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OM-Modalys : spectral-diffraction truncated -- Not possible to apply Materials


There are 2 small issues by trying to work with OM-Modalys:
Patch 1. I applied different materials for the rect-plate, but the sound result remains the same.
Patch 2. The spectral-diffraction seems to be truncated, 0.99 has the same result as 0, but the sound result of 1 is very far away from 0.99.

Is there anyway to help me to avoid these difficulties? Thank you very much in advance!

Best wishes,

1.modalys-report-material-non-change.omp (63.3 KB)
2.modalys-report-spectral-diffraction-truncated.omp (94.6 KB)