July 14, 2023 at 4:35 pm
Guilin Sun
Ansys Employee

From your description the bottom monitor should capture reflection, because it is behind the source. The standard settings should be like this:

Please watch some edu videos to get more information: https://optics.ansys.com/hc/en-us/sections/360007813194-FDTD100-List-of-videos

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