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79 jab 1 
// bdl, jab, feb 2005
2 
// Inspired and partly lifted from Nate Robins' Obj loader
3 
 
4 
#include "TriMesh.h"
5 
#include <CGLA/Vec3f.h>
6 
#include <stdio.h>
7 
#include <iostream>
8 
 
9 
using namespace std;
10 
using namespace CGLA;
11 
 
12 
namespace Geometry {
13 
 
14 
	namespace
15 
	{
16 
		string get_path(const string& _filename)
17 
		{
18 
			// Make sure we only have slashes and not backslashes
19 
			string filename = _filename;
20 
			replace(filename.begin(),filename.end(),'\\','/');
21 
 
22 
			// Find the last occurrence of slash.
23 
			// Everything before is path.
24 
			unsigned int n = filename.rfind("/");
25 
			if(n > filename.size())
26 
				return "./";
27 
			string pathname = "";
28 
			pathname.assign(filename,0,n);
29 
			pathname.append("/");
30 
			return pathname;
31 
		}
32 
	}
33 
	class TriMeshObjLoader
34 
	{
35 
		TriMesh *mesh;
36 
		std::string pathname;
37 
 
38 
		int get_vert(int i) {
39 
			assert(i!=0);
40 
			if (i<0) {
41 
				return mesh->geometry.no_vertices()+i;
42 
			} else
43 
				return i-1;
44 
		}
45 
 
46 
		int get_normal(int i) {
47 
			if (i<0) {
48 
				return mesh->normals.no_vertices()+i;
49 
			} else
50 
				return i-1;
51 
		}
52 
 
53 
		int get_texcoord(int i) {
54 
			if (i<0) {
55 
				return mesh->texcoords.no_vertices()+i;
56 
			} else
57 
				return i-1;
58 
		}
59 
 
60 
		void read_material_library(const string& filename);
61 
 
62 
	public:
63 
 
64 
		TriMeshObjLoader(TriMesh *_mesh): mesh(_mesh) {}
65 
 
66 
		void load(const std::string& filename);
67 
	};
68 
 
69 
	void TriMeshObjLoader::read_material_library(const string& filename)
70 
	{
71 
		string fn = pathname + filename;
72 
		FILE* file = fopen(fn.data(), "r");
73 
		if (!file)
74 
			{
75 
				cerr << "Could not open " << filename << endl;
76 
				return;
77 
			}
78 
 
79 
		char  buf[128];
80 
		unsigned int nummaterials=1;
81 
 
82 
		// count the number of materials in the file
83 
		while(fscanf(file, "%s", buf) != EOF)
84 
			{
85 
				switch(buf[0])
86 
					{
87 
					case '#':				/* comment */
88 
						/* eat up rest of line */
89 
						fgets(buf, sizeof(buf), file);
90 
						break;
91 
					case 'n':				/* newmtl */
92 
						fgets(buf, sizeof(buf), file);
93 
						nummaterials++;
94 
						sscanf(buf, "%s %s", buf, buf);
95 
						break;
96 
					default:
97 
						/* eat up rest of line */
98 
						fgets(buf, sizeof(buf), file);
99 
						break;
100 
					}
101 
			}
102 
		rewind(file);
103 
 
104 
		/* allocate memory for the materials */
105 
		mesh->materials.resize(nummaterials);
106 
 
107 
		/* now, read in the data */
108 
		nummaterials = 0;
109 
		while(fscanf(file, "%s", buf) != EOF) {
110 
			switch(buf[0]) {
111 
			case '#':				/* comment */
112 
				/* eat up rest of line */
113 
				fgets(buf, sizeof(buf), file);
114 
				break;
115 
			case 'n':				/* newmtl */
116 
				fgets(buf, sizeof(buf), file);
117 
				sscanf(buf, "%s %s", buf, buf);
118 
				nummaterials++;
119 
				mesh->materials[nummaterials].name = buf;
120 
				break;
121 
			case 'N':
122 
				fscanf(file, "%f", &mesh->materials[nummaterials].shininess);
123 
				/* wavefront shininess is from [0, 1000], so scale for OpenGL */
124 
				mesh->materials[nummaterials].shininess /= 1000.0;
125 
				mesh->materials[nummaterials].shininess *= 128.0;
126 
				break;
127 
			case 'K':
128 
				switch(buf[1])
129 
					{
130 
					case 'd':
131 
						fscanf(file, "%f %f %f",
132 
									 &mesh->materials[nummaterials].diffuse[0],
133 
									 &mesh->materials[nummaterials].diffuse[1],
134 
									 &mesh->materials[nummaterials].diffuse[2]);
135 
						break;
136 
					case 's':
137 
						fscanf(file, "%f %f %f",
138 
									 &mesh->materials[nummaterials].specular[0],
139 
									 &mesh->materials[nummaterials].specular[1],
140 
									 &mesh->materials[nummaterials].specular[2]);
141 
						break;
142 
					case 'a':
143 
						fscanf(file, "%f %f %f",
144 
									 &mesh->materials[nummaterials].ambient[0],
145 
									 &mesh->materials[nummaterials].ambient[1],
146 
									 &mesh->materials[nummaterials].ambient[2]);
147 
						break;
148 
					default:
149 
						/* eat up rest of line */
150 
						fgets(buf, sizeof(buf), file);
151 
						break;
152 
					}
153 
				break;
154 
			case 'm': // Map ... all maps are treated equally.
155 
				{
156 
					fscanf(file,"%s",buf);
178 bj 157 
					mesh->materials[nummaterials].tex_path = pathname;
158 
					mesh->materials[nummaterials].tex_name = string(buf);
79 jab 159 
				}
160 
				break;
161 
			default:
162 
				/* eat up rest of line */
163 
				fgets(buf, sizeof(buf), file);
164 
				break;
165 
			}
166 
		}
167 
	}
168 
 
