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Diffstat (limited to 'tags/START/glagen/3d/misc.cc')
-rw-r--r-- | tags/START/glagen/3d/misc.cc | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/tags/START/glagen/3d/misc.cc b/tags/START/glagen/3d/misc.cc new file mode 100644 index 0000000..caf7264 --- /dev/null +++ b/tags/START/glagen/3d/misc.cc @@ -0,0 +1,43 @@ +//============================================================================= +// +// Glagen : a planet sized landscape generator +// Copyright (C) 2002 Julien Guertault, Hugues Hiegel, Meng-Tih Lam +// +// 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 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. +// +//============================================================================= +// +// Glagen : GPL LAndscape GENerator +// +// misc.cc for Glagen : made by Zavie (Julien Guertault) +// +// www.glagen.org +// +//============================================================================= + +#include <cmath> +#include "data_glagen.hh" + +// +// This function is supposed to compute very fast a good approximation +// of the distance. +// The quality of this function is very important for the frame-rate +// +float Approx_dist (float x, float y, float z) +{ + // Well, I still have to fond an approximation ^_^ + // I suppose I will use Taylor Lagrange, or something like that. + return (sqrt (x * x + y * y + z * z)); +} |