Fix for Inverted Y Component on Gltf Normal Map Loading

jme3-examples/src/main/java/jme3test/model/TestGltfNormal.java

@@ -0,0 +1,89 @@
+package jme3test.model;
+
+import com.jme3.app.*;
+import com.jme3.asset.TextureKey;
+import com.jme3.asset.plugins.FileLocator;
+import com.jme3.light.AmbientLight;
+import com.jme3.light.PointLight;
+import com.jme3.material.Material;
+import com.jme3.math.ColorRGBA;
+import com.jme3.math.Vector3f;
+import com.jme3.renderer.queue.RenderQueue;
+import com.jme3.scene.*;
+import com.jme3.scene.plugins.gltf.GltfModelKey;
+import com.jme3.system.AppSettings;
+import com.jme3.util.TangentBinormalGenerator;
+import com.jme3.util.mikktspace.MikktspaceTangentGenerator;
+
+public class TestGltfNormal extends SimpleApplication {
+
+    Node probeNode;
+    PointLight light;
+    boolean flipTextures = !false;
+
+    public static void main(String[] args) {
+        AppSettings sett = new AppSettings(true);
+        sett.setWidth(1024);
+        sett.setHeight(768);
+        TestGltfNormal app = new TestGltfNormal();
+        app.setSettings(sett);
+        app.start();
+    }
+
+    @Override
+    public void simpleInitApp() {
+
+        assetManager.registerLocator(System.getProperty("user.home")+"/Downloads", FileLocator.class);
+        assetManager.registerLocator(System.getProperty("user.home")+"/java/prj/JmeUtils/assets/Models", FileLocator.class);
+
+        rootNode.setShadowMode(RenderQueue.ShadowMode.CastAndReceive);
+        probeNode = (Node) assetManager.loadModel("Scenes/defaultProbe.j3o");
+        //probeNode = new Node();
+        rootNode.attachChild(probeNode);
+
+        setPauseOnLostFocus(false);
+
+        //flyCam.setEnabled(false);
+        flyCam.setMoveSpeed(20);
+        viewPort.setBackgroundColor(new ColorRGBA().setAsSrgb(0.2f, 0.2f, 0.2f, 1.0f));
+
+        loadModel("NormalTangentMirrorTest_FromObj.j3o", new Vector3f(0, 0, 0), 3);
+
+        probeNode.addLight(new AmbientLight(ColorRGBA.Gray));
+        light = new PointLight(new Vector3f(-1f, 1f, 10f), ColorRGBA.White, 1000f);
+        rootNode.addLight(light);
+
+    }
+    @Override
+    public void simpleUpdate(float tpf) {
+        light.setPosition(cam.getLocation());
+    }
+
+    private void loadModel(String path, Vector3f offset, float scale) {
+        GltfModelKey k = new GltfModelKey(path);
+        Spatial s = assetManager.loadModel(k);
+        s.scale(scale);
+        s.move(offset);
+        s.setMaterial(createPBRLightingMat());
+        //s.setMaterial(createSPLightingMat());
+        //TangentBinormalGenerator.generate(s);
+        MikktspaceTangentGenerator.generate(s);
+        probeNode.attachChild(s);
+    }
+
+    private Material createPBRLightingMat() {
+        Material mat = new Material(assetManager, "Common/MatDefs/Light/PBRLighting.j3md");
+        mat.setTexture("BaseColorMap", assetManager.loadTexture(new TextureKey("NormalTangentMirrorTest_BaseColor.png", flipTextures)));
+        mat.setTexture("NormalMap", assetManager.loadTexture(new TextureKey("NormalTangentTest_Normal.png", flipTextures)));
+        return mat;
+    }
+
+    private Material createSPLightingMat() {
+        Material mat = new Material(assetManager, "Common/MatDefs/Light/Lighting.j3md");
+        mat.setTexture("DiffuseMap", assetManager.loadTexture(new TextureKey("NormalTangentMirrorTest_BaseColor.png", flipTextures)));
+        mat.setTexture("NormalMap", assetManager.loadTexture(new TextureKey("NormalTangentTest_Normal.png", flipTextures)));
+        mat.setBoolean("VertexLighting", false);
+        return mat;
+    }
+
+}