Merge pull request #5017 from myselfhimself/patch-1

#4866 V texture coordinate inversion on OBJ loadModel
processing · Jan 29, 2021 · c2c8992 · c2c8992
2 parents 23db9e6 + 2b6302d
commit c2c8992
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/webgl/loading.js b/src/webgl/loading.js
@@ -222,8 +222,10 @@ function parseObj(model, lines) {
         loadedVerts[tokens[0]].push(vertex);
       } else if (tokens[0] === 'vt') {
         // Check if this line describes a texture coordinate.
-        // It will have two numeric parameters.
-        const texVertex = [parseFloat(tokens[1]), parseFloat(tokens[2])];
+        // It will have two numeric parameters U and V (W is omitted).
+        // Because of WebGL texture coordinates rendering behaviour, the V
+        // coordinate is inversed.
+        const texVertex = [parseFloat(tokens[1]), 1 - parseFloat(tokens[2])];
         loadedVerts[tokens[0]].push(texVertex);
       } else if (tokens[0] === 'f') {
         // Check if this line describes a face.