added some stuff for level select 3d menu

unroll_mesh.gd

@@ -0,0 +1,80 @@
+extends Object
+
+func new_array_from_typeid(typeid: Variant.Type) -> Variant:
+	return type_convert(null, typeid)
+	
+	
+func array_custom_granularity(custom_format: Mesh.ArrayCustomFormat) -> int:
+	match custom_format:
+		Mesh.ARRAY_CUSTOM_RGBA8_UNORM, Mesh.ARRAY_CUSTOM_RGBA8_SNORM, Mesh.ARRAY_CUSTOM_RG_HALF:
+			return 4
+		Mesh.ARRAY_CUSTOM_RGBA_HALF:
+			return 8
+		Mesh.ARRAY_CUSTOM_R_FLOAT:
+			return 1
+		Mesh.ARRAY_CUSTOM_RG_FLOAT:
+			return 2
+		Mesh.ARRAY_CUSTOM_RGB_FLOAT:
+			return 3
+		Mesh.ARRAY_CUSTOM_RGBA_FLOAT:
+			return 4
+	return 0
+	
+
+func array_granularity(arr_id: Mesh.ArrayType, format: Mesh.ArrayFormat) -> int:
+	match arr_id:
+		Mesh.ARRAY_VERTEX, Mesh.ARRAY_NORMAL, Mesh.ARRAY_COLOR, Mesh.ARRAY_TEX_UV, Mesh.ARRAY_TEX_UV2:
+			return 1
+		Mesh.ARRAY_TANGENT:
+			return 4
+		Mesh.ARRAY_CUSTOM0:
+			return array_custom_granularity((format >> Mesh.ARRAY_FORMAT_CUSTOM0_SHIFT) & Mesh.ARRAY_FORMAT_CUSTOM_MASK)
+		Mesh.ARRAY_CUSTOM1:
+			return array_custom_granularity((format >> Mesh.ARRAY_FORMAT_CUSTOM1_SHIFT) & Mesh.ARRAY_FORMAT_CUSTOM_MASK)
+		Mesh.ARRAY_CUSTOM2:
+			return array_custom_granularity((format >> Mesh.ARRAY_FORMAT_CUSTOM2_SHIFT) & Mesh.ARRAY_FORMAT_CUSTOM_MASK)
+		Mesh.ARRAY_CUSTOM3:
+			return array_custom_granularity((format >> Mesh.ARRAY_FORMAT_CUSTOM3_SHIFT) & Mesh.ARRAY_FORMAT_CUSTOM_MASK)
+		Mesh.ARRAY_BONES, Mesh.ARRAY_WEIGHTS:
+			if (format & Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS) != 0:
+				return 8
+			else:
+				return 4	
+		# Unhandled:
+	# ARRAY_INDEX
+	return 0
+
+## "Unroll" array mesh.
+## Known limitations: 
+## - ignores blend shapes
+## - ignores LODs
+func duplicate_vertices(input: ArrayMesh) -> ArrayMesh:
+	var output: ArrayMesh = ArrayMesh.new()
+	for surf: int  in input.get_surface_count():
+		var arrays: Array = input.surface_get_arrays(surf)
+		var indices: int  = arrays[Mesh.ARRAY_INDEX]
+		var format: Mesh.ArrayFormat = input.surface_get_format(surf)
+		var new_arrays: Array = []
+		new_arrays.resize(Mesh.ARRAY_MAX)
+		
+		for arr_id: int in len(arrays):
+			if arr_id == Mesh.ARRAY_INDEX: # this is the one we want to eliminate
+				continue
+			if arrays[arr_id] == null:
+				continue
+			var arr_in: Array = arrays[arr_id]
+			var typeid: int = typeof(arr_in)
+			var new_arr: Variant = new_array_from_typeid(typeid)
+			assert(typeof(new_arr) == typeid)
+			var granularity: int = array_granularity(arr_id, format)
+			for idx: int in indices:
+				for subidx: int in granularity:
+					new_arr.push_back(arr_in[idx * granularity + subidx])
+
+			print(arr_id, ' ', typeid, ' ', granularity, ' ', len(arr_in), '->', len(new_arr))
+
+			new_arrays[arr_id] = new_arr
+
+		output.add_surface_from_arrays(input.surface_get_primitive_type(surf), new_arrays, [], {}, format & ~Mesh.ARRAY_FORMAT_INDEX)
+
+	return output