Blender 5.1 support: fix vertex colors import and bump max version in README

README.md

@@ -1,6 +1,6 @@
 # Fast64
 
-This requires Blender 3.2 - 5.0.1. Blender 4.0+ is recommended.
+This requires Blender 3.2 - 5.1.2. Blender 4.0+ is recommended.
 
 Forked from [kurethedead/fast64 on BitBucket](https://bitbucket.org/kurethedead/fast64/src).
 

fast64_internal/f3d/f3d_parser.py

@@ -1864,7 +1864,7 @@ def deleteMaterialContext(self):
             raise PluginError("Attempting to delete material context that is None.")
 
     # if deleteMaterialContext is False, then manually call self.deleteMaterialContext() later.
-    def createMesh(self, obj, removeDoubles, importNormals, callDeleteMaterialContext: bool):
+    def createMesh(self, obj: bpy.types.Object, removeDoubles, importNormals, callDeleteMaterialContext: bool):
         mesh = obj.data
         if len(self.verts) % 3 != 0:
             print(len(self.verts))
@@ -1902,13 +1902,26 @@ def createMesh(self, obj, removeDoubles, importNormals, callDeleteMaterialContex
             # There will be one loop for every vertex
             uv_layer[i].uv = self.verts[i].uv
 
-        color_layer = mesh.vertex_colors.new(name="Col").data
-        for i in range(len(mesh.loops)):
-            color_layer[i].color = self.verts[i].rgb.to_4d()
-
-        alpha_layer = mesh.vertex_colors.new(name="Alpha").data
-        for i in range(len(mesh.loops)):
-            alpha_layer[i].color = [self.verts[i].alpha] * 3 + [1]
+        # The mesh.vertex_colors is deprecated since a long time,
+        # and its usage by fast64 here breaks in Blender 5.1 somehow.
+        # (can't replicate in simple cases)
+        if bpy.app.version < (5, 1, 0):
+            color_layer = mesh.vertex_colors.new(name="Col").data
+            for i in range(len(mesh.loops)):
+                color_layer[i].color = self.verts[i].rgb.to_4d()
+
+            alpha_layer = mesh.vertex_colors.new(name="Alpha").data
+            for i in range(len(mesh.loops)):
+                alpha_layer[i].color = [self.verts[i].alpha] * 3 + [1]
+        else:
+            col_attr = mesh.color_attributes.new("Col", "BYTE_COLOR", "CORNER")
+            for i in range(len(mesh.loops)):
+                col_attr.data[i].color = (*self.verts[i].rgb, 1)
+
+            alpha_attr = mesh.color_attributes.new("Alpha", "BYTE_COLOR", "CORNER")
+            for i in range(len(mesh.loops)):
+                a = self.verts[i].alpha
+                alpha_attr.data[i].color = (a, a, a, 1)
 
         if bpy.context.mode != "OBJECT":
             bpy.ops.object.mode_set(mode="OBJECT")