I want use a toroid like a object in my game but i don’t know how do it. Pls, help.
The is no primitive for that in Unity. You either have to get a 3D model from somewhere and import it into Unity or create it programmatically.
You need to generate the mesh data for the toroid.
Then you simply add this mesh to the scene as any other mesh.
You could need an algorithm to generate the mesh for you.
There’s a unify wiki post with usefull codesamples for procedural primitives.
You could take the code from there.
http://wiki.unity3d.com/index.php/ProceduralPrimitives
Or, more simple, use any 3D modeller tool (for example blender), create the toroid and import it in Unity. (As described by doublemax)
Greetings
Chillersanim