Blender Git Loki

New OB_GROOM type for hair editing objects.

Use material slot index instead of a direct Material pointer.

A Material pointer would be a nicer way to assign a hair material,
but unfortunately that does not work well with the context-based material
lookup of the node editor. There is no selection of an "active" modifier,
so the node editor will never display the material (unless it is placed
into a material stack as well).

Material pointer in hair systems.

Simplified API for generating hair follicles with a fixed max count.

The final count is inversely proportional to the min_distance, so using that
as a user variable is difficult to control. Instead we just use the overall
count as the single variable now.

The actual final count will be less than this maximum count, because the
theoretical limit is never reached in practice. The min. distance could also
be stored as a result of the hair generation as feedback for the user.

Merge branch 'blender2.8' into hair_guides

Fix strand vertex init loop, use correct stop index.

Need to call the subdiv function also for subdiv==0 to initialize vert positions.

Extend the fur generate modifier to also create guide curves.

More meaningful flag names for hair system changes.

Remove unused code, this has been replaced since.

Fix for overflow of cell_index in the Poisson disk sample generator.

Using a single uint as combined cell index only leaves ~10 bits per
coordinate axis, which quickly leads to overflow for higher densities.
Now use 3 ints so that the sampling grid can have sufficiently small
cells.

Additional pass in object mode for drawing hair follicles and guide curves.

Merge branch 'blender2.8' into hair_guides

Fix memleak from unfreed local array.

Struct for hair draw settings.

This is outside of the hair system itself since it only affects drawing.

Operator for generating hair follicles of the fur modifier.

Fix mesh sample inner loop for poisson disk generator, returned false always.

Follicle generation function for hair systems.

Rename "Hair" modifier to "Fur" modifier.

This will be a simple testbed for generating hair geometry.

The plan here is to use different modifiers for different editing methods
for hair. Each of these will use a HairSystem instance, but vary
in the editable data used to generate guide curves. The hair system
underneath is agnostic to the editing method used.

Remove the guide_object pointer from HairSystem.

Scalp mesh now is passed explicitly to the hair API functions again.

The idea is that hair systems can be created in any object and use
another object as the scalp. Sharing the same hair pattern should be
implemented at a later time, pending a good design for assigning
follicles to specific hair systems.