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PO3ds object is not visible (beginner)
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As a part of my project i need to draw some 3d models. dont have time to learn about 3ds files and how to load them, which looks to me pretty complicated, so i found functions on the web, but the object wont render (or maybe render but not seen). here is the relevant source code : <pre><code> void initGL(int *argc, char **argv) { glutInit(argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); glutInitWindowSize(width, height); glutCreateWindow("CUDA Particle System"); GLenum err = glewInit(); if (GLEW_OK != err) { printf ("Error: openGL is not supported"); exit (0); } glEnable(GL_DEPTH_TEST); glEnable (GL_CULL_FACE); glCullFace(GL_FRONT); glClearColor( 0.7, 0.7 , 0.9 , 0 ); glutReportErrors(); glFrustum(-1,1,-1,1,0.3,100); Chesspawn.load( &chesspawn ,"chesspawn.3DS"); /*glClear (GL_COLOR_BUFFER_BIT); glColor3f ( 0.7, 0.7 , 0.9 ); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-1,1,-1,1,-1,1); gluLookAt(0,0,0,0,0,-100,0,1,0); glViewport (250, 250, width, height);*/ } void display() { sdkStartTimer(&timer.timer); p_system->update(time_Step); //set Positions vbo renderer->setVertexBuffer(p_system->getPosVbo(),p_system->getNumParticles()); //render glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); // view transform glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glGetFloatv(GL_MODELVIEW_MATRIX, modelView); gluLookAt (Params_Camera[CAMERA_X], Params_Camera[CAMERA_Y], Params_Camera[CAMERA_Z], // camera Params_Camera[CAMERA_X] + Params_Camera[DIR_X], Params_Camera[CAMERA_Y] , Params_Camera[CAMERA_Z] + Params_Camera[DIR_Z], // center 0, 1, 0 // up ); renderer->display(); drawFloor(); glScaled (0.001,0.001,1); Chesspawn.render(&chesspawn); //glutSolidSphere (0.5,50,50); /*glTranslated (0,0,-10); glutSolidSphere(0.1,20,20);*/ sdkStopTimer(&timer.timer); glutSwapBuffers(); glutReportErrors(); char sFps[256]; fps = timer.computeFps(); sprintf(sFps, " %s: %d particles %3.1f fps",proc, numParticles, fps); if (fps <24.0) printf ("Slow fps : %f \n", fps); glutSetWindowTitle(sFps); } </code></pre> and this is the load and render functions: <pre><code>static char C_3dsObject::load (obj_type_ptr p_object, char *p_filename) { int i; //Index variable int File_Length = 0; FILE *l_file; //File pointer unsigned short l_chunk_id; //Chunk identifier unsigned int l_chunk_lenght; //Chunk lenght unsigned char l_char; //Char variable unsigned short l_qty; //Number of elements in each chunk unsigned short l_face_flags; //Flag that stores some face information if ((l_file=fopen (p_filename, "rb"))== NULL) return 0; //Open the file fseek (l_file, 0, SEEK_END); // get file length File_Length = ftell (l_file); fseek(l_file, 0L, SEEK_SET); while (ftell (l_file) < File_Length ) //Loop to scan the whole file { //getche(); //Insert this command for debug (to wait for keypress for each chuck reading) fread (&l_chunk_id, 2, 1, l_file); //Read the chunk header //printf("ChunkID: %x\n",l_chunk_id); fread (&l_chunk_lenght, 4, 1, l_file); //Read the lenght of the chunk //printf("ChunkLenght: %x\n",l_chunk_lenght); switch (l_chunk_id) { //----------------- MAIN3DS ----------------- // Description: Main chunk, contains all the other chunks // Chunk ID: 4d4d // Chunk Lenght: 0 + sub chunks //------------------------------------------- case 0x4d4d: break; //----------------- EDIT3DS ----------------- // Description: 3D Editor chunk, objects layout info // Chunk ID: 3d3d (hex) // Chunk Lenght: 0 + sub chunks //------------------------------------------- case 0x3d3d: break; //--------------- EDIT_OBJECT --------------- // Description: Object block, info for each object // Chunk ID: 4000 (hex) // Chunk Lenght: len(object name) + sub chunks //------------------------------------------- case 0x4000: i=0; do { fread (&l_char, 1, 1, l_file); p_object->name[i]=l_char; i++; }while(l_char != '\0' && i<20); break; //--------------- OBJ_TRIMESH --------------- // Description: Triangular mesh, contains chunks for 3d mesh info // Chunk ID: 4100 (hex) // Chunk Lenght: 0 + sub chunks //------------------------------------------- case 0x4100: break; //--------------- TRI_VERTEXL --------------- // Description: Vertices list // Chunk ID: 4110 (hex) // Chunk Lenght: 1 x unsigned short (number of vertices) // + 3 x float (vertex coordinates) x (number of vertices) // + sub chunks //------------------------------------------- case 0x4110: fread (&l_qty, sizeof (unsigned short), 1, l_file); p_object->vertices_qty = l_qty; //printf("Number of vertices: %d\n",l_qty); for (i=0; i<l_qty; i++) { fread (&p_object->vertex[i].x, sizeof(float), 1, l_file); //printf("Vertices list x: %f\n",p_object->vertex[i].x); fread (&p_object->vertex[i].y, sizeof(float), 1, l_file); //printf("Vertices list y: %f\n",p_object->vertex[i].y); fread (&p_object->vertex[i].z, sizeof(float), 1, l_file); //printf("Vertices list z: %f\n",p_object->vertex[i].z); //Insert into the database } break; //--------------- TRI_FACEL1 ---------------- // Description: Polygons (faces) list // Chunk ID: 4120 (hex) // Chunk Lenght: 1 x unsigned short (number of polygons) // + 3 x unsigned short (polygon points) x (number of polygons) // + sub chunks //------------------------------------------- case 0x4120: fread (&l_qty, sizeof (unsigned short), 1, l_file); p_object->polygons_qty = l_qty; //printf("Number of polygons: %d\n",l_qty); for (i=0; i<l_qty; i++) { fread (&p_object->polygon[i].a, sizeof (unsigned short), 1, l_file); //printf("Polygon point a: %d\n",p_object->polygon[i].a); fread (&p_object->polygon[i].b, sizeof (unsigned short), 1, l_file); //printf("Polygon point b: %d\n",p_object->polygon[i].b); fread (&p_object->polygon[i].c, sizeof (unsigned short), 1, l_file); //printf("Polygon point c: %d\n",p_object->polygon[i].c); fread (&l_face_flags, sizeof (unsigned short), 1, l_file); //printf("Face flags: %x\n",l_face_flags); } break; //------------- TRI_MAPPINGCOORS ------------ // Description: Vertices list // Chunk ID: 4140 (hex) // Chunk Lenght: 1 x unsigned short (number of mapping points) // + 2 x float (mapping coordinates) x (number of mapping points) // + sub chunks //------------------------------------------- //----------- Skip unknow chunks ------------ //We need to skip all the chunks that currently we don't use //We use the chunk lenght information to set the file pointer //to the same level next chunk //------------------------------------------- default: fseek(l_file, l_chunk_lenght-6, SEEK_CUR); } } fclose (l_file); // Closes the file stream return (1); // Returns ok } void render (obj_type_ptr object) { int l_index; //glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //glMatrixMode(GL_MODELVIEW); // Modeling transformation glLoadIdentity(); //glTranslatef(0.0,0.0,-500.0); glColor3d(1,1,0); // Rotations of the object (the model matrix is multiplied by the rotation matrices) glRotatef(rotation_x,1.0,0.0,0.0); glRotatef(rotation_y,0.0,1.0,0.0); glRotatef(rotation_z,0.0,0.0,1.0); // TODO: Add your message handler code here //rotation_x = rotation_x + rotation_x_increment; ///// //rotation_y = rotation_y + rotation_y_increment; //rotation_z = rotation_z + rotation_z_increment; if (rotation_x > 359) rotation_x = 0; if (rotation_y > 359) rotation_y = 0; if (rotation_z > 359) rotation_z = 0; // glBegin and glEnd delimit the vertices that define a primitive (in our case triangles) glBegin(GL_TRIANGLES); for (l_index=0;l_index < object->polygons_qty;l_index++) { //----------------- FIRST VERTEX ----------------- // Coordinates of the first vertex glVertex3f( object->vertex[ object->polygon[l_index].a ].x, object->vertex[ object->polygon[l_index].a ].y, object->vertex[ object->polygon[l_index].a ].z); //Vertex definition //----------------- SECOND VERTEX ----------------- // Coordinates of the second vertex //float x= object.vertex[ object.polygon[l_index].b ].x; glVertex3f( object->vertex[ object->polygon[l_index].b ].x, object->vertex[ object->polygon[l_index].b ].y, object->vertex[ object->polygon[l_index].b ].z); //----------------- THIRD VERTEX ----------------- // Coordinates of the Third vertex glVertex3f( object->vertex[ object->polygon[l_index].c ].x, object->vertex[ object->polygon[l_index].c ].y, object->vertex[ object->polygon[l_index].c ].z); } glEnd(); glutSwapBuffers(); } </code></pre> what i tried so far: <ol> <li>debuging & checking if the vertices have a valid values:</li> </ol> for the 3ds file that was attached to the code - seems that yes for other 3ds files i found - no. <ol> <li>trying to scale the object up and down - no result</li> <li>replacing all the code inside render() with glutSolidSphere(0.5,50,50) - the sphere is visible</li> <li>as you see in render() i disabled glClear() and glMatrixMode() thats because i think they not needed, if enabled they make all other object disapear without seeing the 3ds object.</li> </ol> my questions are: <ol> <li>is load() looks correct?</li> <li>are there other vertions of 3ds file which not "feet" for this load()?</li> <li>is there any setting to openGL which i can try to change in order to see the object?</li> <li>do you know other 3d model format which is simpler to load and yet well distribution and easy to find, as 3ds is?</li> </ol>
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<object><opengl><invisible><3ds>
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3ds object is not visible (beginner)
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