Blender Git Loki

Merge branch 'master' into alembic_pointcache

Optimization for particle path cache reading.

The pathcache data structure is really not very good. Using pointers to
small per-particle arrays leads to fragmentation and unnecessary pointer
indirection. With the new optimizations walking over this buffer is a
bit faster, but still not close to how fast Alembic could deliver the
data.

Sanity checks for Alembic archive validity to avoid crashes when trying
an invalid file operation (e.g. overwriting files).

Alembic caching support for particle paths.

This hooks into the particle path update functions and reads cache data
if available instead of constructing expensive child paths every time.

Currently the cache grows quite rapidly due to lack of optimized sample
storage: constant values such as numer of segments, times, colors etc
only need to be stored in the first sample. "Velocities" (actually
position deltas) could also be calculated on-the-fly, which is
relatively cheap compared to full child calculation. In any case, disk
space it cheap ...

Fix for constructing cache reader/writer based on RNA pointer.

Because of the awkward internal cloth modifier inside the particle
system, we have to look at the psys to determine if we actually want to
use the particle system cache or the internal cloth modifier cache.

Sanity NULL check when freeing caches.

Merge branch 'master' into alembic_pointcache

Use a default handler for printing Alembic errors in case no explicit
error handler is used, to avoid silent failure.

Sanity check when trying to write cloth cache, the cloth data may not
actually exist.

Use a realistic time scale for cloth sim.

Return a boolean value indicating success when getting the frame range
of a cache.

Also the default cache range is return in case no archive exists.

Removed unused code.

Use new point cache API in the cloth modifier.

Currently broken.

Cleanup: replaced the convoluted BKE_ptcache_id_clear function with
specific variants for clearing and truncating the cache frame range.

CLEAR_BEFORE is not used anywhere (it doesn't make much sense anyway).
CLEAR_FRAME is just a special version for deleting a single frame and
only used internally prior to replacing a cache frame.

Merge branch 'master' into alembic_pointcache

Conflicts:
source/blender/blenkernel/intern/cloth.c

Removed unused function.

Read/Write implementation for cloth/hair data in alembic files.

This data is very simple, just deform positions, velocities and goal
positions. Future cloth might become more complex, but for now a plain
Abc::Point schema is sufficient.

Store a custom context pointer "cache_user" for point cache operators,
so that all point caches can use the export feature.

This was enabled only for particles. There is a lot of weird unexplained
code with special cases all over the place - unified point cache should
be possible in the end, but currently it's still a mess.

Separation of the main point cache API from the Alembic implementation.

Even though we probably will use only the Alembic backend in the
foreseeable future, it is still good design to have a bit of abstraction
in this place and not directly call Alembic functions.

Merge branch 'master' into alembic_pointcache

Conflicts:
source/blender/blenloader/intern/versioning_270.c