reversing normals

[moose o death]

1.
um yeah i'm using xsi to make game art and occasionally i need to make interior's, it would be handy if i knew how to reverse the polygons on existing convex primitives to form concave primitives. i've made do so far by using torus's and cylinders and deleting the outer faces. but the piece of geometry i need to make now is a large spherical room.

2.
while i'm here, where is the option to set the global smoothing angle. i found it once and promptly forgot what i did to get there

[Zafar Iqbal]

1. Select all/wanted polygons and alt click into the menu. Chose Invert Polygons. It's the same as Model->Modify->Poly. Mesh->Invert Polygons.

2. Model->Get->Property->Geometry Approximation->Polymesh->Discontinuity should be what you are looking for.

[moose o death]

thanks for your help, i'll give it a go