74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/**
|
|
* @file llplane.h
|
|
*
|
|
* $LicenseInfo:firstyear=2001&license=viewergpl$
|
|
*
|
|
* Copyright (c) 2001-2009, 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
|