Rewrite Material Import Logic

[SE2Dev]

The old material logic that the XModel importer used, no longer functions (as of Blender 2.80), as the Blender Internal renderer is no longer supported.

The material system must be rewritten to support Cycles & EEVEE.

Import

• Blank material generation
• Shader generation
  • Attempt to automatically determine what specular / gloss method to use
  • Attempt to automatically determine normal map method to use
  • Support additional texture types (emission, etc.)
  • Support texture layering
  • Automatic node layout generation

Export

• Identify texture images & usage types for exported materials