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https://github.com/UberGames/lilium-voyager.git
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52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "qbsp.h"
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// global flag
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int g_bBrushPrimit;
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// NOTE : ComputeAxisBase here and in editor code must always BE THE SAME !
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// WARNING : special case behaviour of atan2(y,x) <-> atan(y/x) might not be the same everywhere when x == 0
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// rotation by (0,RotY,RotZ) assigns X to normal
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void ComputeAxisBase(vec3_t normal,vec3_t texX,vec3_t texY)
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{
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vec_t RotY,RotZ;
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// do some cleaning
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if (fabs(normal[0])<1e-6)
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normal[0]=0.0f;
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if (fabs(normal[1])<1e-6)
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normal[1]=0.0f;
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if (fabs(normal[2])<1e-6)
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normal[2]=0.0f;
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// compute the two rotations around Y and Z to rotate X to normal
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RotY=-atan2(normal[2],sqrt(normal[1]*normal[1]+normal[0]*normal[0]));
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RotZ=atan2(normal[1],normal[0]);
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// rotate (0,1,0) and (0,0,1) to compute texX and texY
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texX[0]=-sin(RotZ);
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texX[1]=cos(RotZ);
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texX[2]=0;
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// the texY vector is along -Z ( T texture coorinates axis )
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texY[0]=-sin(RotY)*cos(RotZ);
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texY[1]=-sin(RotY)*sin(RotZ);
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texY[2]=-cos(RotY);
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}
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