diff --git a/roc/models.py b/roc/models.py
index c0426b7..5894aea 100755
--- a/roc/models.py
+++ b/roc/models.py
@@ -31,21 +31,10 @@ class Model_Manager(object):
 	def create(self, mname):
 		return self.models[mname].instance()
 
-	def create_sprite(self, name, path):
-		tf = self.get_texfile(path)
-		to = Texture()
-		to.load_from_texfile(tf)
-		mat = Material()
-		if noaa:
-			typeidx = enums.tt.noaa
-		else:
-			typeidx = enums.tt.diffuse
-		mat.textures[typeidx] = to
+	def create_sprite(self, name, path, centered=False, antialias=False):
+		if name in self.models:
+			return self.models[name]
 
-		rl = RenderLayer()
-		rl.mesh = SpriteMesh()
-		rl.material = mat
-		rl.scale = [float(tf.w), float(tf.h), 1.0]
 
 		model = Model()
 		model.layers = [rl]
@@ -469,7 +458,38 @@ class Model(object):
 		for layer in self.layers:
 			return [layer.scale[i] for i in range(0, len(layer.scale))]
 		
-		
+	
+	def add_sprite_layer(self, path, centered=False, antialiased=False, rot=0.0):
+		tf = self.get_texfile(path)
+		to = Texture()
+		to.load_from_texfile(tf)
+		mat = Material()
+		typeidx = enums.tt.noaa
+		if antialiased:
+			typeidx = enums.tt.diffuse
+		mat.textures[typeidx] = to
+
+		rl = RenderLayer()
+		if centered:
+			rl.mesh = SpriteMeshCentered()
+		else:
+			rl.mesh = SpriteMesh()
+		rl.rotations = (0.0, 0.0, rot)
+		rl.material = mat
+		rl.scale = [float(tf.w), float(tf.h), 1.0]
+
+		self.layers.append(rl)
+
+	def rotate(self, rot):
+		for layer in self.layers:
+			if layer.rotations == None:
+				oldrot = [0.0, 0.0, 0.0]
+			else:
+				oldrot = list(layer.rotations)
+			for i in range(3):
+				oldrot[i] = (oldrot[i] + rot[i] + 360.0) % 360.0
+			layer.rotations = oldrot
+
 	def load(self, data):
 		tmplayers = []
 		for rend in data.render: