HDRKID
Senior Member
Steven Gibbs says to use an HDR you should find a vortex. That is an integral part of the equation. Vortex exist at the intersection of two grid lines and is also called a grid point. Check up on the Hartmann Grid.
http://earthtransitions.com/Earth-Healing/Hartmann-Grid.html
http://earthtransitions.com/Earth-Healing/Hartmann-Grid.html