/*
* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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 com.jme3.util.BufferUtils;
import java.io.IOException;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;
/**
* An ordinary (single holed) torus.
* <p>
* The center is by default the origin.
*
* @author Mark Powell
* @version $Revision: 4131 $, $Date: 2009-03-19 16:15:28 -0400 (Thu, 19 Mar 2009) $
*/
public class Torus extends Mesh {
private int circleSamples;
private int radialSamples;
private float innerRadius;
private float outerRadius;
public Torus() {
}
/**
* Constructs a new Torus. Center is the origin, but the Torus may be
* transformed.
*
* @param circleSamples
* The number of samples along the circles.
* @param radialSamples
* The number of samples along the radial.
* @param innerRadius
* The radius of the inner begining of the Torus.
* @param outerRadius
* The radius of the outter end of the Torus.
*/
public Torus(int circleSamples, int radialSamples,
float innerRadius, float outerRadius) {
super();
updateGeometry(circleSamples, radialSamples, innerRadius, outerRadius);
}
public int getCircleSamples() {
return circleSamples;
}
public float getInnerRadius() {
return innerRadius;
}
public float getOuterRadius() {
return outerRadius;
}
public int getRadialSamples() {
return radialSamples;
}
@Override
public void read(JmeImporter e) throws IOException {
super.read(e);
InputCapsule capsule = e.getCapsule(this);
circleSamples = capsule.readInt("circleSamples", 0);
radialSamples = capsule.readInt("radialSamples", 0);
innerRadius = capsule.readFloat("innerRadius", 0);
outerRadius = capsule.readFloat("outerRaidus", 0);
}
private void setGeometryData() {
// allocate vertices
int vertCount = (circleSamples + 1) * (radialSamples + 1);
FloatBuffer fpb = BufferUtils.createVector3Buffer(vertCount);
setBuffer(Type.Position, 3, fpb);
// allocate normals if requested
FloatBuffer fnb = BufferUtils.createVector3Buffer(vertCount);
setBuffer(Type.Normal, 3, fnb);
// allocate texture coordinates
FloatBuffer ftb = BufferUtils.createVector2Buffer(vertCount);
setBuffer(Type.TexCoord, 2, ftb);
// generate geometry
float inverseCircleSamples = 1.0f / circleSamples;
float inverseRadialSamples = 1.0f / radialSamples;
int i = 0;
// generate the cylinder itself
Vector3f radialAxis = new Vector3f(), torusMiddle = new Vector3f(), tempNormal = new Vector3f();
for (int circleCount = 0; circleCount < circleSamples; circleCount++) {
// compute center point on torus circle at specified angle
float circleFraction = circleCount * inverseCircleSamples;
float theta = FastMath.TWO_PI * circleFraction;
float cosTheta = FastMath.cos(theta);
float sinTheta = FastMath.sin(theta);
radialAxis.set(cosTheta, sinTheta, 0);
radialAxis.mult(outerRadius, torusMiddle);
// compute slice vertices with duplication at end point
int iSave = i;
for (int radialCount = 0; radialCount < radialSamples; radialCount++) {
float radialFraction = radialCount * inverseRadialSamples;
// in [0,1)
float phi = FastMath.TWO_PI * radialFraction;
float cosPhi = FastMath.cos(phi);
float sinPhi = FastMath.sin(phi);
tempNormal.set(radialAxis).multLocal(cosPhi);
tempNormal.z += sinPhi;
fnb.put(tempNormal.x).put(tempNormal.y).put(
tempNormal.z);
tempNormal.multLocal(innerRadius).addLocal(torusMiddle);
fpb.put(tempNormal.x).put(tempNormal.y).put(
tempNormal.z);
ftb.put(radialFraction).put(circleFraction);
i++;
}
BufferUtils.copyInternalVector3(fpb, iSave, i);
BufferUtils.copyInternalVector3(fnb, iSave, i);
ftb.put(1.0f).put(circleFraction);
i++;
}
// duplicate the cylinder ends to form a torus
for (int iR = 0; iR <= radialSamples; iR++, i++) {
BufferUtils.copyInternalVector3(fpb, iR, i);
BufferUtils.copyInternalVector3(fnb, iR, i);
BufferUtils.copyInternalVector2(ftb, iR, i);
ftb.put(i * 2 + 1, 1.0f);
}
}
private void setIndexData() {
// allocate connectivity
int triCount = 2 * circleSamples * radialSamples;
ShortBuffer sib = BufferUtils.createShortBuffer(3 * triCount);
setBuffer(Type.Index, 3, sib);
int i;
// generate connectivity
int connectionStart = 0;
int index = 0;
for (int circleCount = 0; circleCount < circleSamples; circleCount++) {
int i0 = connectionStart;
int i1 = i0 + 1;
connectionStart += radialSamples + 1;
int i2 = connectionStart;
int i3 = i2 + 1;
for (i = 0; i < radialSamples; i++, index += 6) {
// if (true) {
sib.put((short)i0++);
sib.put((short)i2);
sib.put((short)i1);
sib.put((short)i1++);
sib.put((short)i2++);
sib.put((short)i3++);
// getIndexBuffer().put(i0++);
// getIndexBuffer().put(i2);
// getIndexBuffer().put(i1);
// getIndexBuffer().put(i1++);
// getIndexBuffer().put(i2++);
// getIndexBuffer().put(i3++);
// } else {
// getIndexBuffer().put(i0++);
// getIndexBuffer().put(i1);
// getIndexBuffer().put(i2);
// getIndexBuffer().put(i1++);
// getIndexBuffer().put(i3++);
// getIndexBuffer().put(i2++);
// }
}
}
}
/**
* Rebuilds this torus based on a new set of parameters.
*
* @param circleSamples the number of samples along the circles.
* @param radialSamples the number of samples along the radial.
* @param innerRadius the radius of the inner begining of the Torus.
* @param outerRadius the radius of the outter end of the Torus.
*/
public void updateGeometry(int circleSamples, int radialSamples, float innerRadius, float outerRadius) {
this.circleSamples = circleSamples;
this.radialSamples = radialSamples;
this.innerRadius = innerRadius;
this.outerRadius = outerRadius;
setGeometryData();
setIndexData();
updateBound();
updateCounts();
}
@Override
public void write(JmeExporter e) throws IOException {
super.write(e);
OutputCapsule capsule = e.getCapsule(this);
capsule.write(circleSamples, "circleSamples", 0);
capsule.write(radialSamples, "radialSamples", 0);
capsule.write(innerRadius, "innerRadius", 0);
capsule.write(outerRadius, "outerRadius", 0);
}
}