Flatten of a (poly)surface

[genossealex]

Hi.

Is it possible to flatten a (poly)surface or pullontoplane without creating of curves before?

My surfaces are not flat and as you can see, if i merge them and want to create perimetercurves (i need an outline) i get “wrong” lines.

My hope is, that if i can flatten the surfaces so that they have the same elevation, the perimetercurve function will create a correct outline.

It seems to work with the polysurface in the back.

[christian.stan]

Hello, I had to retrieve the contour of the surface before the projection [Even if the input is a geometry], it only accepts the contour it seems (comment with reservations)

cordially
christian.stan