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Diffstat (limited to 'engine/src/core/com/jme3/scene/shape/PQTorus.java')
| -rw-r--r-- | engine/src/core/com/jme3/scene/shape/PQTorus.java | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/engine/src/core/com/jme3/scene/shape/PQTorus.java b/engine/src/core/com/jme3/scene/shape/PQTorus.java new file mode 100644 index 0000000..26baed7 --- /dev/null +++ b/engine/src/core/com/jme3/scene/shape/PQTorus.java @@ -0,0 +1,239 @@ +/* + * Copyright (c) 2009-2012 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. + */ + +// $Id: PQTorus.java 4131 2009-03-19 20:15:28Z blaine.dev $ +package com.jme3.scene.shape; + +import com.jme3.export.InputCapsule; +import com.jme3.export.JmeExporter; +import com.jme3.export.JmeImporter; +import com.jme3.export.OutputCapsule; +import com.jme3.math.FastMath; +import com.jme3.math.Vector3f; +import com.jme3.scene.Mesh; +import com.jme3.scene.VertexBuffer.Type; +import static com.jme3.util.BufferUtils.*; +import java.io.IOException; +import java.nio.FloatBuffer; +import java.nio.ShortBuffer; + +/** + * A parameterized torus, also known as a <em>pq</em> torus. + * + * @author Joshua Slack, Eric Woroshow + * @version $Revision: 4131 $, $Date: 2009-03-19 16:15:28 -0400 (Thu, 19 Mar 2009) $ + */ +public class PQTorus extends Mesh { + + private float p, q; + + private float radius, width; + + private int steps, radialSamples; + + public PQTorus() { + } + + /** + * Creates a parameterized torus. + * <p> + * Steps and radialSamples are both degree of accuracy values. + * + * @param p the x/z oscillation. + * @param q the y oscillation. + * @param radius the radius of the PQTorus. + * @param width the width of the torus. + * @param steps the steps along the torus. + * @param radialSamples radial samples for the torus. + */ + public PQTorus(float p, float q, float radius, float width, + int steps, int radialSamples) { + super(); + updateGeometry(p, q, radius, width, steps, radialSamples); + } + + public float getP() { + return p; + } + + public float getQ() { + return q; + } + + public int getRadialSamples() { + return radialSamples; + } + + public float getRadius() { + return radius; + } + + public int getSteps() { + return steps; + } + + public float getWidth() { + return width; + } + + public void read(JmeImporter e) throws IOException { + super.read(e); + InputCapsule capsule = e.getCapsule(this); + p = capsule.readFloat("p", 0); + q = capsule.readFloat("q", 0); + radius = capsule.readFloat("radius", 0); + width = capsule.readFloat("width", 0); + steps = capsule.readInt("steps", 0); + radialSamples = capsule.readInt("radialSamples", 0); + } + + /** + * Rebuilds this torus based on a new set of parameters. + * + * @param p the x/z oscillation. + * @param q the y oscillation. + * @param radius the radius of the PQTorus. + * @param width the width of the torus. + * @param steps the steps along the torus. + * @param radialSamples radial samples for the torus. + */ + public void updateGeometry(float p, float q, float radius, float width, int steps, int radialSamples) { + this.p = p; + this.q = q; + this.radius = radius; + this.width = width; + this.steps = steps; + this.radialSamples = radialSamples; + + final float thetaStep = (FastMath.TWO_PI / steps); + final float betaStep = (FastMath.TWO_PI / radialSamples); + Vector3f[] torusPoints = new Vector3f[steps]; + + // Allocate all of the required buffers + int vertCount = radialSamples * steps; + + FloatBuffer fpb = createVector3Buffer(vertCount); + FloatBuffer fnb = createVector3Buffer(vertCount); + FloatBuffer ftb = createVector2Buffer(vertCount); + + Vector3f pointB = new Vector3f(), T = new Vector3f(), N = new Vector3f(), B = new Vector3f(); + Vector3f tempNorm = new Vector3f(); + float r, x, y, z, theta = 0.0f, beta = 0.0f; + int nvertex = 0; + + // Move along the length of the pq torus + for (int i = 0; i < steps; i++) { + theta += thetaStep; + float circleFraction = ((float) i) / (float) steps; + + // Find the point on the torus + r = (0.5f * (2.0f + FastMath.sin(q * theta)) * radius); + x = (r * FastMath.cos(p * theta) * radius); + y = (r * FastMath.sin(p * theta) * radius); + z = (r * FastMath.cos(q * theta) * radius); + torusPoints[i] = new Vector3f(x, y, z); + + // Now find a point slightly farther along the torus + r = (0.5f * (2.0f + FastMath.sin(q * (theta + 0.01f))) * radius); + x = (r * FastMath.cos(p * (theta + 0.01f)) * radius); + y = (r * FastMath.sin(p * (theta + 0.01f)) * radius); + z = (r * FastMath.cos(q * (theta + 0.01f)) * radius); + pointB = new Vector3f(x, y, z); + + // Approximate the Frenet Frame + T = pointB.subtract(torusPoints[i]); + N = torusPoints[i].add(pointB); + B = T.cross(N); + N = B.cross(T); + + // Normalise the two vectors and then use them to create an oriented circle + N = N.normalize(); + B = B.normalize(); + beta = 0.0f; + for (int j = 0; j < radialSamples; j++, nvertex++) { + beta += betaStep; + float cx = FastMath.cos(beta) * width; + float cy = FastMath.sin(beta) * width; + float radialFraction = ((float) j) / radialSamples; + tempNorm.x = (cx * N.x + cy * B.x); + tempNorm.y = (cx * N.y + cy * B.y); + tempNorm.z = (cx * N.z + cy * B.z); + fnb.put(tempNorm.x).put(tempNorm.y).put(tempNorm.z); + tempNorm.addLocal(torusPoints[i]); + fpb.put(tempNorm.x).put(tempNorm.y).put(tempNorm.z); + ftb.put(radialFraction).put(circleFraction); + } + } + + // Update the indices data + ShortBuffer sib = createShortBuffer(6 * vertCount); + for (int i = 0; i < vertCount; i++) { + sib.put(new short[] { + (short)(i), + (short)(i - radialSamples), + (short)(i + 1), + (short)(i + 1), + (short)(i - radialSamples), + (short)(i - radialSamples + 1) + }); + } + for (int i = 0, len = sib.capacity(); i < len; i++) { + int ind = sib.get(i); + if (ind < 0) { + ind += vertCount; + sib.put(i, (short) ind); + } else if (ind >= vertCount) { + ind -= vertCount; + sib.put(i, (short) ind); + } + } + sib.rewind(); + + setBuffer(Type.Position, 3, fpb); + setBuffer(Type.Normal, 3, fnb); + setBuffer(Type.TexCoord, 2, ftb); + setBuffer(Type.Index, 3, sib); + } + + @Override + public void write(JmeExporter e) throws IOException { + super.write(e); + OutputCapsule capsule = e.getCapsule(this); + capsule.write(p, "p", 0); + capsule.write(q, "q", 0); + capsule.write(radius, "radius", 0); + capsule.write(width, "width", 0); + capsule.write(steps, "steps", 0); + capsule.write(radialSamples, "radialSamples", 0); + } + +}
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