Inside out sphere collision thingy

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BatVink

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Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 12th Sep 2003 03:03

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I thought if you turned a sphere inside out, you could use collision detection on the inside?

Just tried it, and I get collisions detected whether it's inside out or "normal". I set Collision detection to Sphere.

Anyone fill me in on how I get it right?

StevieVee
http://facepaint.me.uk/catalog/default.php

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Damokles

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Joined: 28th May 2003

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Posted: 14th Sep 2003 11:36

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I would try it mathematically :
Calculate the distance between the object and the center of your sphere, and if it is larger than the radius of the sphere, then you shall put what happens when it collides

"Begin at the beginning, and go on till you come to the end: then stop." - Lewis Carroll

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Posted: 14th Sep 2003 11:43

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well x^2+y^2+z^2=1 is any point on the surface of a sphere IIRC (bit rusty on this

), so where x^2+y^2+z^2<1 then thats inside the sphere, and where its greater than 1 then you are outside the sphere, of course your position for the center of the sphere would have to be 0,0,0, or you could deduct the offset and add it in again after, I think thats right, but it might be wise to wait for someone with better math skills to confirm that (I`ve only been up 10 minutes