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Dark Physics & Dark A.I. & Dark Dynamix / Bouncing ball question

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Coin
19
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Joined: 15th Mar 2005
Location: Bexley, UK
Posted: 11th Feb 2008 21:30
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I am in the very early stages of a pool-type game and have created a crude temporary "pool table" from five 3D primitives for testing purposes. I have assigned materials to each of the four "cushions" and "table-top" and can successfully make the "ball" bounce between opposite cushions until it slows to a halt. However, if the ball hits a cushion at slow speed it appears to stick to it. I assumed that the PHY SET BOUNCE THRESHOLD instruction would resolve this, but no matter what negative value I give it (even 0), this has no effect on the sticky ball at low speeds. Which instruction am I overlooking?

A secondary problem is that the ball loses speed at different rates. When moving quickly it loses speed rapidly, but, after slowing down, it takes a long time to come to a complete halt. A uniform deceleration would be more realistic; I assume this is just a matter of designing the table-top material correctly.
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monotonic
18
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Joined: 24th Mar 2006
Location: Nottinghamshire, England
Posted: 11th Feb 2008 23:09
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You could try using dbPhySetMaterialRestitution and set the restitution value for the material of the cushions.

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Coin
19
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Joined: 15th Mar 2005
Location: Bexley, UK
Posted: 13th Feb 2008 13:06
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Thanks for the reply, but I have already experimented with the restitution settings. It currently stands at 1.0 for cushions (maximum bounce) and 0.0 (no bounce) for the table top. I've played with other settings - a couple of which I don't even understand (like anistrophy) - and I'm not really sure what to try next.
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Coin
19
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Location: Bexley, UK
Posted: 19th Feb 2008 00:45
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Have I really defeated everyone with this question?
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jason p sage
16
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Joined: 10th Jun 2007
Location: Ellington, CT USA
Posted: 20th Feb 2008 23:35
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Personally - if I can't get something to work the way I want. I Force it.

You could apply your own dampening - in other words - add your own... "Forces" opposite the direction the balls are going - or tweaks reading/modiy/write the velocity and rotation values.


http://www.jasonpetersage.com/?PAGE=ironinfantry&SECTION=ironinfantry
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Coin
19
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Joined: 15th Mar 2005
Location: Bexley, UK
Posted: 21st Feb 2008 12:50
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Thank you for that - it gives me a few more clues. I was hoping that the use of Dark Physics would mean not having to invent tweaks such as these, (plus all my own collision checking) but it is not to be.
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