ModelTranslator: dedupe sanitized material names, set alphaIsTransparency for alpha-test textures

Tools/ModelTranslator/unity_assets.py

@@ -33,7 +33,7 @@ def safe_name(name):
     return re.sub(r"[^0-9A-Za-z_\-]", "_", name).strip("_") or "mat"
 
 
-def texture_meta(guid, srgb, max_size):
+def texture_meta(guid, srgb, max_size, alpha_is_transparency=False):
     return """fileFormatVersion: 2
 guid: {guid}
 TextureImporter:
@@ -88,7 +88,7 @@ TextureImporter:
   spriteBorder: {{x: 0, y: 0, z: 0, w: 0}}
   spriteGenerateFallbackPhysicsShape: 1
   alphaUsage: 1
-  alphaIsTransparency: 0
+  alphaIsTransparency: {ait}
   spriteTessellationDetail: -1
   textureType: 0
   textureShape: 1
@@ -135,7 +135,8 @@ TextureImporter:
   userData:
   assetBundleName:
   assetBundleVariant:
-""".format(guid=guid, srgb=1 if srgb else 0, max_size=max_size)
+""".format(guid=guid, srgb=1 if srgb else 0, max_size=max_size,
+           ait=1 if alpha_is_transparency else 0)
 
 
 def material_yaml(name, shader_guid, base_tex_guid, mix_tex_guid, alpha_test):