Surface Extrapolated

Problem

The following message is displayed:

"Surface Extrapolated"

Cause

The technique used to calculate the image position requires to launch some rays around the image. When the constraints are tensed in the HUD Optical Design (HOD), the image projection may be very close to the mirror sides. That means some vignetting may happen: some of the additional rays launched for HUD Optical Analysis (HOA) calculation may miss the border of the mirror.

Solution

  1. Modify the mirror size and/or the pupil diameter.
  2. Analyze the system with HOA.
  3. Iterate until you get a correct system.