169 
 
170 
	void TriMeshObjLoader::load(const std::string& filename)
171 
	{
172 
		pathname = get_path(filename);
173 
		FILE *fp = fopen(filename.data(), "r");
174 
		if (fp==0) {
175 
			cerr << "File " << filename << " does not exist" << endl;
364 jrf 176 
      exit(0);
79 jab 177 
		}
178 
		mesh->materials.resize(1);
179 
 
180 
		char buf[256];
181 
		Vec3f v_geo;
182 
		Vec3f v_normals;
183 
		Vec3f v_texcoords;
184 
 
185 
		Vec3i f_geo;
186 
		Vec3i f_normals;
187 
		Vec3i f_texcoords;
188 
		int current_material=0;
189 
		int v,n,t;
190 
		while(fscanf(fp, "%s", buf) != EOF)
191 
			{
192 
				switch(buf[0])
193 
					{
194 
					case '#': // A comment
195 
						fgets(buf, sizeof(buf), fp);
196 
						break;
197 
					case 'm':
198 
						fgets(buf, sizeof(buf), fp);
199 
						sscanf(buf, "%s %s", buf, buf);
200 
						read_material_library(buf);
201 
						break;
202 
					case 'u':
203 
						fgets(buf, sizeof(buf), fp);
204 
						sscanf(buf, "%s %s", buf, buf);
205 
						current_material = mesh->find_material(buf);
206 
						break;
207 
					case 'v': // v, vn, vt
208 
						switch(buf[1])
209 
							{
210 
							case '\0': // vertex
211 
								fscanf(fp, "%f %f %f", &v_geo[0], &v_geo[1], &v_geo[2]);
212 
								mesh->geometry.add_vertex(v_geo);
213 
								break;
214 
							case 'n': // normal
215 
								fscanf(fp, "%f %f %f", &v_normals[0], &v_normals[1], &v_normals[2]);
216 
								mesh->normals.add_vertex(v_normals);
217 
								break;
218 
							case 't': // texcoord
219 
								fscanf(fp, "%f %f", &v_texcoords[0], &v_texcoords[1]);
220 
								v_texcoords[2]=1;
221 
								mesh->texcoords.add_vertex(v_texcoords);
222 
								break;
223 
							}
224 
						break;
225 
					case 'f':
226 
						v = n = t = 0;
227 
						fscanf(fp, "%s", buf);
228 
						// can be one of %d, %d//%d, %d/%d, %d/%d/%d
229 
						if(sscanf(buf, "%d/%d/%d", &v, &t, &n) == 3)
230 
							{ // v/t/n
231 
 
232 
								f_geo[0]=get_vert(v);
233 
								f_texcoords[0]=get_texcoord(t);
234 
								f_normals[0]=get_normal(n);
235 
 
236 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
237 
								f_geo[1]=get_vert(v);
238 
								f_texcoords[1]=get_texcoord(t);
239 
								f_normals[1]=get_normal(n);
240 
 
241 
								fscanf(fp, "%d/%d/%d", &v, &t, &n);
242 
								f_geo[2]=get_vert(v);
243 
								f_texcoords[2]=get_texcoord(t);
244 
								f_normals[2]=get_normal(n);
245 
 
246 
								int idx = mesh->geometry.add_face(f_geo);
247 
								mesh->normals.add_face(f_normals, idx);
248 
								mesh->texcoords.add_face(f_texcoords, idx);
249 
								mesh->mat_idx.push_back(current_material);
250 
 
