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Actual Shape Collision with ICE Particles.
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  • Total Posts: 34
  • Joined: 18 August 2008 11:08 AM

So, i’m trying to fill a bowl with trillions of coloured jelly beans and i thought the best way to do this would be by using the all new ICE.

The problem is that the bowl has a complex shape and the default Convex Hull won’t work on it. How to use “Actual Shape” like on older collision system ?



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  • mde
  • Posted: 25 September 2008 09:20 PM

[quote=Doomlord;11788]So, i’m trying to fill a bowl with trillions of coloured jelly beans and i thought the best way to do this would be by using the all new ICE.

The problem is that the bowl has a complex shape and the default Convex Hull won’t work on it. How to use “Actual Shape” like on older collision system ?

AFAIK, you can’t at the moment. The workaround would be breaking the object into convex pieces and use them as obstacles.



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And how do i do that with a bowl and still maintaining it’s perfectly round shape ? :)



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Use one bowl with full number of poly, and second (hidden) with reduced polycount for collision. Also use search - this topic was already touched.



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- take your geometry and reduce it until you´r satisfied
- extract the colliding polygons
- break it up into single polygons :
select all edges and do a disconnect components.
do a small loop which is extracting and deleting from components.
- important -> give the individual polygons a thickness:
select all edges and do a extrude component with a negative value
- make a group of all objects and plug it into the obstacle port.

et voilà

be aware of a slowdown if you have a lot of pieces !

cheers

chris



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- important -> give the individual polygons a thickness:
select all edges and do a extrude component with a negative value

In fact not necessary :P



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in fact it should work. if you get a flat poly grid as obstacle it works.
but i had either not working collisions, or multiple crashes until i gave
the faces a certain thickness. buggy somehow ;-)
first i thought it was the triangles on the bottom of the bowl, but also
quads had the same problem.



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