// Rotate camera left or right (aka Pan)
public void Yaw(float angle)
{
// rotate around the up vector (normally the y-axis)
viewdir = (viewdir * (float) Math.Cos (angle)) - (right * (float) Math.Sin (angle));
viewdir.Normalize ();
right = viewdir.Cross (up);
right.Normalize ();
}
// Direct the camera toward a specific point in space using the specified upward orientation
public void LookAt(Vertex point, Vector upVector)
{
viewdir = point - position;
viewdir.Normalize ();
up = upVector.Normal;
right = viewdir.Cross (up);
right.Normalize ();
}
// Rotate camera up or down (aka Tilt)
public void Pitch(float angle)
{
// rotate around the right vector (normally the x-axis)
viewdir = (viewdir * (float) Math.Cos (angle)) + (up * (float) Math.Sin (angle));
viewdir.Normalize ();
up = viewdir.Cross (right);
up.Normalize ();
}
public void LookAt(Vertex point)
{
Vector delta = point - position;
viewdir = delta.Normal;
if (Math.Abs (delta.x) < 0.00001f && Math.Abs (delta.z) < 0.00001f) {
delta.x = 0.0f;
delta.Normalize ();
right = new Vector (1.0f, 0.0f, 0.0f);
up = delta.Cross (right);
right = viewdir.Cross (up) * -1.0f;
} else {
delta.y = 0.0f;
delta.Normalize ();
up = new Vector (0.0f, 1.0f, 0.0f);
right = delta.Cross (up) * -1.0f;
up = viewdir.Cross (right);
}
right.Normalize ();
up.Normalize ();
}
