Blender Git Loki

Fix silly mistake in nearestVert

Change angle function calls in sdef

Change angle function call in 3d to 2d mapping function

Split interp_weights_face_v3 into specific functions for tris and quads

Remove custom weight interp func in favor of Blender's built-in implementation

Fix VS 2015 issue (change isnanf to isnan)

Fix 2d mapping function's name

Replace "cent" functions from math_geom with "mid" ones from math_vector

Constify some stuff (for clarity and correctness)

Silly const mistake (missed in refactor...)

Implement target poly influence interpolation

Add 3d to 2d plane mapping functions to math lib

Fix out of bounds memory access in interp_weights_face_v3

interp_weights_face_v3 required a length four array for weights even when
calculating weights for a tri, otherwise, it would access unkown memory.
This fix allows a weight array of size three to be passed when only
calculating tri weights.

Initial Surface Deform Modifier implementation

Add cent_poly_v3 function

Add is_poly_convex_v3 function

Fix (unreported) looptri array not being recalculated in ccgDM and emDM

In ccgDM and emDM, looptri array recalculation was being handled
directly by `*DM_getLoopTriArray` (`getLoopTriArray` callback), while
`*DM_recalcLoopTri` (`recalcLoopTri` callback) was doing nothing.

This results in the array not being recalculated when other functions
that depend on the array data are called. These functions, such as
`getNumLoopTris`, call `recalcLoopTri` to ensure the data is up to date,
but in the case of CCGDerivedMesh that was doing nothing.

This moves all the recalculation code to `ccgDM_recalcLoopTri` and makes
`ccgDM_getLoopTriArray` call that.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D2375