Hi there!
I am currently using lib3ds draw models in my opengl program.
After drawing vertex reading from the 3ds file, it appears a vehicle model on screen, but while I assign the light onto the surface I found there is some fragment displayed incorrectly.
Some far pixel appeared on the nearer surface (matter fact I enabled the depth buffer facility) that I can`t figure what`s wrong with the code.
Attached is my code:
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include <gl/glut.h>
#include <lib3ds.h>
#include <iostream>
typedef float Lib3dsVector[3];
typedef float Lib3dsTexel[2];
using namespace std;
Lib3dsFile* model;
Lib3dsMesh** mesh;
Lib3dsCamera** camera;
Lib3dsFace* face;
Lib3dsLight** light;
Lib3dsMaterial** material;
GLuint vertexVBO,normalVBO,textureVBO;
unsigned long total_face;
void lightup()
{
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
float gambient[]={0.2,0.2,0.2,1.0};
float lightpos[]={1.0,1.0,1.0,0.0};
float lambient[]={1.0,1.0,1.0,1.0};
float ldiffuse[]={0.8,0.8,0.8,1.0};
float lspecular[]={0.3,0.3,0.3,1.0};
glLightfv(GL_LIGHT0,GL_DIFFUSE,ldiffuse);
glLightfv(GL_LIGHT0,GL_AMBIENT,lambient);
glLightfv(GL_LIGHT0,GL_SPECULAR,lspecular);
glLightfv(GL_LIGHT0,GL_POSITION,lightpos);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT,gambient);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
}
void getfaces()
{
total_face=0;
for(long meshcount=0;meshcount<model->nmeshes;meshcount++)
total_face+=mesh[meshcount]->nfaces;
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClearDepth(1.0);
glDepthFunc(GL_LEQUAL);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BITS);
glLoadIdentity();
gluLookAt(camera[0]->position[0]+1000,camera[0]->position[1],camera[0]->position[2],camera[0]->target[0],camera[0]->target[1],camera[0]->target[2],0.0,0.0,1.0);
glColor3f(1.0,0.0,0.0);
glPushMatrix();
lightup();
glScalef(0.5,0.5,0.5);
glTranslatef(0.0,0.0,-1000.0);
long meshcount;
for(meshcount=0;meshcount<model->nmeshes;meshcount++)
{
face=mesh[meshcount]->faces;
for(long i=0;i<mesh[meshcount]->nfaces;i++)
{
glMaterialfv(GL_FRONT,GL_DIFFUSE,material[face[i].material]->diffuse);
glMaterialfv(GL_FRONT,GL_AMBIENT,material[face[i].material]->ambient);
glMaterialfv(GL_FRONT,GL_SPECULAR,material[face[i].material]->specular);
glBegin(GL_TRIANGLES);
glVertex3fv(mesh[meshcount]->vertices[face[i].index[0]]);
glVertex3fv(mesh[meshcount]->vertices[face[i].index[1]]);
glVertex3fv(mesh[meshcount]->vertices[face[i].index[2]]);
glEnd();
}
}
glPopMatrix();
glutSwapBuffers();
}
void keypress(unsigned char key,int x,int y)
{
switch(key)
{
case 27:
exit(0);
break;
}
}
void reshape(int w,int h)
{
if(h==0) h=1;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,w/h,0.0,1000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc,char* argv[])
{
glutInit(&argc,argv);
model=lib3ds_file_open("vehicle.3DS");
if(model==NULL) cout<<"Error"<<endl; else cout<<model->nmaterials<<endl;
mesh=model->meshes;
material=model->materials;
camera=model->cameras;
light=model->lights;
cout<<"Light Num:"<<model->nlights<<endl;
glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowSize(800,800);
glutInitWindowPosition(100,100);
glutCreateWindow("VC 2008 Glut");
glShadeModel(GL_FLAT);
glutKeyboardFunc(keypress);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
return 0;
}
Thank you for reading, any answer would be appreciated.