the type of the BSDF.

Better roughness remapping for thin surface specular refractions.

Remove scene level HMDVIEW_SESSION_RUNNING flag

Also separated HMD view drawing from stereo3d drawing some more.

Merge branch 'master' into HMD_viewport

Conflicts:
source/blender/blenloader/intern/versioning_270.c
source/blender/editors/interface/resources.c

moved clean up and copy functions to pre/post step

added pre and post step functions

Implemented the specular transmission part of the thin surface
approximation.

Use new 'copy_from_render()' Image func to avoid saving previews render on disk and then reloading.

Merge branch 'multi_previews_id' into temp-sybren-poselib

Add copy_from_render to Image RNA API, allows to get 'real' usable image out of render_result one.

Update code for latest multi_preview changes.

Implemented the thin surface diffuse part.