Blender Git Loki

Replace usage of the procedural duplilist generation by cached duplilist.

Use a nested Object writer to store the Object ID blocks used by dupli
lists.

Removed unused code.

Cache reading functions for constructing a nested dupligroup list based
on Alembic cache data.

Include mesh writers in the cache writers list.

Removed current implementation of cache reading from various parts of
BKE (DerivedMesh, particles, cloth).

The new cache implementation will be used for constructing dupli data
instead, bypassing the complexities of the modifier stack.

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

Conflicts:
source/blender/blenkernel/intern/particle.c
source/blender/blenkernel/intern/particle_system.c

Fix for name collisions in compound properties when writing CustomData.

This is not clearly documented for Alembic, but apparently properties
inside compounds still need to be name uniquely for the whole object.
This is somewhat involved for Blender's CustomData, because we have
5 different customdata elements for meshes (vert, edge, face, poly,
loop) and each of these can have the same types and multiple layers of
the same type ...

Fix for particle pathcache caching: have to check the psys->renderdata
pointer to figure out if we are evaluating with render settings.

Fix for potential size issue: need 64 bits for CustomDataMask types.

Improved edge attribute caching.

Now edges should be fully restored from cache, fixing edge display.

Ugly hack for caching code to deal with quirky modifier stack behavior.

CustomData layers are pruned by the CDDM_copy function when they have
CD_FLAG_NOCOPY set. This is based on later modifiers in the stack, which
can specify that they require certain data layers - but the caching
modifier itself should store only what is needed by later modifiers.
It means we cannot easily keep a full copy of the DM in the cache
modifier to writing into caches later.

For now the hackish solution is to temporarily disable NOCOPY flags when
copying the DM. This is really not nice and needs a better solution.

Implementation of MDeformVert customdata layers in Alembic.

Initial code to support dupli group instancing and overrides through
Alembic caches.

This creates representations (Abc::Object) for Blender Object and Group
datablocks in the Alembic files and uses Alembic instancing to define
the dupligroup hierarchy. This leads to a relatively flat hierarchy in
Alembic files:

Top -> Object/Group -> DerivedMesh/Particles/Hair/Cloth/Smoke/...

The dupligroup structure can not be represented by a hierarchical
structure such as the Alembic object nesting, because of the
many-to-many relationship between objects and groups (a group can
contain multiple objects, multiple objects can instance the same group).
Instead we use the instancing feature of Alembic to represent
dupligroups. This is created in 2 stages to ensure all the main ID
blocks have been serialized before creating references.

Nicer error handling for unimplemented CustomData layer types.

Instead of failing an assert, simply print an error message and return
gracefully. We don't want Blender crashing because of this.

Nicer info printing support for instances in Alembic files.

This now avoids repetition of internal instance structure.

Fix for some archive checks to make sure we don't access invalid data.

This can happen if the archive file cannot be opened for some reason.

Fix for Alembic info printer printing to std::cout instead of the
internal stringstream.

Fix for invalid ob->data access in case non-mesh objects are in the
cached group.

Omit hair path lengths for anything but the first sample.

We can safely assume that paths don't change their lengths. This might
safe some cache space.

Fix for cache item filtering: items can be part of the cache library
but disabled, in that case hide them as well.