私のプロジェクトの一環として、いくつかの 3d モデルを描画する必要があります。
3ds ファイルとそのロード方法について学ぶ時間がないので、かなり複雑に見えます。そのため、Web で関数を見つけましたが、オブジェクトがレンダリングされません (または、レンダリングしても表示されない可能性があります)。
関連するソースコードは次のとおりです。
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);
}
これは load 関数と render 関数です。
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();
}
私がこれまでに試したこと：
- 頂点に有効な値があるかどうかのデバッグとチェック:
コードに添付された3dsファイルの場合-私が見つけた他の3dsファイルの場合ははいのようです-いいえ。
オブジェクトを拡大または縮小しようとしています - 結果はありません
render() 内のすべてのコードを glutSolidSphere(0.5,50,50) に置き換えます -球体が表示されます
render() でわかるように、glClear() と glMatrixMode() を無効にしました。これは、必要ないと思うためです。有効にすると、3ds オブジェクトが表示されずに他のすべてのオブジェクトが消えます。
私の質問は次のとおりです。
load() は正しいですか?
この load() の「足」ではない 3ds ファイルの他のバージョンはありますか?
オブジェクトを表示するために変更できる openGL の設定はありますか?
3ds のように、読み込みが簡単で、配布が容易で、見つけやすい他の 3d モデル形式を知っていますか?