# Iso curve of trimmed surface

Is there any way to get each iso curve of one surface? for example,the curve u=0.3. it seems that OCC just have the function to get Iso curve
of untrimmed surface, and i have tried to get iso curve of trimmed surface by find intersections of base surface's iso curve and inner loop 2d curves,
but OCC doesn't support it, is there any way to do it?

Best Regards,
Allen.

Have a look at the source code for StdPrs_WFDeflectionRestrictedFace::Add, there is a part that is used to draw iso for 3d trimmed surface, look at the classes Hatch_Hatcher and StdPrs_ToolRFace.

Good Luck,
Francois.