Blender Git Loki

Simplified render/preview settings for cache baking.

The previous way of selecting preview ("realtime") and render settings
on the cache library level was complicated and confusing. Now there are
just 2 buttons for baking either the preview or render level.
Technically the cache still works the same way, so a 3rd button could be
added for baking both passes into the same cache, should the need arise.

The preview cache now also uses the preview frame range, which should
help in quick testing of hair simulation settings. Render always uses
the scene frame range, like render buttons do.

For display in the viewport and rendering the cache will now use
whatever data is available in the archive. If the cache contains only
render data, the viewport will also draw full render data. Vice versa,
if the cache contains only preview data, this will also be used for
rendering.

Hair toggles for children and motion now are only used for the viewport
display. This simplifies the settings a lot and removes one potential
button to be overlooked.

Merge branch 'master' into alembic

Fix for cycles rendering of shortened hair curves.

The strands data can now contain more vertices than are supposed to be
rendered (if cutoff < numverts).

Support for cutoff parameters in Alembic files.

These are optional, so older alembic cache versions still work.

Take transformation of the duplicator object into accound for hair
cutting.

When using a dupli object from the same group as a target it is
sufficient to calculate the relative transform in the shared duplicator
local space. When using an external object though we have to transform
into world space first.

Fix for incorrect cutoff points with the haircut cache modifier.

Implemented hair cutting for cached strands, based on a cutoff parameter
for child hairs.

The algorithm works by finding the first intersection of each child
hair with the target mesh. The child hairs have to be deformed with
their parents first (this usually happens *after* modifiers).

Option for the haircut cache modifier to either use a scene object or
an "internal" object from the group.

New cache modifier "Haircut", for removing unwanted child hairs.

Initialize curve mappings once after creating, just to be sure.

Alembic: Update stubs file so building without alembic works fine

Use a flag to explicitly apply shape keys to either the goal positions
or the motion state.

Use correct blending weights for hair shapekey references.

Removed unused variable.

Use dedicated versions of shapekey eval functions for strands.

Strand shapekeys will be interpreted as delta keys without a basis,
since the basis would be animated and therefore useless for static keys.
To avoid complexity in the already overburdened shapekey functions and
to skip old legacy code, the strands shapekeys now have their own
functions.

Removed some useless old code.

Removed the complicated optional refdata handling from the generic
shape key eval function.

This now goes to a dedicated strands function which can be cleaned up
properly, all the old code can function as before.

Fixed shape key reference data usage, for applying shape keys on top
of an animated base.

This is necessary for strand shape keys. The basis of the data comes
from the cached animation or simulation results, i.e. we can't use the
fixed basis key or the result would always become static.

Apply strand shape keys to both the base strand coordinates and the
motion state.

This means shape keys work on the goal positions for hair as well as
the simulation results (hair motion).

If the simulation is created before shape keys are applied, the
resulting sim will be mixed with the shape keys, becoming more rigid
with increased shape weights.

OTOH the shape keys can also be applied to the animation result, before
doing hair simulation. In that case the shape will only affect the goal
positions and the bending shape of the hair, but the hair is otherwise
free to move.

Set the 'from' pointer in Key directly in the init method, so it works
with NULL pointers too.