//
// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
//
-// 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.
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
//
-// This program is distributed in the hope that it will be useful, but
-// WITHOUT ANY WARRANTY; without even the implied warranty of
+// 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
-// General Public License for more details.
+// Library 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+// You should have received a copy of the GNU Library 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.
//
// $Id$
const sgVec3 d ) {
sgVec3 u, u1, v;
- double ud, dd, tmp;
// u = p - p0
sgSubVec3(u, p, p0);
// calculate the projection, u1, of u along d.
// u1 = ( dot_prod(u, d) / dot_prod(d, d) ) * d;
- ud = sgScalarProductVec3(u, d);
- dd = sgScalarProductVec3(d, d);
- tmp = ud / dd;
-
- sgScaleVec3(u1, d, tmp);;
+ sgScaleVec3( u1, d, sgScalarProductVec3(u,d) / sgScalarProductVec3(d,d) );
// v = u - u1 = vector from closest point on line, p1, to the
// original point, p.
return ( sgdScalarProductVec3(v, v) );
}
+
+
+// This is a quicker form of
+// sgMakeMatTrans4( sgMat4 sgTrans, sgVec3 trans )
+// sgPostMultMat4( sgMat, sgTRANS );
+void sgPostMultMat4ByTransMat4( sgMat4 src, const sgVec3 trans )
+{
+ for( int i=0; i<4; i++) {
+ for( int j=0; j<3; j++ ) {
+ src[i][j] += (src[i][3] * trans[j]);
+ }
+ }
+}
+
+