llplane.h
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- /**
- * @file llplane.h
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #ifndef LL_LLPLANE_H
- #define LL_LLPLANE_H
- #include "v3math.h"
- #include "v4math.h"
- // A simple way to specify a plane is to give its normal,
- // and it's nearest approach to the origin.
- //
- // Given the equation for a plane : A*x + B*y + C*z + D = 0
- // The plane normal = [A, B, C]
- // The closest approach = D / sqrt(A*A + B*B + C*C)
- class LLPlane : public LLVector4
- {
- public:
- LLPlane() {}; // no default constructor
- LLPlane(const LLVector3 &p0, F32 d) { setVec(p0, d); }
- LLPlane(const LLVector3 &p0, const LLVector3 &n) { setVec(p0, n); }
- void setVec(const LLVector3 &p0, F32 d) { LLVector4::setVec(p0[0], p0[1], p0[2], d); }
- void setVec(const LLVector3 &p0, const LLVector3 &n)
- {
- F32 d = -(p0 * n);
- setVec(n, d);
- }
- void setVec(const LLVector3 &p0, const LLVector3 &p1, const LLVector3 &p2)
- {
- LLVector3 u, v, w;
- u = p1 - p0;
- v = p2 - p0;
- w = u % v;
- w.normVec();
- F32 d = -(w * p0);
- setVec(w, d);
- }
- LLPlane& operator=(const LLVector4& v2) { LLVector4::setVec(v2[0],v2[1],v2[2],v2[3]); return *this;}
- F32 dist(const LLVector3 &v2) const { return mV[0]*v2[0] + mV[1]*v2[1] + mV[2]*v2[2] + mV[3]; }
- };
- #endif // LL_LLPLANE_H