Blender Git Loki

Ensure paths handed to Alembic are absolute.

Cleaup: de-duplicate exception safety code.

Add velocites for liquid meshes to the OPolyMeshSchema sample by
default, instead of using a arbitray property.

Cleanup: comments.

Add support for reading normals.

Also rewrite the normals write code, and add utility functions for Y-up
<-> Z-up conversion.

Merge branch 'master' into alembic_basic_io

Also check for animated UVs to determine if a mesh object has constant
data or not.

Remove bogus assert check.

Fix crash dereferencing nullptr.

Add support to read and write multiple UV maps.

Whilst Alembic support only one UV layer per mesh, there is a convention
to add multiple UV layers as arbitrary geometry parameter for a given
mesh, so we use it to write all the UV layers to the Alembic files. Only
extra UVs in archives from external software which follow this
convention will be imported.

Add support to stream UVs.

Fix compile error on Windows.

Merge branch 'master' into alembic_basic_io

Determine programatically whether or not an imported alembic archive is
part of sequence of files.

This removes the checkbox in the importer's UI, and also allows to set
the scene start and end frames based on the sequence length if desired.

Cleanup: move some utility methods out of the AbcExporter class.

Fix for objects not being written when exporting a flattened hierarchy.

Avoid tryijng to open files that do not exist.

Fix crash dereferncing null pointer.

Not sure this is the right fix, jugding from the area of code, either it
is wrong fix or the bug was never triggered.

Fix for accumulated camera specific transformations in a camera
hierarchy.

Only apply the transform to the root camera.

Merge branch 'master' into alembic_basic_io