/*
* Copyright (c) 2009-2012 jMonkeyEngine
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*
* * Redistributions in binary form must reproduce the above copyright
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* may be used to endorse or promote products derived from this software
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// $Id: Sphere.java 4163 2009-03-25 01:14:55Z matt.yellen $
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 com.jme3.util.TempVars;
import java.io.IOException;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;
/**
* <code>Sphere</code> represents a 3D object with all points equidistance
* from a center point.
*
* @author Joshua Slack
* @version $Revision: 4163 $, $Date: 2009-03-24 21:14:55 -0400 (Tue, 24 Mar 2009) $
*/
public class Sphere extends Mesh {
public enum TextureMode {
/**
* Wrap texture radially and along z-axis
*/
Original,
/**
* Wrap texure radially, but spherically project along z-axis
*/
Projected,
/**
* Apply texture to each pole. Eliminates polar distortion,
* but mirrors the texture across the equator
*/
Polar
}
protected int vertCount;
protected int triCount;
protected int zSamples;
protected int radialSamples;
protected boolean useEvenSlices;
protected boolean interior;
/** the distance from the center point each point falls on */
public float radius;
protected TextureMode textureMode = TextureMode.Original;
/**
* Serialization only. Do not use.
*/
public Sphere() {
}
/**
* Constructs a sphere. All geometry data buffers are updated automatically.
* Both zSamples and radialSamples increase the quality of the generated
* sphere.
*
* @param zSamples
* The number of samples along the Z.
* @param radialSamples
* The number of samples along the radial.
* @param radius
* The radius of the sphere.
*/
public Sphere(int zSamples, int radialSamples, float radius) {
this(zSamples, radialSamples, radius, false, false);
}
/**
* Constructs a sphere. Additional arg to evenly space latitudinal slices
*
* @param zSamples
* The number of samples along the Z.
* @param radialSamples
* The number of samples along the radial.
* @param radius
* The radius of the sphere.
* @param useEvenSlices
* Slice sphere evenly along the Z axis
* @param interior
* Not yet documented
*/
public Sphere(int zSamples, int radialSamples, float radius, boolean useEvenSlices, boolean interior) {
updateGeometry(zSamples, radialSamples, radius, useEvenSlices, interior);
}
public int getRadialSamples() {
return radialSamples;
}
public float getRadius() {
return radius;
}
/**
* @return Returns the textureMode.
*/
public TextureMode getTextureMode() {
return textureMode;
}
public int getZSamples() {
return zSamples;
}
/**
* builds the vertices based on the radius, radial and zSamples.
*/
private void setGeometryData() {
// allocate vertices
vertCount = (zSamples - 2) * (radialSamples + 1) + 2;
FloatBuffer posBuf = BufferUtils.createVector3Buffer(vertCount);
// allocate normals if requested
FloatBuffer normBuf = BufferUtils.createVector3Buffer(vertCount);
// allocate texture coordinates
FloatBuffer texBuf = BufferUtils.createVector2Buffer(vertCount);
setBuffer(Type.Position, 3, posBuf);
setBuffer(Type.Normal, 3, normBuf);
setBuffer(Type.TexCoord, 2, texBuf);
// generate geometry
float fInvRS = 1.0f / radialSamples;
float fZFactor = 2.0f / (zSamples - 1);
// Generate points on the unit circle to be used in computing the mesh
// points on a sphere slice.
