#2275 Improve assertions for invalid transforms.

jme3-core/src/main/java/com/jme3/math/Quaternion.java

@@ -1608,4 +1608,27 @@ public Quaternion clone() {
             throw new AssertionError(); // can not happen
         }
     }
+
+    /**
+     * Tests whether the argument is a valid quaternion, returning false if it's
+     * null or if any component is NaN or infinite.
+     *
+     * @param quaternion the vector to test (unaffected)
+     * @return true if non-null and finite, otherwise false
+     */
+    public static boolean isValidQuaternion(Quaternion quaternion) {
+        if (quaternion == null) {
+            return false;
+        }
+        if (Float.isNaN(quaternion.x)
+                || Float.isNaN(quaternion.y)
+                || Float.isNaN(quaternion.z)
+                || Float.isNaN(quaternion.w)) {
+            return false;
+        }
+        return !Float.isInfinite(quaternion.x)
+                && !Float.isInfinite(quaternion.y)
+                && !Float.isInfinite(quaternion.z)
+                && !Float.isInfinite(quaternion.w);
+    }
 }

jme3-core/src/main/java/com/jme3/math/Transform.java

@@ -121,6 +121,7 @@ public Transform() {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setRotation(Quaternion rot) {
+        assert Quaternion.isValidQuaternion(rot) : "Invalid rotation " + rot;
         this.rot.set(rot);
         return this;
     }
@@ -132,6 +133,7 @@ public Transform setRotation(Quaternion rot) {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setTranslation(Vector3f trans) {
+        assert Vector3f.isValidVector(trans) : "Invalid translation " + trans;
         this.translation.set(trans);
         return this;
     }
@@ -152,6 +154,7 @@ public Vector3f getTranslation() {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setScale(Vector3f scale) {
+        assert Vector3f.isValidVector(scale) : "Invalid scale " + scale;
         this.scale.set(scale);
         return this;
     }
@@ -163,6 +166,7 @@ public Transform setScale(Vector3f scale) {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setScale(float scale) {
+        assert Float.isFinite(scale) : "Invalid scale " + scale;
         this.scale.set(scale, scale, scale);
         return this;
     }
@@ -286,6 +290,7 @@ public Transform combineWithParent(Transform parent) {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setTranslation(float x, float y, float z) {
+        assert Float.isFinite(x) && Float.isFinite(y) && Float.isFinite(z) : "Invalid translation " + x + ", " + y + ", " + z;
         translation.set(x, y, z);
         return this;
     }
@@ -299,6 +304,7 @@ public Transform setTranslation(float x, float y, float z) {
      * @return the (modified) current instance (for chaining)
      */
     public Transform setScale(float x, float y, float z) {
+        assert Float.isFinite(x) && Float.isFinite(y) && Float.isFinite(z) : "Invalid scale " + x + ", " + y + ", " + z;
         scale.set(x, y, z);
         return this;
     }

jme3-core/src/test/java/com/jme3/math/QuaternionTest.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2023 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.math;
+
+import junit.framework.TestCase;
+
+/**
+ * Verifies that the {@link Quaternion} class works correctly.
+ *
+ * @author Richard Tingle (aka Richtea)
+ */
+public class QuaternionTest extends TestCase{
+
+    /**
+     * Verify that the {@link Quaternion#isValidQuaternion(com.jme3.math.Quaternion)} method works correctly. Testing
+     * for NaNs and infinities (which are not "valid")
+     */
+    public void testIsValidQuaternion(){
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(Float.NaN, 2.1f, 3.0f, 1.5f)));
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(1f, Float.NaN, 3.0f, 1.5f)));
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(1f, 2.1f, Float.NaN, 1.5f)));
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(1f, 2.1f, 3.0f, Float.NaN)));
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(Float.POSITIVE_INFINITY, 1.5f, 1.9f, 2.0f)));
+        assertFalse(Quaternion.isValidQuaternion(new Quaternion(Float.NEGATIVE_INFINITY, 2.5f, 8.2f, 3.0f)));
+        assertFalse(Quaternion.isValidQuaternion(null));
+
+        assertTrue(Quaternion.isValidQuaternion(new Quaternion()));
+        assertTrue(Quaternion.isValidQuaternion(new Quaternion(1.5f, -5.7f, 8.2f, 3.0f)));
+    }
+}