Triangle Strips of Tetraheron

Question

I am confused about the triangle strip representation of closed mesh .The vertex buffer for triangle strip representation of the a figure is shown below:

A(0,1) B(0,0) C(1,1) D(1,0)E(2,1)

vertex buffer=[A,B,C,D,E] where, T1=(A,B,C) T2=(B,C,D) T3=(C,D,E)

Now, if I have a tetrahedron with four vertex A(0,0,0),B(1,0,0),C(0,1,0) and D(0,0,1) then what would be its vertex buffer representation?

Thank you very much.

Answer 1

short answer:[A,B,C,D,A,B]

you'll need 4 triangles to create a Tetrahedron. so you'll need 6 vertices in your buffer. not that for the first three vertices you'll only get one triangle but for every other vertex you'll have one extra triangle. now back to your problem, as I said you'll need 4 triangles represented as [A,B,C], [A,B,D], [A,C,D] and [B,C,D] with a little bit sorting you can easily arrange them into a form that each two consecutive triangle share two vertices [A,B,C], [B,C,D], [C,D,A] and finally [D,A,B]. then by combining all those together you'll have your full vertices arrangement which is exactly as I mentioned above.