251 
								// Load a general polygon and convert to triangles
252 
								while(fscanf(fp, "%d/%d/%d", &v, &t, &n)==3)
253 
									{
254 
										f_geo[1]=f_geo[2];
255 
										f_normals[1]=f_normals[2];
256 
										f_texcoords[1]=f_texcoords[2];
257 
 
258 
										f_geo[2]=get_vert(v);
259 
										f_normals[2]=get_normal(n);
260 
										f_texcoords[2]=get_texcoord(t);
261 
 
262 
										int idx = mesh->geometry.add_face(f_geo);
263 
										mesh->normals.add_face(f_normals, idx);
264 
										mesh->texcoords.add_face(f_texcoords, idx);
265 
										mesh->mat_idx.push_back(current_material);
266 
									}
267 
							}
268 
						else if (sscanf(buf, "%d//%d", &v, &n)==2)
269 
							{// v//n
270 
								f_geo[0]=get_vert(v);
271 
								f_normals[0]=get_normal(n);
272 
 
273 
								fscanf(fp, "%d//%d", &v, &n);
274 
								f_geo[1]=get_vert(v);
275 
								f_normals[1]=get_normal(n);
276 
 
277 
								fscanf(fp, "%d//%d", &v, &n);
278 
								f_geo[2]=get_vert(v);
279 
								f_normals[2]=get_normal(n);
280 
 
281 
								int idx = mesh->geometry.add_face(f_geo);
282 
								mesh->normals.add_face(f_normals, idx);
283 
								mesh->mat_idx.push_back(current_material);
284 
 
285 
								// Load a general polygon and convert to triangles
286 
								while(fscanf(fp, "%d//%d", &v, &n)==2)
287 
									{
288 
										f_geo[1]=f_geo[2];
289 
										f_normals[1]=f_normals[2];
290 
										f_geo[2]=get_vert(v);
291 
										int idx = mesh->geometry.add_face(f_geo);
292 
										mesh->normals.add_face(f_normals, idx);
293 
										mesh->mat_idx.push_back(current_material);
294 
									}
295 
							}
296 
						else if (sscanf(buf, "%d/%d", &v, &t) == 2)
297 
							{ // v/t
298 
								f_geo[0]=get_vert(v);
299 
								f_texcoords[0]=get_texcoord(t);
300 
 
301 
								fscanf(fp, "%d/%d", &v, &t);
302 
								f_geo[1]=get_vert(v);
303 
								f_texcoords[1]=get_texcoord(t);
304 
 
305 
								fscanf(fp, "%d/%d", &v, &t);
306 
								f_geo[2]=get_vert(v);
307 
								f_texcoords[2]=get_texcoord(t);
308 
 
309 
								int idx = mesh->geometry.add_face(f_geo);
310 
								mesh->texcoords.add_face(f_texcoords, idx);
311 
								mesh->mat_idx.push_back(current_material);
312 
 
313 
								// Load a general polygon and convert to triangles
314 
								while(fscanf(fp, "%d/%d", &v, &t)==2)
315 
									{
316 
										f_geo[1]=f_geo[2];
317 
										f_texcoords[1]=f_texcoords[2];
318 
 
319 
										f_geo[2]=get_vert(v);
320 
										f_texcoords[2]=get_texcoord(t);
321 
 
322 
										int idx = mesh->geometry.add_face(f_geo);
323 
										mesh->texcoords.add_face(f_texcoords, idx);
324 
										mesh->mat_idx.push_back(current_material);
325 
									}
326 
							}
327 
						else if (sscanf(buf, "%d", &v)==1)
328 
							{ // v
329 
								f_geo[0]=get_vert(v);
330 
 
331 
								fscanf(fp, "%d", &v);
332 
								f_geo[1]=get_vert(v);
333 
 
334 
								fscanf(fp, "%d", &v);
335 
								f_geo[2]=get_vert(v);
336 
 
337 
								mesh->geometry.add_face(f_geo);
338 
								mesh->mat_idx.push_back(current_material);
339 
 
340 
								// Load a general polygon and convert to triangles
341 
								while(fscanf(fp, "%d", &v)==1)
342 
									{
343 
										f_geo[1]=f_geo[2];
344 
										f_geo[2]=get_vert(v);
345 
										mesh->geometry.add_face(f_geo);
346 
										mesh->mat_idx.push_back(current_material);
347 
									}
348 
							}
349 
						break;
350 
					default:
351 
						fgets(buf, sizeof(buf), fp);
352 
						break;
353 
					}
354 
			}
355 
	}
356 
 
357 
 
358 
	void obj_load(const string& filename, TriMesh &mesh)
359 
	{
360 
		TriMeshObjLoader loader(&mesh);
361 
		loader.load(filename);
362 
	}
363 
 
364 
}