add blank material files

cstrike/pbr/cs_dust.wad/-Sand/-Sand.mat

@@ -0,0 +1,32 @@
+
+{
+"for" "-0Sand"
+//"basecolor_map" "-0Sand.png"
+//"normal_map" "-0Sand_normal.png"
+//"metal_map" "-0Sand_metal.png"
+//"roughness_map" "-0Sand_roughness.png"
+}
+
+{
+"for" "-1Sand"
+//"basecolor_map" "-1Sand.png"
+//"normal_map" "-1Sand_normal.png"
+//"metal_map" "-1Sand_metal.png"
+//"roughness_map" "-1Sand_roughness.png"
+}
+
+{
+"for" "-2Sand"
+//"basecolor_map" "-2Sand.png"
+//"normal_map" "-2Sand_normal.png"
+//"metal_map" "-2Sand_metal.png"
+//"roughness_map" "-2Sand_roughness.png"
+}
+
+{
+"for" "-3Sand"
+//"basecolor_map" "-3Sand.png"
+//"normal_map" "-3Sand_normal.png"
+//"metal_map" "-3Sand_metal.png"
+//"roughness_map" "-3Sand_roughness.png"
+}