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some question about 3D MMO Physics?

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hello everyone! I'm doing in a job involing development a 3D MMOG. What the current main technology to do collison detection on the 3D MMOG server side? I tried use elevation data to collison detection. But it's ineffiency and diffcult to get elevation data from 3ds scene. any comments and advices are appeciated.

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I do not believe this is the forum for this question. Probably wanna take it ot the Game programming thread

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Guild wars seems to just pick up the terrain height underneath you and put you there. The collision isn't fantastic, but it does the job.

Similarly, a ray cast from underneath the feets.

As for inneficiency, bilinear interpolation on heightmap (elevation data) is very efficient.

Else, well, anything goes.

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