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package ru.olamedia.math;
import com.jogamp.opengl.math.geom.AABBox;
public class Frustum {
public Plane topPlane = new Plane();
public Plane bottomPlane = new Plane();
public Plane leftPlane = new Plane();
public Plane rightPlane = new Plane();
public Plane nearPlane = new Plane();
public Plane farPlane = new Plane();
private Plane[] planes = getPlanes();
private Plane[] getPlanes() {
return new Plane[] { leftPlane, rightPlane, topPlane, bottomPlane };// ,
// topPlane,,
// topPlane
// bottomPlane,
// leftPlane,
// rightPlane, farPlane };
}
public Vector3f[] getVertices() {
Vector3f[] v = new Vector3f[8];
v[0] = topPlane.cross(leftPlane, nearPlane);
v[1] = topPlane.cross(leftPlane, farPlane);
v[2] = topPlane.cross(rightPlane, nearPlane);
v[3] = topPlane.cross(rightPlane, farPlane);
v[4] = bottomPlane.cross(leftPlane, nearPlane);
v[5] = bottomPlane.cross(leftPlane, farPlane);
v[6] = bottomPlane.cross(rightPlane, nearPlane);
v[7] = bottomPlane.cross(rightPlane, farPlane);
return v;
}
private static final boolean quickClassify(Plane p, AABBox box) {
final float[] low = box.getLow();
final float[] high = box.getHigh();
if (p.distance(low[0], low[1], low[2]) > 0.0f)
return (true);
if (p.distance(high[0], low[1], low[2]) > 0.0f)
return (true);
if (p.distance(low[0], high[1], low[2]) > 0.0f)
return (true);
if (p.distance(high[0], high[1], low[2]) > 0.0f)
return (true);
if (p.distance(low[0], low[1], high[2]) > 0.0f)
return (true);
if (p.distance(high[0], low[1], high[2]) > 0.0f)
return (true);
if (p.distance(low[0], high[1], high[2]) > 0.0f)
return (true);
if (p.distance(high[0], high[1], high[2]) > 0.0f)
return (true);
return (false);
}
/**
* Quick check to see if an orthogonal bounding box is inside the frustum
*/
public final boolean isOutside(AABBox box) {
if (!quickClassify(leftPlane, box))
return true;
// if (!quickClassify(rightPlane, box))
// return true;
// if (!quickClassify(topPlane, box))
// return true;
// if (!quickClassify(bottomPlane, box))
// return true;
// if (!quickClassify(nearPlane, box))
// return true;
// if (!quickClassify(farPlane, box))
// return true;
// We make no attempt to determine whether it's fully inside or not.
return false;
}
private static final boolean isPointInside(Plane plane, Vector3f p) {
return (plane.distance(p) <= 0.0f);
}
@SuppressWarnings("unused")
private final boolean isPointInside(Vector3f p) {
return isPointInside(topPlane, p) && isPointInside(bottomPlane, p) && isPointInside(leftPlane, p)
&& isPointInside(rightPlane, p) && isPointInside(nearPlane, p);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "Frustum[\r\n" + //
"Top " + topPlane + "\r\n" + //
"Bottom " + bottomPlane + "\r\n" + //
"Left " + leftPlane + "\r\n" + //
"Right " + rightPlane + "\r\n" + //
"Near " + nearPlane + "\r\n" + //
"Far " + farPlane + "\r\n" + //
"]";
}
}
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