80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
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/*
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// animassist.c
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//
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// Jim Wilson 5/8/2003
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//
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// Copyright (C) 2003 Jim Wilson - jimw@kelcomaine.com
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//
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// This program is free software; you can redistribute it and/or
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// 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
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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int main( int argc, char **argv ) {
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float x1,y1,z1,x2,y2,z2 = 0;
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float center_x,center_y,center_z,axis_x,axis_y,axis_z;
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float vector_length;
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if (argc < 7) {
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printf("animassist - utility to calculate axis and center values for SimGear model animation\n\n");
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printf("Usage: animassist x1 y1 z1 x2 y2 z2\n\n");
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printf("Defining two vectors in SimGear coords (x1,y1,z1) and (x2,y2,z2)\n\n");
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printf("Conversion from model to SimGear:\n");
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printf("SimGear Coord AC3D Coordinate\n");
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printf(" X = X\n");
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printf(" Y = Z * -1\n");
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printf(" Z = Y\n\n");
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printf("Note: no normalization done, so please make the 2nd vector the furthest out\n");
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} else {
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x1 = atof(argv[1]);
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y1 = atof(argv[2]);
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z1 = atof(argv[3]);
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x2 = atof(argv[4]);
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y2 = atof(argv[5]);
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z2 = atof(argv[6]);
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center_x = (x1+x2)/2;
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center_y = (y1+y2)/2;
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center_z = (z1+z2)/2;
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vector_length = sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1) + (z2-z1)*(z2-z1));
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/* arbitrary axis defined by cos(theta) where theta is angle from x,y or z axis */
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axis_x = (x2-x1)/vector_length;
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axis_y = (y2-y1)/vector_length;
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axis_z = (z2-z1)/vector_length;
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printf("Flightgear Model XML for:\n");
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printf("Axis from (%f,%f,%f) to (%f,%f,%f)\n", x1,y1,z1,x2,y2,z2);
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printf("Assuming units in meters!\n\n");
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printf("<center>\n");
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printf(" <x-m>%f</x-m>\n",center_x);
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printf(" <y-m>%f</y-m>\n",center_y);
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printf(" <z-m>%f</z-m>\n",center_z);
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printf("</center>\n\n");
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printf("<axis>\n");
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printf(" <x>%f</x>\n",axis_x);
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printf(" <y>%f</y>\n",axis_y);
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printf(" <z>%f</z>\n",axis_z);
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printf("</axis>\n\n");
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}
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return 0;
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}
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