add blank material files

bshift/pbr/models/bm_sack.mdl/bm_sack.mdl.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/bm_sack/aliengeneric3.mdl"
+//"basecolor_map" "aliengeneric3.png"
+//"normal_map" "aliengeneric3_normal.png"
+//"metal_map" "aliengeneric3_metal.png"
+//"roughness_map" "aliengeneric3_roughness.png"
+}
+
+{
+"for" "#models/bm_sack/bottom.mdl"
+//"basecolor_map" "bottom.png"
+//"normal_map" "bottom_normal.png"
+//"metal_map" "bottom_metal.png"
+//"roughness_map" "bottom_roughness.png"
+}
+
+{
+"for" "#models/bm_sack/sid1.mdl"
+//"basecolor_map" "sid1.png"
+//"normal_map" "sid1_normal.png"
+//"metal_map" "sid1_metal.png"
+//"roughness_map" "sid1_roughness.png"
+}