Blender Git Loki

Cycles: Fix for transmissive microfacet sampling

This is an alternate fix for T40964 which resolves bad handling of
caustics reported in T45609.

There were too much transmission rays being discarded by the original
fix, which caused by caustic light being totally disabled. There is
still some room for investigation why exactly original paper didn't
work that well, could be caused by the way how the pdf is calculated.

In any case current results seems rather correct now.

Use polygon normals for sculpt drawing

Wasn't working correctly since using MLoopTri,
this is improved over 2.75 which only handled tris & quads.

Remove MFace use w/ softbody

Use looptri's for softbody face collision

Don't calculate tessface before sculpting

Docs: MLoopTri info and example usage

Replace MFace w/ vert-tri's for collision modifier

Note that the collision modifier doesn't have any use for Loop indices,
so to avoid duplicating the loop array too,
MVertTri has been added which simply stores vertex indices (runtime only).

Don't initialize CDDM with MFace from Meshes

Caused crash because MFace is no longer a layer which is added unless requested,
causing CDDM to have numTessFaceData nonzero, but mface set to NULL.

Cleanup: Remove unused variable in PathState.

Move tangents and baking to looptris:

Notes:

* Code in rendering and in game engine will still convert
tangents to a tessface representation. Added code that
takes care of tangent layer only, might be removed
when BGE and rendering goes full mlooptri mode.

* Baking should work discovered some dead code while
I was working on the patch, also tangents are broken
when baking from multires (also in master), but those
are separate issues that can be fixed later.

This should fix T45491 as well

CustomData: quiet error on 0 element copy

Fix T45577 tiled sculpting not working with brushes requiring a sculpt
plane.

Make sure sculpt plane is recalculated for every tiled dab.

Note this is not the optimum thing to do, we could cache the original
sculpt plane and reuse that, but this would require us to rearrange the
logic of tiled sculpting somewhat. This can be a TODO, but for now this
will fix the issue.

OpenSubdiv: Add CMake option to enable -Werror in subsurf code

OpenSubdiv: Remove debug-only leftover

Cleanup: safe-free macro for collision modifier

Use looptri for smoke bvhtree

Missed from D1424

error reordering args

Cycles: Fix issue in closure merge function.

* Did not check data2, this partially fixes T45583.
* Initialize data2 in some closures to avoid potential problems.

Differential Revision: https://developer.blender.org/D1436

Fix SCons path issue on Windows.

OpenSubdiv: Workaround for vertices which are adjacent to several manifold islands