problem with extrusion of triangles

[flier]

I have to extrude triangles with which I brushed a surface. being the triangle the only figure of sure belonging to a plan is the only one I can extrude with certainty. But for some triangles made with face3d or with closed polylinea3d tells me that it is not a complanar object.... why is it possible? He only does it with some triangles... Does anyone know how I can solve the problem? being closed triangles the vertices should be by complanar force!!! thanks for the help

 

[lattu]

you should try to explode the triangles on which you have problems, turn them one by one into regions and then extrude them

 

[alesky72]

if the only explanation is that both objects, both face 3d and closed polylinea, have more than 3 vertices; So they don't lie on the same floor.
even if to the eye it seems there are only 3
It can generally be due to the fact that to generate objects you clicked on two very close points between them, perhaps due to wrong snaps.
You could try to recreate them by being careful to use the object snaps properly.