update materials

valve/pbr/models/glassgibs.mdl/glassgibs.mat

@@ -5,4 +5,9 @@
 //"normal_map" "chome_glass_normal.png"
 //"metal_map" "chome_glass_metal.png"
 //"roughness_map" "chome_glass_roughness.png"
+// FIXME
+"basecolor_map" "/colors/white.png"
+"base_color" "1 1 1 1"
+"roughness" "0.01"
+"metalness" "1"
 }