add blank material files

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

@@ -0,0 +1,24 @@
+
+{
+"for" "-0SandRock"
+//"basecolor_map" "-0SandRock.png"
+//"normal_map" "-0SandRock_normal.png"
+//"metal_map" "-0SandRock_metal.png"
+//"roughness_map" "-0SandRock_roughness.png"
+}
+
+{
+"for" "-1SandRock"
+//"basecolor_map" "-1SandRock.png"
+//"normal_map" "-1SandRock_normal.png"
+//"metal_map" "-1SandRock_metal.png"
+//"roughness_map" "-1SandRock_roughness.png"
+}
+
+{
+"for" "-2SandRock"
+//"basecolor_map" "-2SandRock.png"
+//"normal_map" "-2SandRock_normal.png"
+//"metal_map" "-2SandRock_metal.png"
+//"roughness_map" "-2SandRock_roughness.png"
+}