How to simulate objects floating on water without a physics engine?

Posted by user1075940 on Game Development See other posts from Game Development or by user1075940
Published on 2012-12-15T18:18:49Z Indexed on 2012/12/15 23:21 UTC
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In my game the water movement is done in a shader using Gerstner equations. The water movement looks realistic enough for a school project but I encounter serious problem when I wanted to do sailing on waves (similar to this). I managed to do collision with land by calculating quad's vertices and normals beneath ship, however same method can not be applied to water because XZ are displaced and Y is calculated in a shader :(

  1. How to approach this problem ?

  2. Is it possible to retrieve transformed grid from shader?

  3. Unfortunately no external physics libraries can be used.

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