Fix up texture coordinate handling from OBJ/COLLADA to CEM

src/collada_export.rs

@@ -61,7 +61,7 @@ impl<'n> fmt::Display for Geometry<'n> {
 
 			write_source("mesh-positions", &self.mesh_positions, 3, FORMAT_POS)?;
 			write_source("mesh-normals", &self.mesh_normals, 3, FORMAT_POS)?;
-			write_source("mesh-map", &self.mesh_map, 3, FORMAT_TEX)?;
+			write_source("mesh-map", &self.mesh_map, 2, FORMAT_TEX)?;
 		}
 
 		writeln!(f, r##"        <vertices id="{0}-mesh-vertices"><input semantic="POSITION" source="#{0}-mesh-positions"/></vertices>"##, self.name)?;
@@ -138,7 +138,7 @@ pub fn convert(cem: Scene<V2>) -> String {
 			geometry.mesh_normals[index*3 + 2] = normal.z;
 
 			geometry.mesh_map[index*2 + 0] = vertex.texture.x;
-			geometry.mesh_map[index*2 + 1] = vertex.texture.y;
+			geometry.mesh_map[index*2 + 1] = 1.0 - vertex.texture.y;
 		}
 
 		writeln!(string, "{}", geometry).unwrap();

src/main.rs

@@ -210,7 +210,7 @@ fn obj_to_cem(i: &Object) -> V2 {
 				vertices.push(v2::Vertex {
 					position,
 					normal,
-					texture: Point2 { x: texture.u as f32, y: texture.v as f32 },
+					texture: Point2 { x: texture.u as f32, y: 1.0 - texture.v as f32 },
 				});
 
 				index
@@ -285,7 +285,7 @@ fn cem2_to_obj(cem: V2, frame_index: usize) -> String {
 
 		writeln!(string, "v {} {} {}", position.x, position.y, position.z).unwrap();
 		writeln!(string, "vn {} {} {}", normal.x, normal.y, normal.z).unwrap();
-		writeln!(string, "vt {} {}", texture.x, texture.y).unwrap();
+		writeln!(string, "vt {} {}", texture.x, 1.0 - texture.y).unwrap();
 	}
 
 	for &v2::Material { ref name, texture, ref triangles, vertex_offset, vertex_count: _vertex_count, ref texture_name } in &cem.materials {