Blender Git Loki

Use the new hair thickness render settings in Cycles.

Moved hair render settings into own struct and added strand thickness
parameters.

UI cleanup for hair: Moved settings into the physics button tab and
enabled cycles curve render settings.

Fix for uninitialized frame information in the hair render iterator.

Merge branch 'master' into terrible_consequencer

Implement motion updates for hair curves.

Made the hair modifier into a nominal "deform only" modifier, to get
cycles to recognize it as a motion blur source.

Very basic Cycles export of hair data.

Only the simplest curve mode is currently implemented.

Expose the hair render data via an emitter in the RNA for cycles.

The way this has to be constructed is quite ugly atm, due to limited
support for transient data such as iterators in the RNA. The alternative
would be to cache the hair data as a whole, which means allocating and
copying lots of memory. Eventually it would be nice to support this sort
of think in the RNA API ...

Removed unused "drawdata" buffer pointer from hair DNA, drawing code
uses OpenGL buffers instead.

Use a larger OpenGL buffer for optimized hair drawing.

The size of 1024 hairs is quite arbitrary, we might want to chose a max.
hair count based on the total number of steps/draw elements instead.

Added back child hair rendering and random offsets.

Fix for hair render iterator precache function, was using the wrong
variable ...

Moved child hair randomization into the hair render iterator and added
hair frame caching.

Added a HairRenderIterator for consistently generating draw and render
data from a hair system.

This replaces the current draw data generation and greatly simplifies
stepping through hair data, so that different render engines can easily
implement hair rendering consistently without caching large amounts of
data and with consistent results.

Merge branch 'master' into hair_system

Very basic random distribution of render hairs.

Render hairs are grouped around a simulated hair in some way. Currently
this is a plain -1..1 box, but should probably be a
gaussian distribution.

Buffered render hair drawing.

Currently all render hairs are drawn in the same place as the simulation
hair. OpenGL buffers are used for efficiency, which gives decent
performance even for many render hairs.

"Render" draw mode for hair, currently just drawing the coordinate
frames.

The average hair segment rest length is now calculated in advance in the
DNA data, so the drawing/rendering can use it for smoothing as well.

Added regular display options for hair systems.

Only has a mode setting so far, which defines the overall style of
display.