From 1482fc2d3e2e325f9dd5e1bf6539774730ce1325 Mon Sep 17 00:00:00 2001 From: curt Date: Tue, 28 Oct 1997 21:14:54 +0000 Subject: [PATCH] Initial revision. --- Scenery/obj.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++++ Scenery/obj.h | 49 +++++++++++++++++ 2 files changed, 199 insertions(+) create mode 100644 Scenery/obj.c create mode 100644 Scenery/obj.h diff --git a/Scenery/obj.c b/Scenery/obj.c new file mode 100644 index 000000000..ea92cffa2 --- /dev/null +++ b/Scenery/obj.c @@ -0,0 +1,150 @@ +/************************************************************************** + * obj.c -- routines to handle WaveFront .obj format files. + * + * Written by Curtis Olson, started October 1997. + * + * 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * $Id$ + * (Log is kept at end of this file) + **************************************************************************/ + + +#ifdef WIN32 +# include +#endif + +#include +#include + +#include "obj.h" + +#include "../constants.h" +#include "../types.h" +#include "../Math/fg_geodesy.h" +#include "../Math/polar.h" + + +#define MAXNODES 100000 + +float nodes[MAXNODES][3]; + + +/* convert a geodetic point lon(arcsec), lat(arcsec), elev(meter) to + * a cartesian point */ +struct fgCartesianPoint geod_to_cart(float geod[3]) { + struct fgCartesianPoint p; + double gc_lon, gc_lat, sl_radius; + + printf("A geodetic point is (%.2f, %.2f, %.2f)\n", + geod[0], geod[1], geod[2]); + + gc_lon = geod[0]*ARCSEC_TO_RAD; + fgGeodToGeoc(geod[1]*ARCSEC_TO_RAD, geod[2], &sl_radius, &gc_lat); + + printf("A geocentric point is (%.2f, %.2f, %.2f)\n", gc_lon, + gc_lat, sl_radius+geod[2]); + + p = fgPolarToCart(gc_lon, gc_lat, sl_radius+geod[2]); + + printf("A cart point is (%.8f, %.8f, %.8f)\n", p.x, p.y, p.z); + + return(p); +} + + +/* Load a .obj file and generate the GL call list */ +GLint fgObjLoad(char *path) { + char line[256]; + static GLfloat color[4] = { 0.5, 0.5, 0.25, 1.0 }; + struct fgCartesianPoint p1, p2, p3; + GLint area; + FILE *f; + int first, ncount, n1, n2, n3; + + if ( (f = fopen(path, "r")) == NULL ) { + printf("Cannot open file: %s\n", path); + exit(-1); + } + + area = glGenLists(1); + glNewList(area, GL_COMPILE); + + /* glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color ); */ + glColor3fv(color); + + glBegin(GL_TRIANGLE_STRIP); + + first = 1; + ncount = 1; + + while ( fgets(line, 250, f) != NULL ) { + if ( line[0] == '#' ) { + /* comment -- ignore */ + } else if ( line[0] == 'v' ) { + /* node (vertex) */ + if ( ncount < MAXNODES ) { + printf("vertex = %s", line); + sscanf(line, "v %f %f %f\n", + &nodes[ncount][0], &nodes[ncount][1], &nodes[ncount][2]); + ncount++; + } else { + printf("Read too many nodes ... dying :-(\n"); + exit(-1); + } + } else if ( line[0] == 't' ) { + /* start a new triangle strip */ + + if ( !first ) { + /* close out the previous structure and start the next */ + first = 0; + glEnd(); + glBegin(GL_TRIANGLE_STRIP); + } + + printf("new tri strip = %s", line); + sscanf(line, "t %d %d %d\n", &n1, &n2, &n3); + + p1 = geod_to_cart(nodes[n1]); + p2 = geod_to_cart(nodes[n2]); + p3 = geod_to_cart(nodes[n3]); + } else if ( line[0] == 'q' ) { + /* continue a triangle strip */ + n1 = n2 = 0; + + printf("continued tri strip = %s", line); + sscanf(line, "q %d %d\n", &n1, &n2); + printf("read %d %d\n", n1, n2); + } else { + printf("Unknown line in %s = %s\n", path, line); + } + } + + glEnd(); + glEndList(); + + fclose(f); + + return(area); +} + + +/* $Log$ +/* Revision 1.1 1997/10/28 21:14:54 curt +/* Initial revision. +/* + */ diff --git a/Scenery/obj.h b/Scenery/obj.h new file mode 100644 index 000000000..af8f4099d --- /dev/null +++ b/Scenery/obj.h @@ -0,0 +1,49 @@ +/************************************************************************** + * obj.h -- routines to handle WaveFront .obj format files. + * + * Written by Curtis Olson, started October 1997. + * + * 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * $Id$ + * (Log is kept at end of this file) + **************************************************************************/ + + +#ifndef OBJ_H +#define OBJ_H + + +#ifdef WIN32 +# include +#endif + +#include + + +/* Load a .obj file and generate the GL call list */ +GLint fgObjLoad(char *file); + + +#endif /* OBJ_H */ + + +/* $Log$ +/* Revision 1.1 1997/10/28 21:14:55 curt +/* Initial revision. +/* + */ -- 2.39.2