[ODE] Re: Heightfield / Collision.

[Chris Brodie]

>From: gl [mailto:gl@ntlworld.com] 
>
>There's always one, right ; ).

:) Came up with that nastiness all by myself too, does it show? I posted the technique to GD-Algorithms about a year ago and nobody cold tell me of a faster way to draw a stripped tile. 

Your doing a great job BTW, keep at it, I would have been frustrated to boredom by the debate by now :)

I sort of have a picture of what your doing structurally. I assume that on each of my terrain tiles I create a dTerrainID , by passing it an AABB and an ID\pointer whatever to my tile(I supply this), something like :

Lazy psudo code blobs:

void callback(dVector& in, triangle& out, void* mypointer)
{
	((static_cast<CTile*>)mypointer)->Collide(in, out);
}

In my tile creation:

dTerrain m_TileId = dCreateTerrain(aabb, callback, mypointer);

When an object collides with the AABB in ODE the callback then asks my callback func for the triangle over which the point resides. I build that data return it and your code then does the geeky math stuff, returns the ode penetration depth \ normal whatever and we get our nice bounce. More or less, if in ODE the object straddled both AABB's along a boundry you'd need to query both my tiles I guess...

Or have I missed the point. This looks good to me. So long as it's fast, and object are brought to rest. There is going to be a crapload of these in most engines as everything dynamic is supported(held up) by the terrain.

I like this system, assuming I'm guessing how it works correctly!


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