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Java implementation of BSP based CSG (Constructive Solid Geometry)
/**
* Sphere.java
*
* Copyright 2014-2014 Michael Hoffer . All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY Michael Hoffer "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 Michael Hoffer 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.
*
* The views and conclusions contained in the software and documentation are
* those of the authors and should not be interpreted as representing official
* policies, either expressed or implied, of Michael Hoffer
* .
*/
package eu.mihosoft.vrl.v3d;
import java.util.ArrayList;
import java.util.List;
/**
* A solid sphere.
*
* Tthe tessellation along the longitude and latitude directions can be
* controlled via the {@link #numSlices} and {@link #numStacks} parameters.
*
* @author Michael Hoffer <[email protected]>
*/
public class Sphere implements Primitive {
private Vector3d center;
private double radius;
private int numSlices;
private int numStacks;
private final PropertyStorage properties = new PropertyStorage();
/**
* Constructor. Creates a sphere with radius 1, 16 slices and 8 stacks and
* center [0,0,0].
*
*/
public Sphere() {
init();
}
/**
* Constructor. Creates a sphere with the specified radius, 16 slices and 8
* stacks and center [0,0,0].
*
* @param radius sphare radius
*/
public Sphere(double radius) {
init();
this.radius = radius;
}
/**
* Constructor. Creates a sphere with the specified radius, number of slices
* and stacks.
*
* @param radius sphare radius
* @param numSlices number of slices
* @param numStacks number of stacks
*/
public Sphere(double radius, int numSlices, int numStacks) {
init();
this.radius = radius;
this.numSlices = numSlices;
this.numStacks = numStacks;
}
/**
* Constructor. Creates a sphere with the specified center, radius, number
* of slices and stacks.
*
* @param center center of the sphere
* @param radius sphere radius
* @param numSlices number of slices
* @param numStacks number of stacks
*/
public Sphere(Vector3d center, double radius, int numSlices, int numStacks) {
this.center = center;
this.radius = radius;
this.numSlices = numSlices;
this.numStacks = numStacks;
}
private void init() {
center = new Vector3d(0, 0, 0);
radius = 1;
numSlices = 16;
numStacks = 8;
}
private Vertex sphereVertex(Vector3d c, double r, double theta, double phi) {
theta *= Math.PI * 2;
phi *= Math.PI;
Vector3d dir = new Vector3d(
Math.cos(theta) * Math.sin(phi),
Math.cos(phi),
Math.sin(theta) * Math.sin(phi)
);
return new Vertex(c.plus(dir.times(r)), dir);
}
@Override
public List toPolygons() {
List polygons = new ArrayList<>();
for (int i = 0; i < numSlices; i++) {
for (int j = 0; j < numStacks; j++) {
final List vertices = new ArrayList<>();
vertices.add(
sphereVertex(center, radius, i / (double) numSlices,
j / (double) numStacks)
);
if (j > 0) {
vertices.add(
sphereVertex(center, radius, (i + 1) / (double) numSlices,
j / (double) numStacks)
);
}
if (j < numStacks - 1) {
vertices.add(
sphereVertex(center, radius, (i + 1) / (double) numSlices,
(j + 1) / (double) numStacks)
);
}
vertices.add(
sphereVertex(center, radius, i / (double) numSlices,
(j + 1) / (double) numStacks)
);
polygons.add(new Polygon(vertices, getProperties()));
}
}
return polygons;
}
/**
* @return the center
*/
public Vector3d getCenter() {
return center;
}
/**
* @param center the center to set
*/
public void setCenter(Vector3d center) {
this.center = center;
}
/**
* @return the radius
*/
public double getRadius() {
return radius;
}
/**
* @param radius the radius to set
*/
public void setRadius(double radius) {
this.radius = radius;
}
/**
* @return the numSlices
*/
public int getNumSlices() {
return numSlices;
}
/**
* @param numSlices the numSlices to set
*/
public void setNumSlices(int numSlices) {
this.numSlices = numSlices;
}
/**
* @return the numStacks
*/
public int getNumStacks() {
return numStacks;
}
/**
* @param numStacks the numStacks to set
*/
public void setNumStacks(int numStacks) {
this.numStacks = numStacks;
}
@Override
public PropertyStorage getProperties() {
return properties;
}
}