testcase & fix for issue #744: collideWith() versus setIgnoreTransform()

jme3-core/src/main/java/com/jme3/scene/Geometry.java

@@ -398,6 +398,9 @@ public class Geometry extends Spatial {
 
         // Compute the cached world matrix
         cachedWorldMat.loadIdentity();
+        if (ignoreTransform) {
+            return;
+        }
         cachedWorldMat.setRotationQuaternion(worldTransform.getRotation());
         cachedWorldMat.setTranslation(worldTransform.getTranslation());
 

jme3-core/src/test/java/com/jme3/collision/CollideIgnoreTransformTest.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2017 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.collision;
+
+import com.jme3.asset.AssetManager;
+import com.jme3.asset.DesktopAssetManager;
+import com.jme3.asset.plugins.ClasspathLocator;
+import com.jme3.material.Material;
+import com.jme3.material.plugins.J3MLoader;
+import com.jme3.math.Ray;
+import com.jme3.math.Vector3f;
+import com.jme3.scene.Geometry;
+import com.jme3.scene.Mesh;
+import com.jme3.scene.Node;
+import com.jme3.scene.shape.Quad;
+import org.junit.Test;
+
+/**
+ * Verify that collideWith() works with ignoreTransforms. This was issue #744 at
+ * GitHub.
+ *
+ * @author Stephen Gold
+ */
+public class CollideIgnoreTransformTest {
+
+    AssetManager assetManager;
+
+    Node rootNode;
+
+    /**
+     * Cast a ray at the geometry and check the number of collisions.
+     */
+    void castRay(Ray ray, int expectedNumResults) {
+        CollisionResults results = new CollisionResults();
+        rootNode.collideWith(ray, results);
+        int numResults = results.size();
+        if (numResults != expectedNumResults) {
+            String msg = String.format("Expected %d, got %d.",
+                    expectedNumResults, numResults);
+            throw new RuntimeException(msg);
+        }
+    }
+
+    /**
+     * Attach a red square in the XY plane with its lower left corner at (0, 0,
+     * 0). It is composed of 2 triangles.
+     */
+    void createRedSquare() {
+        Mesh quadMesh = new Quad(1f, 1f);
+        Geometry redSquare = new Geometry("red square", quadMesh);
+        Material red = assetManager.loadMaterial("Common/Materials/RedColor.j3m");
+        redSquare.setMaterial(red);
+        rootNode.attachChild(redSquare);
+
+        redSquare.setLocalTranslation(0f, 3f, 0f);
+        redSquare.setIgnoreTransform(true);
+    }
+
+    @Test
+    public void testPhantomTriangles() {
+        assetManager = new DesktopAssetManager();
+        assetManager.registerLocator(null, ClasspathLocator.class);
+        assetManager.registerLoader(J3MLoader.class, "j3m", "j3md");
+        rootNode = new Node();
+
+        createRedSquare();
+
+        rootNode.updateLogicalState(0.01f);
+        rootNode.updateGeometricState();
+        /**
+         * ray in the -Z direction, starting from (0.5, 0.6, 10)
+         */
+        Ray ray1 = new Ray(/* origin */new Vector3f(0.5f, 0.6f, 10f),
+                /* direction */ new Vector3f(0f, 0f, -1f));
+        castRay(ray1, 1);
+        /**
+         * ray in the -Z direction, starting from (0.5, 3, 10)
+         */
+        Ray ray0 = new Ray(/* origin */new Vector3f(0.5f, 3f, 10f),
+                /* direction */ new Vector3f(0f, 0f, -1f));
+        castRay(ray0, 0);
+    }
+}