Okay, I'm honestly not sure which forum I should post this in. OpenGL, Math or Game Programming. But, I've got a problem with this code I believe, I just can't find where. (Could be my reasoning though). What I'm trying to do is draw a floor, and have the camera move. I want the floor to stay in the same place (obviously) so I can see that the camera is in fact moving. I realize this should be an easy task, but I'm new to the whole camera thing, and my matrix math isn't up to par.
The problem is, the camera's matrix indicates that the camera is actually moving (the z value is decreasing), but nothing on screen seems to happen. It's leading me to believe that the floor is still being rendered in camera space. Here's the code I'm using:
bool CApp::Loop()
{
float time;
Matrix4f grndmat;
grndmat.SetIdentity();
timer.Update();
time = timer.GetTime();
fpstimer.Update();
fps++;
camera->Update(time);
// Render the 3d stuff.
glEnable(GL_LIGHTING);
glPushMatrix();
camera->Apply();
glPushMatrix();
glMultMatrixf(grndmat.matrix);
float startx = -50.0f;
float startz = -100.0f;
float endx = 50.0f;
float endz = 100.0f;
glEnable(GL_LINE_SMOOTH);
glLineWidth(2.0f);
glBegin(GL_LINE_STRIP);
glColor3f(0.0f, 0.5f, 1.0f);
glNormal3f(0.0f, 1.0f, 0.0f);
for (float z = startz; z < endz; z++) {
glVertex3f(startx, 0.0f, z);
for (float x = startx; x <= endx; x++) {
glVertex3f(x, 0.0f, z);
glVertex3f(x, 0.0f, z + 1.0f);
}
glVertex3f(endx, 0.0f, z + 1.0f);
}
glEnd();
glPopMatrix();
glPopMatrix();
// Swap the buffers
gl->Swap();
// Reset the timer
timer.Reset();
if (fpstimer.GetTime() >= 1) {
fpstimer.Reset();
fts = fps;
fps = 0;
}
// Return
return bStillGoing;
}
In case anyone needs, here is the CCamera::Apply() code:
void CCamera::Apply()
{
Matrix4f tmpMat = matrix;
tmpMat.Transpose();
tmpMat.SetTranslation(0, 0, 0);
glLoadMatrixf(tmpMat.matrix);
glTranslatef(-fPosition.x, -fPosition.y, -fPosition.z);
}
While running, the floor (grndmatrix) is at identity the whole time, and the camera matrix is:
[-1.0f, 0.0f, 0.0f, 0.0f]
[ 0.0f, 1.0f, 0.0f, 0.0f]
[ 0.0f, 0.0f, -1.0f, z ]
[ 0.0f, 0.0f, 0.0f, 1.0f]
I've only put 'z' there because that value is constantly decreasing (which tells me that the camera SHOULD be moving).
I've discussed this with a good friend of mine, who's been pretty much mentoring me, and he's baffled. Any help would be greatly appreciated.
and, please excuse the messy code. I hope i've not confused anyone with my banter.
