Fusing two TopoDS_Shape.... help

HI, If I fuse two topoDS_Shape I can not display it correctly with Shape Viewer, because part of the fused object is invisible and I can see it only in wireframe display mode but no shading is vsible. Can you help me t o solve this strange behaviour ?? Cordially a.g.

Olivier grognet's picture

Your problem should come from bad Normal directions. Be sure all the Normals of your faces are oriented out of the solid

g-alessio's picture

OK, if I fuse two cylinder thru the two basis what haeppen?

the outgoing normal of the first faces enter in the second cylinder and vice-versa, that could be a problem again?? Cordially A.g.

P.s.: i know my english is terrible :-D