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Diffstat (limited to 'source/gameengine/Rasterizer/RAS_texmatrix.cpp')
| -rw-r--r-- | source/gameengine/Rasterizer/RAS_texmatrix.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/source/gameengine/Rasterizer/RAS_texmatrix.cpp b/source/gameengine/Rasterizer/RAS_texmatrix.cpp new file mode 100644 index 00000000000..515f05b8303 --- /dev/null +++ b/source/gameengine/Rasterizer/RAS_texmatrix.cpp @@ -0,0 +1,133 @@ +/** + * $Id$ + * ***** BEGIN GPL/BL DUAL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL/BL DUAL LICENSE BLOCK ***** + */ + + + +#include "RAS_TexMatrix.h" + + +void RAS_CalcTexMatrix(RAS_TexVert p[3],MT_Point3& origin,MT_Vector3& udir,MT_Vector3& vdir) +{ +// precondition: 3 vertices are non-colinear + + MT_Vector3 vec1 = p[1].xyz()-p[0].xyz(); + MT_Vector3 vec2 = p[2].xyz()-p[0].xyz(); + MT_Vector3 normal = vec1.cross(vec2); + normal.normalize(); + + // determine which coordinate we drop, ie. max coordinate in the normal + + + int ZCOORD = normal.closestAxis(); + int XCOORD = (ZCOORD+1)%3; + int YCOORD = (ZCOORD+2)%3; + + // ax+by+cz+d=0 + MT_Scalar d = -p[0].xyz().dot(normal); + + + MT_Matrix3x3 mat3( p[0].getUV1()[0],p[0].getUV1()[1], 1, + p[1].getUV1()[0],p[1].getUV1()[1], 1, + p[2].getUV1()[0],p[2].getUV1()[1], 1); + + + MT_Matrix3x3 mat3inv = mat3.inverse(); + + MT_Vector3 p123x(p[0].xyz()[XCOORD],p[1].xyz()[XCOORD],p[2].xyz()[XCOORD]); + MT_Vector3 resultx = mat3inv*p123x; + MT_Vector3 p123y(p[0].xyz()[YCOORD],p[1].xyz()[YCOORD],p[2].xyz()[YCOORD]); + MT_Vector3 resulty = mat3inv*p123y; + + // normal[ZCOORD] is not zero, because it's chosen to be maximal (absolute), and normal has length 1, + // so at least on of the coords is <> 0 + + //droppedvalue udir.dot(normal) =0 + MT_Scalar droppedu = -(resultx.x()*normal[XCOORD]+resulty.x()*normal[YCOORD])/normal[ZCOORD]; + udir[XCOORD] = resultx.x(); + udir[YCOORD] = resulty.x(); + udir[ZCOORD] = droppedu; + MT_Scalar droppedv = -(resultx.y()*normal[XCOORD]+resulty.y()*normal[YCOORD])/normal[ZCOORD]; + vdir[XCOORD] = resultx.y(); + vdir[YCOORD] = resulty.y(); + vdir[ZCOORD] = droppedv; + // droppedvalue b = -(ax+cz+d)/y; + MT_Scalar droppedvalue = -((resultx.z()*normal[XCOORD] + resulty.z()*normal[YCOORD]+d))/normal[ZCOORD]; + origin[XCOORD] = resultx.z(); + origin[YCOORD] = resulty.z(); + origin[ZCOORD] = droppedvalue; + + +} + +#ifdef _TEXOWNMAIN + +int main() +{ + + MT_Point2 puv0={0,0}; + MT_Point3 pxyz0 (0,0,128); + + MT_Scalar puv1[2]={1,0}; + MT_Point3 pxyz1(128,0,128); + + MT_Scalar puv2[2]={1,1}; + MT_Point3 pxyz2(128,0,0); + + RAS_TexVert p0(pxyz0,puv0); + RAS_TexVert p1(pxyz1,puv1); + RAS_TexVert p2(pxyz2,puv2); + + RAS_TexVert vertices[3] = + { + p0, + p1, + p2 + }; + + MT_Vector3 udir,vdir; + MT_Point3 origin; + CalcTexMatrix(vertices,origin,udir,vdir); + + MT_Point3 testpoint(128,32,64); + + MT_Scalar lenu = udir.length2(); + MT_Scalar lenv = vdir.length2(); + + MT_Scalar testu=((pxyz2-origin).dot(udir))/lenu; + MT_Scalar testv=((pxyz2-origin).dot(vdir))/lenv; + + + + + return 0; +} + +#endif // _TEXOWNMAIN |