I am trying to simulate the effect of the camera moving over an infinite textured plane. I am doing this by placing a stationary surface(centred at 0,0) and applying texture transforms to give the appearance of movement. I have set the original texture coordinates such that the texture origin lies at the centre of the surface. I can now happily rotate the texture to look in different directions. The problem is when I move forward. I am calculating what I think ought to be the correct translation in x and y to produce the desired effect but whilst the texture moves it doesnt move in the right direction so as to simulate a camera moving forward. Getting desperate. Here is the relevent code. Any suggestions greatly appreciated.
if (direction == ‘l’) // left
{
theta = theta + 3 ;
}
if (direction ==‘r’) // right
{
theta = theta - 3 ;
}
if (direction == ‘f’) // forward
{
txinc = sin(0.0175theta) ;
tyinc = cos(0.0175theta) ;
txpos = txpos + txinc ;
typos = typos + tyinc ;
}
glMatrixMode(GL_TEXTURE) ;
glLoadIdentity() ;