The function "Compute area" makes me confused

[Zwlzzm]

Hi,

I am using klayout 0.26.9. The SiEPIC version is 0.3.72 Py2.
It create a wire waveguide using path and "path to wireguide" function.
It is 4*10um. However, the function "Compute area" shows the area is 120.35um2.

And for the same structure, open klayout again, the calculated area value is not the same

This is also the case for component Ebeam waveguide_sbend. It shows the area of a waveguide_bend with a radius of 10um and a width of 0.5um is also 71.424 um2.

[lukasc-ubc]

First, this function calculates the area covered by the Waveguide layer over the entire layout. It does not consider the selected object. Could you attach a layout that isn’t being calculated correctly? thanks

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[Zwlzzm]

Dear Professor Lukas,

Thank you for your respond. I think I misunderstood the meaning of this function.

For Ebeam waveguide_sbend with radius of 10um, width of 0.5um. The area calculated is 7.8561um2.
But using the area formula for ring structure (pi*(10.2510.25-9.759.75)/4), this value is 7.85398um2..
There is a slight difference. Is this because that Ebeam waveguide_sbend has a certain number of points (It is not a complete ring)?

test.zip

Beside, about how to launch lumerical from klayout siepic on Centos, Lumerical support has not have a good resolution, and they suggest me ask you for help. Could you give me some suggestions?
SiEPIC/SiEPIC_EBeam_PDK#234

Best regards!

[lukasc-ubc]

I believe a new nm rounding error can be expected. The purpose of this function is to estimate the ebeam writing time.

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[Zwlzzm]

Thank you for your respond and explanation. I got it.