105 lines
3.0 KiB
C++
105 lines
3.0 KiB
C++
/**
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* @file llplane.h
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*
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* $LicenseInfo:firstyear=2001&license=viewergpl$
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*
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* Copyright (c) 2001-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLPLANE_H
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#define LL_LLPLANE_H
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#include "v3math.h"
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#include "v4math.h"
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// A simple way to specify a plane is to give its normal,
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// and it's nearest approach to the origin.
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//
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// Given the equation for a plane : A*x + B*y + C*z + D = 0
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// The plane normal = [A, B, C]
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// The closest approach = D / sqrt(A*A + B*B + C*C)
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class LLPlane : public LLVector4
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{
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public:
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LLPlane() {}; // no default constructor
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LLPlane(const LLVector3 &p0, F32 d) { setVec(p0, d); }
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LLPlane(const LLVector3 &p0, const LLVector3 &n) { setVec(p0, n); }
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inline void setVec(const LLVector3 &p0, F32 d) { LLVector4::setVec(p0[0], p0[1], p0[2], d); }
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inline void setVec(const LLVector3 &p0, const LLVector3 &n)
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{
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F32 d = -(p0 * n);
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setVec(n, d);
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}
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inline void setVec(const LLVector3 &p0, const LLVector3 &p1, const LLVector3 &p2)
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{
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LLVector3 u, v, w;
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u = p1 - p0;
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v = p2 - p0;
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w = u % v;
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w.normVec();
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F32 d = -(w * p0);
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setVec(w, d);
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}
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inline LLPlane& operator=(const LLVector4& v2) { LLVector4::setVec(v2[0],v2[1],v2[2],v2[3]); return *this;}
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inline void set(const LLPlane& p2) { LLVector4::setVec(p2); }
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//
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F32 dist(const LLVector3 &v2) const { return mV[0]*v2[0] + mV[1]*v2[1] + mV[2]*v2[2] + mV[3]; }
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// reset the vector to 0, 0, 0, 1
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inline void clear() { LLVector4::setVec(0, 0, 0, 1); }
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inline void getVector3(LLVector3& vec) const { vec.set(mV[0], mV[1], mV[2]); }
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// Retrieve the mask indicating which of the x, y, or z axis are greater or equal to zero.
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inline U8 calcPlaneMask() const
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{
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U8 mask = 0;
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if (mV[0] >= 0)
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{
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mask |= 1;
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}
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if (mV[1] >= 0)
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{
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mask |= 2;
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}
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if (mV[2] >= 0)
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{
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mask |= 4;
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}
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return mask;
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}
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};
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#endif // LL_LLPLANE_H
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