float[] afSin = new float[(radialSamples + 1)];
float[] afCos = new float[(radialSamples + 1)];
for (int iR = 0; iR < radialSamples; iR++) {
float fAngle = FastMath.TWO_PI * fInvRS * iR;
afCos[iR] = FastMath.cos(fAngle);
afSin[iR] = FastMath.sin(fAngle);
}
afSin[radialSamples] = afSin[0];
afCos[radialSamples] = afCos[0];
TempVars vars = TempVars.get();
Vector3f tempVa = vars.vect1;
Vector3f tempVb = vars.vect2;
Vector3f tempVc = vars.vect3;
// generate the sphere itself
int i = 0;
for (int iZ = 1; iZ < (zSamples - 1); iZ++) {
float fAFraction = FastMath.HALF_PI * (-1.0f + fZFactor * iZ); // in (-pi/2, pi/2)
float fZFraction;
if (useEvenSlices) {
fZFraction = -1.0f + fZFactor * iZ; // in (-1, 1)
} else {
fZFraction = FastMath.sin(fAFraction); // in (-1,1)
}
float fZ = radius * fZFraction;
// compute center of slice
Vector3f kSliceCenter = tempVb.set(Vector3f.ZERO);
kSliceCenter.z += fZ;
// compute radius of slice
float fSliceRadius = FastMath.sqrt(FastMath.abs(radius * radius
- fZ * fZ));
// compute slice vertices with duplication at end point
Vector3f kNormal;
int iSave = i;
for (int iR = 0; iR < radialSamples; iR++) {
float fRadialFraction = iR * fInvRS; // in [0,1)
Vector3f kRadial = tempVc.set(afCos[iR], afSin[iR], 0);
kRadial.mult(fSliceRadius, tempVa);
posBuf.put(kSliceCenter.x + tempVa.x).put(
kSliceCenter.y + tempVa.y).put(
kSliceCenter.z + tempVa.z);
BufferUtils.populateFromBuffer(tempVa, posBuf, i);
kNormal = tempVa;
kNormal.normalizeLocal();
if (!interior) // allow interior texture vs. exterior
{
normBuf.put(kNormal.x).put(kNormal.y).put(
kNormal.z);
} else {
normBuf.put(-kNormal.x).put(-kNormal.y).put(
-kNormal.z);
}
if (textureMode == TextureMode.Original) {
texBuf.put(fRadialFraction).put(
0.5f * (fZFraction + 1.0f));
} else if (textureMode == TextureMode.Projected) {
texBuf.put(fRadialFraction).put(
FastMath.INV_PI
* (FastMath.HALF_PI + FastMath.asin(fZFraction)));
} else if (textureMode == TextureMode.Polar) {
float r = (FastMath.HALF_PI - FastMath.abs(fAFraction)) / FastMath.PI;
float u = r * afCos[iR] + 0.5f;
float v = r * afSin[iR] + 0.5f;
texBuf.put(u).put(v);
}
i++;
}
BufferUtils.copyInternalVector3(posBuf, iSave, i);
BufferUtils.copyInternalVector3(normBuf, iSave, i);
if (textureMode == TextureMode.Original) {
texBuf.put(1.0f).put(
0.5f * (fZFraction + 1.0f));
} else if (textureMode == TextureMode.Projected) {
texBuf.put(1.0f).put(
FastMath.INV_PI
* (FastMath.HALF_PI + FastMath.asin(fZFraction)));
} else if (textureMode == TextureMode.Polar) {
float r = (FastMath.HALF_PI - FastMath.abs(fAFraction)) / FastMath.PI;
texBuf.put(r + 0.5f).put(0.5f);
}
i++;
}
vars.release();
// south pole
posBuf.position(i * 3);
posBuf.put(0f).put(0f).put(-radius);
normBuf.position(i * 3);
if (!interior) {
normBuf.put(0).put(0).put(-1); // allow for inner
} // texture orientation
// later.
else {
normBuf.put(0).put(0).put(1);
}
texBuf.position(i * 2);
if (textureMode == TextureMode.Polar) {
texBuf.put(0.5f).put(0.5f);
} else {
texBuf.put(0.5f).put(0.0f);
}
i++;
// north pole
posBuf.put(0).put(0).put(radius);
if (!interior) {
normBuf.put(0).put(0).put(1);
} else {
normBuf.put(0).put(0).put(-1);
}
if (textureMode == TextureMode.Polar) {
texBuf.put(0.5f).put(0.5f);
} else {
texBuf.put(0.5f).put(1.0f);
}
updateBound();
}
/**
* sets the indices for rendering the sphere.
