Updated Max exporter.

Made face flipping heuristics optional, it messes up scenes that are ok.

For scenes that after exporting have objects with flipped normals, original assets can be fixed in Max in a following way:

1. find out problematic objects in Max
  1. select all objects
  2. set View -> xView to show "Face Orientation"
  3. select all object that are fully/mostly green
  4. in Utilities apply Reset XForm to selected objects (this will show messed normals also in Max, otherwise they are hidden)

2. fix problematic objects
  1. apply Normals => flipNormals modifier to selected object

utils/exporters/max/ThreeJSExporter.ms

@@ -41,16 +41,17 @@ rollout ThreeJSExporter "ThreeJSExporter"
 	group "ThreeJSExporter  v0.2" 
 	(
 
-		label msg "Exports meshes in Three.js ascii JSON format" align:#left
-		hyperLink lab1 "Original source can be found here" address:"https://github.com/mrdoob/three.js" align:#left
+		label msg "Exports selected meshes in Three.js ascii JSON format" align:#left
+		hyperLink lab1 "Original source at GitHub" address:"https://github.com/mrdoob/three.js" align:#left
 
-		checkbox flipYZ "Flip YZ" checked:true enabled:true
-		checkbox flipUV "Flip UV" checked:true enabled:true
-		checkbox flipFace "Flip faces" checked:false enabled:true
-		checkbox exportNormal "Export normals" checked:true enabled:true
-		checkbox smoothNormal "Use vertex normals" checked:true enabled:true
 		checkbox exportUv "Export uvs" checked:true enabled:true
+		checkbox exportNormal "Export normals" checked:true enabled:true
+		checkbox smoothNormal "Use vertex normals" checked:false enabled:true
 		checkbox exportColor "Export vertex colors" checked:false enabled:false
+		checkbox flipYZ "Flip YZ" checked:true enabled:true
+		checkbox flipUV "Flip UV" checked:true enabled:true
+		checkbox flipFace "Flip all faces" checked:false enabled:true
+		checkbox autoflipFace "Try fixing flipped faces" checked:false enabled:true
 
 	)
 
@@ -489,7 +490,7 @@ rollout ThreeJSExporter "ThreeJSExporter"
 
 				n = GetNormal obj i
 
-				if needsFlip then
+				if flipFace.checked or needsFlip then
 				(
 					n.x *= -1
 					n.y *= -1
@@ -511,7 +512,7 @@ rollout ThreeJSExporter "ThreeJSExporter"
 
 				n = GetFaceNormal obj i
 
-				if needsFlip then
+				if flipFace.checked or needsFlip then
 				(
 					n.x *= -1
 					n.y *= -1
@@ -694,7 +695,14 @@ rollout ThreeJSExporter "ThreeJSExporter"
 
 		if SuperClassOf node == GeometryClass then
 		(
-			return #( SnapshotAsMesh node, node.name, node.material, NeedsFaceFlip node )
+			needsFlip = false
+			
+			if autoflipFace.checked then
+			(
+				needsFlip = NeedsFaceFlip node
+			)
+			
+			return #( SnapshotAsMesh node, node.name, node.material, needsFlip )
 
 		)