backface culling + normal map optimization

public/static/meshes/quiz/quiz-fortress.gltf

@@ -12,27 +12,6 @@
 	"scene":0,
 	"scenes":[
 		{
-			"extras":{
-				"KTX2ExportProperties":{
-					"enabled":1,
-					"basecolor":{
-						"basisu":{
-							"etc1s":{}
-						},
-						"astc":{}
-					},
-					"normal":{
-						"basisu":{
-							"uastc":{}
-						},
-						"astc":{}
-					},
-					"orm":{},
-					"other":{},
-					"generate_mipmaps":1,
-					"create_fallback":0
-				}
-			},
 			"name":"Scene",
 			"nodes":[
 				0,
@@ -45,23 +24,14 @@
 	],
 	"nodes":[
 		{
-			"extras":{
-				"io.maxDistance":45
-			},
 			"mesh":0,
 			"name":"floor"
 		},
 		{
-			"extras":{
-				"io.maxDistance":45
-			},
 			"mesh":1,
 			"name":"tunnel"
 		},
 		{
-			"extras":{
-				"io.maxDistance":45
-			},
 			"mesh":2,
 			"name":"door"
 		},
@@ -70,9 +40,6 @@
 			"name":"surface"
 		},
 		{
-			"extras":{
-				"io.maxDistance":45
-			},
 			"mesh":4,
 			"name":"wall"
 		}
@@ -105,7 +72,6 @@
 			}
 		},
 		{
-			"doubleSided":true,
 			"name":"stone",
 			"normalTexture":{
 				"index":3