you could check the following: )u~LzE]{_
6+HpN"?e
- if the surface/element tilt is too large PK^{WF}L;
Ftu~ nh}
- enough analysis rays used? KZ^W@*`D
WF#eqU*&
- have you used Coherent Data option under Detector setting. 8;>vgD
{X$8yy2zC5
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.
