diff --git a/render_model.py b/render_model.py
index 6ac1851..30460d7 100644
--- a/render_model.py
+++ b/render_model.py
@@ -42,9 +42,9 @@ def unit_vector(vec):
     z = vec.z.to_float()
     norm = math.sqrt(x ** 2 + y ** 2 + z ** 2)
     return type(vec)(
-        fixed_point.parse(str(x / norm)),
-        fixed_point.parse(str(y / norm)),
-        fixed_point.parse(str(z / norm))
+        fixed_point.parse(f"{x / norm:f}"),
+        fixed_point.parse(f"{y / norm:f}"),
+        fixed_point.parse(f"{z / norm:f}")
     )
 
 def xyz(vec):
@@ -70,7 +70,7 @@ def render_vertex(profile_item, vertex_tuple):
 
 def render_vertices(profile_item, prefix, name, vertices):
     yield f"// {profile_item.to_str()}"
-    yield f"vertex_{name} {prefix}_{name}[] = {{"
+    yield f"const vertex_{name} {prefix}_{name}[] = {{"
     for i, vertex in enumerate(vertices):
         yield from render_vertex(profile_item, vertex)
     yield "};"
@@ -94,7 +94,7 @@ def render_vertex_texture(profile, prefix, vertex_textures):
                                map(uv, vertex_textures))
 
 def render_object(prefix, object_name, d, material):
-    yield f"struct object {prefix}_{object_name} = {{"
+    yield f"const struct object {prefix}_{object_name} = {{"
 
     triangle_count = len(d[Triangle]) if Triangle in d else 0
     quadrilateral_count = len(d[Quadrilateral]) if Quadrilateral in d else 0
@@ -115,18 +115,18 @@ def render_object(prefix, object_name, d, material):
     if material is None:
         yield f".material = -1,",
     else:
-        yield f".material = {material.name},"
+        yield f".material = {prefix}_{material.name},"
 
     yield "};"
 
 def render_object_list(prefix, object_names):
-    yield f"struct object * {prefix}_object_list[] = {{"
+    yield f"const struct object * {prefix}_object_list[] = {{"
     for object_name in object_names:
         yield f"&{prefix}_{object_name},"
     yield "};"
 
 def render_model(prefix, object_count):
-    yield f"struct model {prefix}_model = {{"
+    yield f"const struct model {prefix}_model = {{"
     yield f".position = &{prefix}_position[0],"
     yield f".texture = &{prefix}_texture[0],"
     yield f".normal = &{prefix}_normal[0],"