+ <material name="wtgrey">
+ <color rgba="0.5 0.5 0.5 0.5"/>
+ </material>
+ <material name="wtred">
+ <color rgba="1 0 0 1"/>
+ </material>
+ <material name="wtblack">
+ <color rgba="0 0 0 1"/>
+ </material>
+ <material name="wtgreen">
+ <color rgba="0 1 0 0.8"/>
+ </material>
+