Blender Git Loki

Nicer vector math for mouse coordinates.

Simplified first version of the hair stroke combing functionality.

Stroke tools will be categorized by the hair elements they operate on:
vertices, segments or strands (roots). In addition to that a filter
function defines the influence of the brush. This should be defined by
the other brush settings and be largely independent of the main tool
mode.

Enforce hair constraints (constant segment length) after applying a tool.

Currently uses the same approach as old particle edit mode (rescale
hair segments from the root on). A more sophisticated approach using
least-square error minimization of the displacement could yield better
results.

Lots of small fixes for paint system quirks to make hair brushes work
in the UI.

Conflicts:
release/scripts/startup/bl_ui/space_view3d.py
source/blender/editors/transform/manipulator_widget.c

Define hair edit settings and brush types in the RNA, similar to paint
and sculpt settings.

Conflicts:
source/blender/makesdna/DNA_brush_types.h

Fix for GL buffer size for edges, needs to 2x for two vertex indices.

Revert previous hair edit operator scaffolding and port over the old
operator for strokes instead.

The paint system is much too complicated and does not add any real
advantage at this point.

Calculate some basic info about mouse strokes and context and pass it
on to a general hair tool function.

Apply the hair matrices when converting from particle keys to bmesh,
so the edit data is consistently in object space.

New image file icons for hair brush tools and an according tool enum in
the Brush RNA.

Copied high-level operator code from the paint/sculpt system as a basis
for brush-stroke operators in hair edit mode.

Hopefully this can help avoid some redundant code and ensure consistent
keymapping etc.

Missing bmesh include folder for hair editor in scons.

New drawing code for hair edit mode.

Conflicts:
source/blender/editors/space_view3d/drawobject.c
source/blender/editors/space_view3d/view3d_intern.h

Removed deprecated code.

Free strand edit memory after use.

Store the hair key weight in edit mode.

Currently particles only have a single weight value, controlling
pinning in the simulation (for root and virtual root verts) and goal
force scaling. This will be replaced by a full vertex group weight
system eventually.

CustomData layer for storing hair root locations as MSurfaceSamples.

This requires converting the old messy particle num/num_dmcache/fuv/foffset
data into the new mesh samples, which can potentially introduce floating
point errors and inaccuracies due to lack of face index mapping in the
new system. However, in any well-constructed particle system the hair
roots should be nearest to their num face, so mapping would be accurate
enough. If necessary face index data could be added to samples as a
legacy code hack, but probably it's best to eventually replace the
hair system as a whole anyway.

Fix for verts-of-strand iterator: This requires a second pointer in
addition to the edge, otherwise the last point is omitted.

First customdata layer for particle mass.

This is more for testing purposes, since currently there is only a
single mass property for the psys as a whole. This should change in the
future though, to allow variable mass per strand or vertex.

Conflicts:
source/blender/bmesh/intern/bmesh_interp.c

Fix for verts-of-strand iterator: After last edge step has to set the
edge to NULL to avoid infinite looping over the same edge (1-elem disk).