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Scenery/obj.c
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Scenery/obj.c
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/**************************************************************************
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* obj.c -- routines to handle WaveFront .obj format files.
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*
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* Written by Curtis Olson, started October 1997.
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*
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* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.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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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#ifdef WIN32
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# include <windows.h>
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#endif
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#include <stdio.h>
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#include <GL/glut.h>
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#include "obj.h"
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#include "../constants.h"
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#include "../types.h"
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#include "../Math/fg_geodesy.h"
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#include "../Math/polar.h"
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#define MAXNODES 100000
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float nodes[MAXNODES][3];
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/* convert a geodetic point lon(arcsec), lat(arcsec), elev(meter) to
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* a cartesian point */
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struct fgCartesianPoint geod_to_cart(float geod[3]) {
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struct fgCartesianPoint p;
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double gc_lon, gc_lat, sl_radius;
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printf("A geodetic point is (%.2f, %.2f, %.2f)\n",
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geod[0], geod[1], geod[2]);
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gc_lon = geod[0]*ARCSEC_TO_RAD;
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fgGeodToGeoc(geod[1]*ARCSEC_TO_RAD, geod[2], &sl_radius, &gc_lat);
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printf("A geocentric point is (%.2f, %.2f, %.2f)\n", gc_lon,
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gc_lat, sl_radius+geod[2]);
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p = fgPolarToCart(gc_lon, gc_lat, sl_radius+geod[2]);
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printf("A cart point is (%.8f, %.8f, %.8f)\n", p.x, p.y, p.z);
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return(p);
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}
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/* Load a .obj file and generate the GL call list */
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GLint fgObjLoad(char *path) {
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char line[256];
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static GLfloat color[4] = { 0.5, 0.5, 0.25, 1.0 };
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struct fgCartesianPoint p1, p2, p3;
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GLint area;
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FILE *f;
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int first, ncount, n1, n2, n3;
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if ( (f = fopen(path, "r")) == NULL ) {
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printf("Cannot open file: %s\n", path);
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exit(-1);
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}
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area = glGenLists(1);
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glNewList(area, GL_COMPILE);
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/* glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color ); */
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glColor3fv(color);
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glBegin(GL_TRIANGLE_STRIP);
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first = 1;
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ncount = 1;
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while ( fgets(line, 250, f) != NULL ) {
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if ( line[0] == '#' ) {
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/* comment -- ignore */
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} else if ( line[0] == 'v' ) {
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/* node (vertex) */
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if ( ncount < MAXNODES ) {
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printf("vertex = %s", line);
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sscanf(line, "v %f %f %f\n",
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&nodes[ncount][0], &nodes[ncount][1], &nodes[ncount][2]);
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ncount++;
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} else {
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printf("Read too many nodes ... dying :-(\n");
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exit(-1);
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}
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} else if ( line[0] == 't' ) {
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/* start a new triangle strip */
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if ( !first ) {
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/* close out the previous structure and start the next */
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first = 0;
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glEnd();
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glBegin(GL_TRIANGLE_STRIP);
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}
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printf("new tri strip = %s", line);
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sscanf(line, "t %d %d %d\n", &n1, &n2, &n3);
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p1 = geod_to_cart(nodes[n1]);
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p2 = geod_to_cart(nodes[n2]);
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p3 = geod_to_cart(nodes[n3]);
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} else if ( line[0] == 'q' ) {
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/* continue a triangle strip */
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n1 = n2 = 0;
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printf("continued tri strip = %s", line);
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sscanf(line, "q %d %d\n", &n1, &n2);
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printf("read %d %d\n", n1, n2);
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} else {
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printf("Unknown line in %s = %s\n", path, line);
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}
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}
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glEnd();
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glEndList();
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fclose(f);
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return(area);
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}
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/* $Log$
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/* Revision 1.1 1997/10/28 21:14:54 curt
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/* Initial revision.
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/*
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*/
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49
Scenery/obj.h
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49
Scenery/obj.h
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@ -0,0 +1,49 @@
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/**************************************************************************
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* obj.h -- routines to handle WaveFront .obj format files.
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*
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* Written by Curtis Olson, started October 1997.
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*
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* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.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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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#ifndef OBJ_H
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#define OBJ_H
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#ifdef WIN32
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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/* Load a .obj file and generate the GL call list */
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GLint fgObjLoad(char *file);
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#endif /* OBJ_H */
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/* $Log$
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/* Revision 1.1 1997/10/28 21:14:55 curt
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/* Initial revision.
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/*
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*/
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