Blender Git Loki

Merge branch 'master' into soc-2020-io-performance

Merge branch 'master' into soc-2020-io-performance

Create test OBJ files in temporary place.

Fix test to not use Ankit's directory name.

Merge branch 'master' into soc-2020-io-performance

Progress towards making material output the same as the python exporter.

The python exporter was stricter about what Principled BSDF node it
would use -- it only wanted one directly attached to the Material Output.
Also, the Python exporter sets the ambient to (1,1,1) if no reflections.
And there was a mistake in how the C++ exporter set the illumination model.

Also printed out the components in the same order as the python one,
for easier comparison.

Fixed problem of repeated same materials output in MTL file.

The code was writing out all of the materials for each object.
Refactored so that the materials for all objects are gathered
together, deduping, and writing out at the end of a frame.

Fix a bad default assignment and an unused parameter.

Merge branch 'master' into soc-2020-io-performance

Put the blender file basename in comment in the header of the .mtl file.

Merge branch 'master' into soc-2020-io-performance

Fixed up the TODOs re materials left when making it compile again.

Also, fixed a place where a newline belonged in material output.

Blender source doesn't yet permit modernize-use-override

Current blender source hasn't modernized all string literals.

Merge branch 'master' into soc-2020-io-performance

Get branch into compling state again.

There are some changes in Materials in the exporter that make compiling
the importer fail. I fixed one and several others are just ifdef'd out
for now so that the branch compiles. TODO to fix the rest.

Merge branch 'master' into soc-2020-io-performance

Cleanup

Writer: some tests

Cleanup: fix typos