diff --git a/obj2d.rb b/obj2d.rb
index fcb70b4..494732e 100644
--- a/obj2d.rb
+++ b/obj2d.rb
@@ -11,20 +11,20 @@ struct char_desc_t
     float c_y;
 };
 
-float[<%= vertices.size * 2 %>] vertices = [
+immutable float[<%= vertices.size * 2 %>] vertices = [
 <% vertices.flatten.each do |coord| -%>
     <%= coord %>,
 <% end -%>
 ];
 
-ushort[<%= indices.size %>] indices = [
+immutable ushort[<%= indices.size %>] indices = [
 <% indices.each do |index| -%>
     <%= index %>,
 <% end -%>
 ];
 
 <% object_ranges.each_pair do |obj_name, obj_ranges| -%>
-char_desc_t[] <%= obj_name %> = [
+immutable char_desc_t[] <%= obj_name %> = [
 <%   obj_ranges.each do |obj_range| -%>
 <%     obj_verts = indices[*obj_range].map {|i| vertices[i]} -%>
 <%     c_x = (obj_verts.map {|v| v[0]}.min + obj_verts.map {|v| v[0]}.max) / 2.0 -%>
@@ -33,6 +33,9 @@ char_desc_t[] <%= obj_name %> = [
 <%   end -%>
 ];
 <% end -%>
+
+immutable float width = <%= vertices.map {|v| v[0]}.max - vertices.map {|v| v[0]}.min %>;
+immutable float height = <%= vertices.map {|v| v[1]}.max - vertices.map {|v| v[1]}.min %>;
 EOF
 
 def main(obj_fname, d_fname)
diff --git a/src/logo.d b/src/logo.d
index aa9bd20..4ac98a1 100644
--- a/src/logo.d
+++ b/src/logo.d
@@ -12,14 +12,17 @@ immutable enum int WIRE = 1;
 immutable enum int GENTEX = 0;
 immutable enum int CORPORATION = 1;
 
-logoobj.char_desc_t [][2][2] characters;
+immutable float WIDTH = logoobj.width;
+immutable float HEIGHT = logoobj.height;
+
+immutable logoobj.char_desc_t [][2][2] characters = [[logoobj.fg, logoobj.fc],
+                                                     [logoobj.lg, logoobj.lc]];
+
 /* Indexed by: face/wire, word, character */
 VAO[][2][2] object_vaos;
 
 void init()
 {
-    characters = [[logoobj.fg, logoobj.fc],
-                  [logoobj.lg, logoobj.lc]];
     Buffer vertices_buffer = new Buffer(logoobj.vertices);
     for (int draw_type = FACE; draw_type <= WIRE; draw_type++)
     {