Initial revision.

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 <windows.h>
+#endif
+
+#include <stdio.h>
+#include <GL/glut.h>
+
+#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.
+/*
+ */

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 <windows.h>
+#endif
+
+#include <GL/glut.h>
+
+
+/* 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.
+/*
+ */