fix: (unreported) When converting nurbs or curves to Mesh the generated UVMap is now named 'UVMap'

fix: Removed Debug statement from Collada CMakeLists. cmake now silently determines which collada library version it uses

cleanup: collada: removed unused public class variable

Incompatible usage of the Collada transparency value

Some external tools seem to have issues with the definition
of Collada <transparency> - a float value in range (0,1).
However it is possible to use the <transparent> color as a container
for the <transparency> value. This seems to be a more reliable
method to export transparency values from Blender PBSDF Shaders.

The relevant documentation is in the collada 1.14 reference manual,
page 7-5 about the usage of transparent and transparency.

This fix makes export and import of the <transparency>
and <transparent> values more convenient and more reliable.

Reviewers: brecht, jesterking

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5305

fix: unreported: Collada using incompatible Enumeration types for compare

Incompatible usage of the Collada transparency value

Some external tools seem to have issues with the definition
of Collada <transparency> - a float value in range (0,1).
However it is possible to use the <transparent> color as a container
for the <transparency> value. This seems to be a more reliable
method to export transparency values from Blender PBSDF Shaders.

The relevant documentation is in the collada 1.14 reference manual,
page 7-5 about the usage of transparent and transparency.

This fix makes export and import of the <transparency>
and <transparent> values more convenient and more reliable.

Reviewers: brecht, jesterking

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5305

fix unreported: typo in python documentation

Fix as approved by dr.sybren in blender chat

fix T66899: Collada: Shininess/Reflectivity not handled correct

Fixed: The Collada Exporter only supports export of
Lambert Shaders. But Shininess is not supported with
Lambert Shaders. The exporter must not add Shininess
to the Shader data!

Fixed: The Collada Importer adds an illegal value of -1
for reflectivity when this parameters is not defined in
the imported collada data. Now reflectivity is only
set when the import data contains a valid value.

Discarded: The Collada Importer handles shininess in a
dubious way. I have discarded import for now.
This needs to be reworked carefully in 2.81.

Differential Revision: https://developer.blender.org/D5262

fix T65576 collada exporter duplicates node tree when exported material already uses nodes

fix T65480: Collada exporter did not export image texture for Base Color