writing normals to IQM, but they're backwards

src/main.rs

@@ -59,9 +59,9 @@ fn main () {
 			let pos_slice = &buffer [pos_offset..(pos_offset + pos.count () * 4 * 3)];
 			
 			let norm = prim.get (&gltf::Semantic::Normals).unwrap ();
-			let pos_view = pos.view ().unwrap ();
-			let pos_offset = pos.offset () + pos_view.offset ();
-			let pos_slice = &buffer [pos_offset..(pos_offset + pos.count () * 4 * 3)];
+			let norm_view = norm.view ().unwrap ();
+			let norm_offset = norm.offset () + norm_view.offset ();
+			let norm_slice = &buffer [norm_offset..(norm_offset + norm.count () * 4 * 3)];
 			
 			let first_vertex = vertexes.len ();
 			
@@ -95,6 +95,13 @@ fn main () {
 					pos_slice [i * 4 + 3],
 				]);
 				
+				let read_norm_coord = |i| f32::from_le_bytes ([
+					norm_slice [i * 4 + 0],
+					norm_slice [i * 4 + 1],
+					norm_slice [i * 4 + 2],
+					norm_slice [i * 4 + 3],
+				]);
+				
 				let read_pos = move |i| {
 					let i = usize::try_from (i).unwrap ();
 					m.transform_point3 (Vec3::new (
@@ -104,6 +111,15 @@ fn main () {
 					))
 				};
 				
+				let read_norm = move |i| {
+					let i = usize::try_from (i).unwrap ();
+					m.transform_vector3 (Vec3::new (
+						read_norm_coord (i * 3 + 0),
+						read_norm_coord (i * 3 + 1),
+						read_norm_coord (i * 3 + 2),
+					))
+				};
+				
 				let verts = [
 					read_pos (idxs [0]),
 					read_pos (idxs [2]),
@@ -117,8 +133,14 @@ fn main () {
 					tri_start + 2,
 				]);
 				
-				for v in verts {
-					vertexes.push (v.to_array ());
+				for i in [idxs [0], idxs [2], idxs [1]] {
+					let pos = read_pos (i);
+					let norm = read_norm (i);
+					
+					vertexes.push (iqm::Vertex {
+						position: pos.to_array (),
+						normal: norm.to_array (),
+					});
 				}
 			}
 		}
@@ -242,14 +264,14 @@ fn main () {
 	
 	// Vertex position
 	
-	for t in &vertexes {
-		for x in t {
-			f.write_all (&(f32::to_le_bytes (*x))).unwrap ();
+	for v in &vertexes {
+		for x in v.position {
+			f.write_all (&(f32::to_le_bytes (x))).unwrap ();
 		}
 	}
 	
-	for t in &vertexes {
-		for x in [0.0, 0.0, 1.0] {
+	for v in &vertexes {
+		for x in v.normal {
 			f.write_all (&(f32::to_le_bytes (x))).unwrap ();
 		}
 	}
@@ -294,7 +316,8 @@ mod iqm {
 		vertex: [u32; 3],
 	}
 	
-	struct Vertex {
-		position: [f32; 3],
+	pub struct Vertex {
+		pub position: [f32; 3],
+		pub normal: [f32; 3],
 	}
 }