3D beginner Problem

Screenshot (11)
I don’t understand what I have done wrong here. It will be very helpful if someone clarifies why this cube is showing in red color.

Hi Ravi,

You have done nothing wrong. I will fix that asap. Thank you for the report.

Is the problem related to what version of FreeFEM I am using?

No, it’s ok, the bug is now fixed in ffcs 24.5

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Sir, can you also tell me what is the alternative of lenEdge for 3D case?