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Wednesday the 23rd of May 2012 @ 05:03pm

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cRFrustum.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2003 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "renderObjects/cRFrustum.h" #include "n2l/renderTools.h" #include <iostream> using namespace std; /******************************************************************************/ namespace n2l { /**************************************************************************/ cRFrustum::cRFrustum() { tMatrix44f identMatrix; identMatrix.identity(); set( identMatrix,identMatrix ); } /**************************************************************************/ cRFrustum::cRFrustum( const tMatrix44f &iProjectionMatrix, const tMatrix44f &iModelViewMatrix ) { set( iProjectionMatrix, iModelViewMatrix ); } /**************************************************************************/ cRFrustum::cRFrustum( const cRFrustum &iFrustum ) { *this = iFrustum; } /**************************************************************************/ cRFrustum::~cRFrustum() { } /**************************************************************************/ void cRFrustum::set( const tMatrix44f &iProjectionMatrix, const tMatrix44f &iModelViewMatrix ) { // Keep these around for project calls we might want // to do later. Bah, it's only 32 floats. mProj = iProjectionMatrix; mModel = iModelViewMatrix; tMatrix44f combo; iProjectionMatrix.multiply( combo, iModelViewMatrix ); // Extract the clipping planes mPlane[ ClipPlane_Right ].set( combo[3] - combo[0], combo[7] - combo[4], combo[11] - combo[8], combo[15] - combo[12] ); mPlane[ ClipPlane_Right ].normalize(); mPlane[ ClipPlane_Left ].set( combo[3] + combo[0], combo[7] + combo[4], combo[11] + combo[8], combo[15] + combo[12] ); mPlane[ ClipPlane_Left ].normalize(); mPlane[ ClipPlane_Bottom ].set( combo[3] + combo[1], combo[7] + combo[5], combo[11] + combo[9], combo[15] + combo[13] ); mPlane[ ClipPlane_Bottom ].normalize(); mPlane[ ClipPlane_Top ].set( combo[3] - combo[1], combo[7] - combo[5], combo[11] - combo[9], combo[15] - combo[13] ); mPlane[ ClipPlane_Top ].normalize(); mPlane[ ClipPlane_Far ].set( combo[3] - combo[2], combo[7] - combo[6], combo[11] - combo[10], combo[15] - combo[14] ); mPlane[ ClipPlane_Far ].normalize(); mPlane[ ClipPlane_Near ].set( combo[3] + combo[2], combo[7] + combo[6], combo[11] + combo[10], combo[15] + combo[14] ); mPlane[ ClipPlane_Near ].normalize(); } /**************************************************************************/ cRFrustum &cRFrustum::operator =( const cRFrustum &iFrustum ) { mProj = iFrustum.mProj; mModel = iFrustum.mModel; for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) mPlane[i] = iFrustum.mPlane[i]; return *this; } /**************************************************************************/ const tBool cRFrustum::testSphere( const tVector3f &iCenter, const tFloat &iRadius ) const { for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) if (mPlane[i].normal().dot(iCenter) + mPlane[i].d()<-iRadius) return false; return true; } /**************************************************************************/ const tBool cRFrustum::testSphere( const tVector3f &iCenter, const tFloat &iRadius, const tUint &iMask ) const { for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) { switch (i) { case ClipPlane_Right: if (iMask&ClipPlaneMask_Right) continue; break; case ClipPlane_Left: if (iMask&ClipPlaneMask_Left) continue; break; case ClipPlane_Bottom: if (iMask&ClipPlaneMask_Bottom) continue; break; case ClipPlane_Top: if (iMask&ClipPlaneMask_Top) continue; break; case ClipPlane_Far: if (iMask&ClipPlaneMask_Far) continue; break; case ClipPlane_Near: if (iMask&ClipPlaneMask_Near) continue; break; } if (mPlane[i].normal().dot(iCenter) + mPlane[i].d()<-iRadius) return false; } return true; } /**************************************************************************/ const tBool cRFrustum::testAABox( const tVector3f &mC, const tVector3f &mDistance ) const { const tVector3f hd( mDistance*0.5f ); for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) { if (mPlane[i].pointInFront(tVector3f( mC.x()+hd.x(), mC.y()+hd.y(), mC.z()+hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()-hd.x(), mC.y()+hd.y(), mC.z()+hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()+hd.x(), mC.y()-hd.y(), mC.z()+hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()-hd.x(), mC.y()-hd.y(), mC.z()+hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()+hd.x(), mC.y()+hd.y(), mC.z()-hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()-hd.x(), mC.y()+hd.y(), mC.z()-hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()+hd.x(), mC.y()-hd.y(), mC.z()-hd.z()))) continue; if (mPlane[i].pointInFront(tVector3f( mC.x()-hd.x(), mC.y()-hd.y(), mC.z()-hd.z()))) continue; // Isn't visible. return false; } return true; } /**************************************************************************/ const tBool cRFrustum::testPoint( const tVector3f &mPoint ) const { for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) { if (mPlane[i].pointInFront(mPoint)) continue; return false; } return true; } /**************************************************************************/ const tBool cRFrustum::testQuad( const tVector3f &m0, const tVector3f &m1, const tVector3f &m2, const tVector3f &m3 ) const { for (tUint i=0; i<ClipPlane_NumClipPlanes; ++i) { if (mPlane[i].pointInFront(m0)) continue; if (mPlane[i].pointInFront(m1)) continue; if (mPlane[i].pointInFront(m2)) continue; if (mPlane[i].pointInFront(m3)) continue; // Isn't visible. return false; } return true; } /**************************************************************************/ void cRFrustum::halfNearFarVectorBase( tVector3f &oBottomLeftPos, tVector3f &oRightDir, tVector3f &oUpDir ) const { tVector3f nearBL = mPlane[ClipPlane_Near].intersect( mPlane[ClipPlane_Left], mPlane[ClipPlane_Bottom] ); tVector3f nearBR = mPlane[ClipPlane_Near].intersect( mPlane[ClipPlane_Right], mPlane[ClipPlane_Bottom] ); tVector3f nearTL = mPlane[ClipPlane_Near].intersect( mPlane[ClipPlane_Left], mPlane[ClipPlane_Top] ); tVector3f farBL = mPlane[ClipPlane_Far].intersect( mPlane[ClipPlane_Left], mPlane[ClipPlane_Bottom] ); tVector3f farBR = mPlane[ClipPlane_Far].intersect( mPlane[ClipPlane_Right], mPlane[ClipPlane_Bottom] ); tVector3f farTL = mPlane[ClipPlane_Far].intersect( mPlane[ClipPlane_Left], mPlane[ClipPlane_Top] ); oBottomLeftPos = nearBL + (farBL-nearBL)*0.5f; oRightDir = (nearBR-nearBL) + ( (farBR-farBL)-(nearBR-nearBL) )*0.5f; oUpDir = (nearTL-nearBL) + ( (farTL-farBL)-(nearTL-nearBL) )*0.5f; } /**************************************************************************/ void cRFrustum::projectPoint( tVector3f &oPos, const tVector3f &iPos ) const { tFloat objC[4] = { iPos[0],iPos[1],iPos[2], 1.0f }; tFloat eyeC[4]; tFloat clipC[4]; mModel.multiply( eyeC, objC ); mProj.multiply( clipC, eyeC ); oPos.x( clipC[0]/clipC[3] ); oPos.y( clipC[1]/clipC[3] ); oPos.z( clipC[2]/clipC[3] ); oPos *= 0.5f; oPos += 0.5f; } } // namespace

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