add blank material files

gearbox/pbr/models/egg.mdl/egg.mdl.mat

@@ -0,0 +1,16 @@
+
+{
+"for" "#models/egg/egg_inside.mdl"
+//"basecolor_map" "egg_inside.png"
+//"normal_map" "egg_inside_normal.png"
+//"metal_map" "egg_inside_metal.png"
+//"roughness_map" "egg_inside_roughness.png"
+}
+
+{
+"for" "#models/egg/egg_shell.mdl"
+//"basecolor_map" "egg_shell.png"
+//"normal_map" "egg_shell_normal.png"
+//"metal_map" "egg_shell_metal.png"
+//"roughness_map" "egg_shell_roughness.png"
+}