jme3-core tests: add the TestBoundingBox class

jme3-core/src/test/java/com/jme3/bounding/TestBoundingBox.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2021 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.bounding;
+
+import com.jme3.math.Vector3f;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Test cases for the BoundingSphere class.
+ *
+ * @author Stephen Gold
+ */
+public class TestBoundingSphere {
+    /**
+     * Verify that equals() behaves as expected.
+     */
+    @Test
+    public void testEquals() {
+        BoundingSphere bs1 = new BoundingSphere(0f, new Vector3f(3f, 4f, 5f));
+        BoundingSphere bs2 = new BoundingSphere(-0f, new Vector3f(3f, 4f, 5f));
+
+        BoundingSphere bs3 = new BoundingSphere(1f, new Vector3f(3f, 0f, 2f));
+        BoundingSphere bs4 = new BoundingSphere(1f, new Vector3f(3f, -0f, 2f));
+
+        BoundingSphere bs5 = new BoundingSphere(2f, new Vector3f(4f, 5f, 6f));
+        BoundingSphere bs6 = (BoundingSphere) bs5.clone();
+        bs6.setCheckPlane(1);
+
+        // Clones are equal to their base instances:
+        Assert.assertEquals(bs1, bs1.clone());
+        Assert.assertEquals(bs2, bs2.clone());
+        Assert.assertEquals(bs3, bs3.clone());
+        Assert.assertEquals(bs4, bs4.clone());
+        Assert.assertEquals(bs5, bs5.clone());
+        Assert.assertEquals(bs6, bs6.clone());
+
+        Assert.assertNotEquals(bs1, bs2); // because their radii differ
+        Assert.assertNotEquals(bs3, bs4); // because their centers differ
+        Assert.assertEquals(bs5, bs6); // because check planes are ignored
+    }
+
+    /**
+     * Verify that isSimilar() behaves as expected.
+     */
+    @Test
+    public void testIsSimilar() {
+        BoundingSphere bs1 = new BoundingSphere(0f, new Vector3f(3f, 4f, 5f));
+        BoundingSphere bs2 = new BoundingSphere(0.1f, new Vector3f(3f, 4f, 5f));
+
+        BoundingSphere bs3 = new BoundingSphere(1f, new Vector3f(3f, 4f, 2f));
+        BoundingSphere bs4 = new BoundingSphere(1f, new Vector3f(3f, 3.9f, 2f));
+
+        BoundingSphere bs5 = new BoundingSphere(2f, new Vector3f(4f, 5f, 6f));
+        BoundingSphere bs6 = (BoundingSphere) bs5.clone();
+        bs6.setCheckPlane(1);
+
+        Assert.assertFalse(bs1.isSimilar(bs2, 0.09999f));
+        Assert.assertTrue(bs1.isSimilar(bs2, 0.10001f));
+
+        Assert.assertFalse(bs3.isSimilar(bs4, 0.09999f));
+        Assert.assertTrue(bs3.isSimilar(bs4, 0.10001f));
+
+        Assert.assertTrue(bs5.isSimilar(bs6, 0f)); // check planes are ignored
+    }
+
+    /**
+     * Verify that an infinite bounding sphere can be merged with a very
+     * eccentric bounding box without producing NaNs. This was issue #1459 at
+     * GitHub.
+     */
+    @Test
+    public void testIssue1459() {
+        Vector3f boxCenter = new Vector3f(-92f, 3.3194322e29f, 674.89886f);
+        BoundingBox boundingBox = new BoundingBox(boxCenter,
+                1.0685959f, 3.3194322e29f, 2.705017f);
+
+        Vector3f sphCenter = new Vector3f(0f, 0f, 0f);
+        float radius = Float.POSITIVE_INFINITY;
+        BoundingSphere boundingSphere = new BoundingSphere(radius, sphCenter);
+
+        boundingSphere.mergeLocal(boundingBox);
+
+        Vector3f copyCenter = new Vector3f();
+        boundingSphere.getCenter(copyCenter);
+        Assert.assertTrue(Vector3f.isValidVector(copyCenter));
+    }
+}