add blank material files

valve/pbr/halflife.wad/-GENPIPE1/-GENPIPE1.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "-0GENPIPE1"
+//"basecolor_map" "-0GENPIPE1.png"
+//"normal_map" "-0GENPIPE1_normal.png"
+//"metal_map" "-0GENPIPE1_metal.png"
+//"roughness_map" "-0GENPIPE1_roughness.png"
+}
+
+{
+"for" "-1GENPIPE1"
+//"basecolor_map" "-1GENPIPE1.png"
+//"normal_map" "-1GENPIPE1_normal.png"
+//"metal_map" "-1GENPIPE1_metal.png"
+//"roughness_map" "-1GENPIPE1_roughness.png"
+}
+
+{
+"for" "-2GENPIPE1"
+//"basecolor_map" "-2GENPIPE1.png"
+//"normal_map" "-2GENPIPE1_normal.png"
+//"metal_map" "-2GENPIPE1_metal.png"
+//"roughness_map" "-2GENPIPE1_roughness.png"
+}