Blender Git Commits

Remove deprecated UI code for the hair modifier.

Fix null pointer reads when there are no hair follicles (which is allowed).

Parent indices and weights for hair follicles and a binding function.

Fix merge errors

The ruler was using old grease pencil structure and palettes.

This need more attention in the future.

Merge branch 'blender2.8' into greasepencil-object

WIP: Smooth Thickness and Strength

This mooth the thickness of the strokes using points before and after. The same for strength (alpha)

Some cleanup too.

Add fields for curve storage in hair systems and use it in draw code.

fix for particle and mesh scaling

re-enabled bubble rise factor and some small snd particles fixes

Cycles: Speed up split kernel builds by using split direct_emission functions

This removes the indirect call to `svm_eval_nodes` from the
`kernel_direct_lighting` kernel, and speeds up kernel build times
by 4-5 seconds. Render time is slower by ~1%. It should be possible
to apply this technique to other areas of the kernel to get even
better build times.

Note: this breaks branched path and shadow catcher in the split
kernel. Should be an easy fix, will do later.

Cycles: Split apart direct_emission around shader_eval

Cycles: Split direct_emissive_eval around shader_eval

Cycles: Move ShaderEvalTask to kernel_types.h for use outside of split kernel

Also make usage slightly more generic.

Implementation for BKE_hair_get_scalp.

Cycles: Minor reworking of shader eval functions

Merges `shader_eval_surface` and `shader_eval_background` into the new
`shader_eval`. Also makes `kernel_shader_eval` of the split kernel
more generic. This will be used to split `svm_eval_nodes` out of
as many functions as possible so that there is only one call to this
function (or as close as we can get to that).

Fix error in previous commits

WIP: Readjust smooth thickness weights

WIP: Readjust weight for stabilize

WIP: First test for smooth thickness

WIP: More work to get better drawing feeling

Thre was some problems in previous commits