Question

So I decided to make a 3D Stars kinda thing in C++ with SDL and OpenGL. I created a Point class which holds x, y, and z values. I create an array of Points and fill it with random coordinates. This seems to work but when I do glTranslatef(0,0,0.1f) or something similar, the stars don’t come close, they just disappear.

//OpenGL Initialization Code
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(30.0f,640.0/480.0,0.3f,500.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_DEPTH_TEST);

//Random point generation
for(int i = 0; i < 200000; i++)
{
   float randomX = (float)rand()/((float)RAND_MAX/100.0f) - 50.0f;
   float randomY = (float)rand()/((float)RAND_MAX/20) - 10.0f;
   float randomZ = (float)rand()/((float)RAND_MAX/20) - 20.0f;
   points[i] = Point(randomX, randomY,randomZ);
}

//Render
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_POINTS);
for(int i = 0; i < 200000; i++)
{
   glVertex3f(points[i]._x, points[i]._y, points[i]._z);
}
glEnd();
glTranslatef(0,0,0.1f);
SDL_GL_SwapBuffers();
SDL_Flip(screen);

What am I doing wrong?

Answer 1

I moved the OpenGL initialization code after the code where I init SDL SetVideoMode, it works as it should now.