Using a single Render OP/Vertex Buffer for separate strips

[Mind Calamity]

So, adding to my previous question, I got to here: (screenshot) http://prntscr.com/5oc99i

In this case, would I have to use a separate vertexbuffer/render op for each different shape ?

What can I do to break the strips up ?

[Wolfmanfx]

join together triangle strips using degenerate triangles.

[Kojack]

In directx (I know it's in dx10, not sure about dx9) you can restart a triangle strip or fan by giving an index of -1 (0xffff for 16 bit indices or 0xffffffff for 32 bit).
http://msdn.microsoft.com/en-us/library ... 85%29.aspx (at the bottom)

Opengl has it too, but you need to enable it with a couple of commands first (which ogre doesn't do, I searched the source).
https://www.opengl.org/wiki/Vertex_Rend ... ve_Restart

[Mind Calamity]

From Wikipedia a degenerate triangle is a zero-area triangle, so how do I do this ?

I'm keeping all my vertices in a vector buffer and the layout is basically like this:

Current: ABC DEF
Would this fix it: ABC DDD DEF ?

That would technically be a zero-area "triangle", right ?

Edit: Apparently I wrote this and clicked Preview, damn...
@Kojack: I'm not using indices when filling the vertex buffer.

[Kojack]

Just remember that without indices, the gpu's vertex cache is disabled. Every vertex needs to be processed. So doing ABC DDD DEF means D is processed 4 times, whereas with indices it would be once (even ignoring the restart thing). Shouldn't be a problem, depending on the scene, but something to keep in mind if performance becomes an issue. (indexed triangle lists with optimised ordering can outperform triangle strips)

There's some examples of degenerate triangle strips here: http://stackoverflow.com/questions/1871 ... -triangles