add blank material files

bshift/pbr/models/ball.mdl/ball.mdl.mat

@@ -0,0 +1,16 @@
+
+{
+"for" "#models/ball/pointer.mdl"
+//"basecolor_map" "pointer.png"
+//"normal_map" "pointer_normal.png"
+//"metal_map" "pointer_metal.png"
+//"roughness_map" "pointer_roughness.png"
+}
+
+{
+"for" "#models/ball/soccer.mdl"
+//"basecolor_map" "soccer.png"
+//"normal_map" "soccer_normal.png"
+//"metal_map" "soccer_metal.png"
+//"roughness_map" "soccer_roughness.png"
+}