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package ru.olamedia.math;
public class FrustumUtil {
public static Plane[] extractPlanes(javax.vecmath.Matrix4f m, boolean normalize) {
Plane[] planes = new Plane[6];
for (int j = 0; j < 6; j++) {
planes[j] = new Plane();
}
// Left: [30+00, 31+01, 32+02, 33+03]
planes[0].n.x = m.m30 + m.m00;
planes[0].n.y = m.m31 + m.m01;
planes[0].n.z = m.m32 + m.m02;
planes[0].d = m.m33 + m.m03;
// Right: [30-00, 31-01, 32-02, 33-03]
planes[1].n.x = m.m30 - m.m00;
planes[1].n.y = m.m31 - m.m01;
planes[1].n.z = m.m32 - m.m02;
planes[1].d = m.m33 - m.m03;
// Bottom: [30+10, 31+11, 32+12, 33+13]
planes[2].n.x = m.m30 + m.m10;
planes[2].n.y = m.m31 + m.m11;
planes[2].n.z = m.m32 + m.m12;
planes[2].d = m.m33 + m.m13;
// Top: [30-10, 31-11, 32-12, 33-13]
planes[3].n.x = m.m30 - m.m10;
planes[3].n.y = m.m31 - m.m11;
planes[3].n.z = m.m32 - m.m12;
planes[3].d = m.m33 - m.m13;
// Near: [30+20, 31+21, 32+22, 33+23]
planes[4].n.x = m.m30 + m.m20;
planes[4].n.y = m.m31 + m.m21;
planes[4].n.z = m.m32 + m.m22;
planes[4].d = m.m33 + m.m23;
// Far: [30-20, 31-21, 32-22, 33-23]
planes[5].n.x = m.m30 - m.m20;
planes[5].n.y = m.m31 - m.m21;
planes[5].n.z = m.m32 - m.m22;
planes[5].d = m.m33 - m.m23;
// Normalize
if (normalize) {
for (int i = 0; i < 6; ++i) {
planes[i].normalize();
}
}
return planes;
}
public static Frustum extractFrustum(javax.vecmath.Matrix4f m) {
Frustum f = new Frustum();
Plane[] planes = extractPlanes(m, true);
f.leftPlane.set(planes[0]);
f.rightPlane.set(planes[1]);
f.bottomPlane.set(planes[2]);
f.topPlane.set(planes[3]);
f.nearPlane.set(planes[4]);
f.farPlane.set(planes[5]);
return f;
}
}
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