void forward( float distance, float yaw, float pitch, int max_yaw, int max_pitch )
if (forward || backward)
{
float sign = (forward ? 1.0f : -1.0f);
Posx += sign * 20.0f * sinf(Yaw);
Posy += sign * 20.0f * sinf(-Pitch);
Posz += sign * 20.0f * cosf(Yaw);
}