*/
private void setIndexData() {
// allocate connectivity
triCount = 2 * (zSamples - 2) * radialSamples;
ShortBuffer idxBuf = BufferUtils.createShortBuffer(3 * triCount);
setBuffer(Type.Index, 3, idxBuf);
// generate connectivity
int index = 0;
for (int iZ = 0, iZStart = 0; iZ < (zSamples - 3); iZ++) {
int i0 = iZStart;
int i1 = i0 + 1;
iZStart += (radialSamples + 1);
int i2 = iZStart;
int i3 = i2 + 1;
for (int i = 0; i < radialSamples; i++, index += 6) {
if (!interior) {
idxBuf.put((short) i0++);
idxBuf.put((short) i1);
idxBuf.put((short) i2);
idxBuf.put((short) i1++);
idxBuf.put((short) i3++);
idxBuf.put((short) i2++);
} else { // inside view
idxBuf.put((short) i0++);
idxBuf.put((short) i2);
idxBuf.put((short) i1);
idxBuf.put((short) i1++);
idxBuf.put((short) i2++);
idxBuf.put((short) i3++);
}
}
}
// south pole triangles
for (int i = 0; i < radialSamples; i++, index += 3) {
if (!interior) {
idxBuf.put((short) i);
idxBuf.put((short) (vertCount - 2));
idxBuf.put((short) (i + 1));
} else { // inside view
idxBuf.put((short) i);
idxBuf.put((short) (i + 1));
idxBuf.put((short) (vertCount - 2));
}
}
// north pole triangles
int iOffset = (zSamples - 3) * (radialSamples + 1);
for (int i = 0; i < radialSamples; i++, index += 3) {
if (!interior) {
idxBuf.put((short) (i + iOffset));
idxBuf.put((short) (i + 1 + iOffset));
idxBuf.put((short) (vertCount - 1));
} else { // inside view
idxBuf.put((short) (i + iOffset));
idxBuf.put((short) (vertCount - 1));
idxBuf.put((short) (i + 1 + iOffset));
}
}
}
/**
* @param textureMode
* The textureMode to set.
*/
public void setTextureMode(TextureMode textureMode) {
this.textureMode = textureMode;
setGeometryData();
}
/**
* Changes the information of the sphere into the given values.
*
* @param zSamples the number of zSamples of the sphere.
* @param radialSamples the number of radial samples of the sphere.
* @param radius the radius of the sphere.
*/
public void updateGeometry(int zSamples, int radialSamples, float radius) {
if (zSamples < 3) {
throw new IllegalArgumentException("zSamples cannot be smaller than 3");
}
updateGeometry(zSamples, radialSamples, radius, false, false);
}
public void updateGeometry(int zSamples, int radialSamples, float radius, boolean useEvenSlices, boolean interior) {
if (zSamples < 3) {
throw new IllegalArgumentException("zSamples cannot be smaller than 3");
}
this.zSamples = zSamples;
this.radialSamples = radialSamples;
this.radius = radius;
this.useEvenSlices = useEvenSlices;
this.interior = interior;
setGeometryData();
setIndexData();
setStatic();
}
public void read(JmeImporter e) throws IOException {
super.read(e);
InputCapsule capsule = e.getCapsule(this);
zSamples = capsule.readInt("zSamples", 0);
radialSamples = capsule.readInt("radialSamples", 0);
radius = capsule.readFloat("radius", 0);
useEvenSlices = capsule.readBoolean("useEvenSlices", false);
textureMode = capsule.readEnum("textureMode", TextureMode.class, TextureMode.Original);
interior = capsule.readBoolean("interior", false);
}
public void write(JmeExporter e) throws IOException {
super.write(e);
OutputCapsule capsule = e.getCapsule(this);
capsule.write(zSamples, "zSamples", 0);
capsule.write(radialSamples, "radialSamples", 0);
capsule.write(radius, "radius", 0);
capsule.write(useEvenSlices, "useEvenSlices", false);
capsule.write(textureMode, "textureMode", TextureMode.Original);
capsule.write(interior, "interior", false);
}
}