Blender Git Loki

Make sure the mesh has a material assigned when entering texture paint
mode. This will prevent crashing. Thanks to Marc Dion for the report.

painstakingly merge with trunk -r60636

Slightly better calculation for overlap factor in paint stroke system,
it was being calculated from spacing multiplied by size instead of only
spacing. Now brush spacing should be scaled according to all factors
(pressure, size etc) by using a ratio factor between default and scaled
sizing.

merge with trunk -r60501

tiled textures did not support gradient colors.

Texture painting: Fix painting with size pressure sensitivity scales the
texture as well. Do not modify the brush size in texture painting,
instead cache the size in the paint structures. Projective painting
should work correctly now. 2D still has a swimmy effect which I have
isolated in partial brush image update (new coordinates seem to be OK)

merge with trunk 60449

Projection paint layers:

* Better naming for new layers
* Allow Custom Size for new layers

Adaptive fill works for float images too.

Modify fill tool to be adaptive. It uses a fill threshold to spread from
the mouse position outwards to colors similar to the initial one. I'm
not entirely sure about the threshold algorithm, but it is a solid base
that can be improved upon.

Only byte images working for now, float images coming next.

More UI cleanup for the fill tool, it doesn't support accumulation or
size.

Fix accumulation flag UI not appearing

Tidying options, line based strokes do not support stroke smoothing

Make fill tool listen to brush strength (Allows to quickly do semi-

Code reorganization:

* Move symmetry options to paint instead of Sculpt struct.
* Expose the symmetry options under Projective Paint panel (still
inactive)

merge with trunk -r 60261

Hook up custom kernel radius into projective texturing. Warning though,
in projective texturing bigger kernels are quite costly.

* Fix uninitialized variable in previous commit, made blur image float
on the canvas.

Hook custom blur radius and type into 2d painting. Really nice result :)

* UI options for configurable blur kernel: size, type (box, gaussian)
* added a function that calculates the blur kernel.

Still not hooked to the paint systems.

merge trunk -r 60160