Add Funky Blending layer support

[dpogue]

To Do

• Fix the Python korlib texture generation

[Hoikas]

First pass through

[Hoikas]

I think this should probably be a separate set of properties that display as angles in the UI. You could have another set of properties as your universal getters. IIRC angle float types in blender return in radians so the export math would be simpler.

[Hoikas]

Sigh, if we were on Python 3.8 this would be a good place to use the walrus...

[dpogue]

I've rebased this, and I think I've addressed the remaining feedback

[Hoikas]

I haven't actually written this down anywhere, but I'm starting to adopt a pattern with if statements in Korman where if there is ever an elif, then there must be an else:. Even if it winds up being:

else:
    pass

just so it's clear what the logic is. Could you go through your @propertys and make sure there is always an else: if there is an elif?

[Hoikas]

Suggested change

	elif funky_type == "FunkyReflect":
	ramp_layer.UVWSrc = plLayerInterface.kUVWReflect
	elif funky_type == "FunkyReflect":
	ramp_layer.UVWSrc = plLayerInterface.kUVWReflect
	else:
	raise ValueError(funky_type)

[Hoikas]

It looks like it's excepted that far_opaq could be less than near_opaq and not trigger this swap based on the additive calculation?

[dpogue]

This matches the implementation in PlasmaMax, but I copied over the comment: https://github.com/H-uru/Plasma/blob/58c833de3987fada154d914db769838ac92a6478/Sources/MaxPlugin/MaxConvert/hsMaterialConverter.cpp#L2962-L2967

[Hoikas]

Suggested change

	texture, slot = context.texture, getattr(context, "texture_slot", None)
	use_stencil = slot.use_stencil if slot is not None else False
	texture = context.texture

You don't seem to be using the texture slot or the stencilling info?

[Hoikas]

This is starting to look good. Before I merge, a couple of last questions.

• The exact appearance of these effects isn't super clear to me or what all the knobs do. Do you have a test blend that shows the feature in action? This will help when I go to write the release notes.
• It looks like in PlasmaMAX, the funky distances can feed into the span's min and max distances. Any thoughts about whether or not that should be supported immediately, or it we're fine to defer on that?