Cube collision
BlitzMax Forums/MiniB3D Module/Cube collision
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| Life would be so much easier if MiniB3D had cube collision instead of only ellipsoid collision! Is there anyone out there with some code that could help me? :/ |
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| So I take it that EntityBox command does not work in miniB3D? The code seems to be all there for triangle intersection testing. http://blitzmax.com/b3ddocs/command.php?name=EntityBox&ref=3d_cat |
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| All the collision methods are ellipsoid though. http://www.blitzbasic.com/b3ddocs/command.php?name=Collisions I need box-to-polygon collision. |
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| Maybe you could look into using a physics library? Most have cube-based collisions. The minib3d extended version has a physics library included. |
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| But the Extended version is old and unfinished/canceled and last time I tried it, it had pretty bad performance and the physics part was in poor condition. :/ |
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| under the miniB3D there is a file: misc.cpp and in this file, there is code for segment-to-triangle intersection testing. So my thought would be to: - perform the ellipsoid intersection - then break that down by getting the triangle closest to the collision by way of CollisionTriangle() - get other entity's triangle by way of EntityCollided() and CollisionTriangle() - then you have your triangle, and you can test the other triangle's 3 segments using C_IntersectSegmentTriangle() This approach I think would work for most meshes, not just boxes. PS: You would also have to add the function to the extern in minib3d.bmx: Function C_IntersectSegmentTriangle:Int( px:float , py:float, pz:float, qx:float, qy:float, qz:float, ax:float, ay:float, az:float, .. bx:float, by:float, bz:float, cx:float, cy:float, cz:float, u:float ptr, v:float ptr, w:float ptr, t:float ptr) Last edited 2011 Last edited 2011 Last edited 2011 |
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| But the Extended version is old and unfinished/canceled and last time I tried it, it had pretty bad performance and the physics part was in poor condition. :/ Oh? How is the physics engine in bad shape? I isolated it from minib3d for usage in my own engine, and so far I found no problems while testing it. So my thought would be to: I believe that in minib3d, it is possible to set the Collisions command to 'no response', as opposed to blitz3d.- perform the ellipsoid intersection Last edited 2011 |
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