io_scene_3ds: Update for Blender 3.x #104507

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Sebastian Sille wants to merge 12 commits from nrgsille-patch-2 into main

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@ -668,7 +668,7 @@ def make_material_chunk(material, image):
material_chunk.add_subchunk(make_material_subchunk(MATAMBIENT, wrap.emission_color[:3]))
material_chunk.add_subchunk(make_material_subchunk(MATDIFFUSE, wrap.base_color[:3]))
material_chunk.add_subchunk(make_material_subchunk(MATSPECULAR, material.specular_color[:]))
material_chunk.add_subchunk(make_percent_subchunk(MATSHINESS, wrap.roughness))
material_chunk.add_subchunk(make_percent_subchunk(MATSHINESS, 1 - wrap.roughness))
material_chunk.add_subchunk(make_percent_subchunk(MATSHIN2, wrap.specular))
material_chunk.add_subchunk(make_percent_subchunk(MATSHIN3, wrap.metallic))
material_chunk.add_subchunk(make_percent_subchunk(MATTRANS, 1 - wrap.alpha))
@ -716,7 +716,7 @@ def make_material_chunk(material, image):
if wrap.roughness_texture:
roughness = [wrap.roughness_texture]
r_pct = material.roughness
r_pct = 1 - material.roughness
matmap = make_material_texture_chunk(MAT_SHINMAP, roughness, r_pct)
if matmap:
material_chunk.add_subchunk(matmap)
@ -749,7 +749,7 @@ def make_material_chunk(material, image):
material_chunk.add_subchunk(make_material_subchunk(MATAMBIENT, material.line_color[:3]))
material_chunk.add_subchunk(make_material_subchunk(MATDIFFUSE, material.diffuse_color[:3]))
material_chunk.add_subchunk(make_material_subchunk(MATSPECULAR, material.specular_color[:]))
material_chunk.add_subchunk(make_percent_subchunk(MATSHINESS, material.roughness))
material_chunk.add_subchunk(make_percent_subchunk(MATSHINESS, 1 - material.roughness))
material_chunk.add_subchunk(make_percent_subchunk(MATSHIN2, material.specular_intensity))
material_chunk.add_subchunk(make_percent_subchunk(MATSHIN3, material.metallic))
material_chunk.add_subchunk(make_percent_subchunk(MATTRANS, 1 - material.diffuse_color[3]))