Alain wrote:
> More simple testing.  I added Alex Kluchikov's wonderful Polar bear
> (p.b.s-f) to go with the ice theme for the fun of it and since it's so
> adorable.

I like that.  The look on the Polar Bear's face as he turns to the 
camera seems to convey a rather resigned: "why are you dropping these 
balls on me?"



> I've added a few things to the simulation code, such as every ball and
> collision object may have different independent coefficients of restitution
> (bounciness) and coefficients of friction (slipperiness).  I was testing
> these here:
> 
>     - The red balls are very bouncy, the blue balls have little bounce.
> Each ball has been assigned a random bounciness and this is reflected in
> their bands of color by various shades of red/blue mix (shades of purple, I
> guess).
>     - The red wall is bouncy, the blue wall is not.
>     - The floor has a variable coefficient of friction, from very little
> friction at the left, like ice, to more normal, like concrete, at the right
> (the balls and the other objects all have the same (fairly high) coefficient
> of friction for this test).


Are you planning on releasing this as an include file or macro sometime? 
  It looks very good.

Dave Matthews

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Dave Matthews <dma### [at] nospamnet> wrote in
news:3f9d5524$1@news.povray.org: 

> [...]
> Are you planning on releasing this as an include file or macro
> sometime? 
>   It looks very good.

Thanks.  Yes, I'm actually working on that now.  I'm cleaning things up and 
putting together some samples on use.  Should be the next thing I post.

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I love this anim :)

On Sat, 25 Oct 2003 09:43:02 -0400, Alain <noe### [at] onca> wrote:

> More simple testing.  I added Alex Kluchikov's wonderful Polar bear
> (p.b.s-f) to go with the ice theme for the fun of it and since it's so
> adorable.
>
> I've added a few things to the simulation code, such as every ball and
> collision object may have different independent coefficients of 
> restitution
> (bounciness) and coefficients of friction (slipperiness).  I was testing
> these here:
>
> - The red balls are very bouncy, the blue balls have little bounce.
> Each ball has been assigned a random bounciness and this is reflected in
> their bands of color by various shades of red/blue mix (shades of purple, 
> I
> guess).
> - The red wall is bouncy, the blue wall is not.
> - The floor has a variable coefficient of friction, from very little
> friction at the left, like ice, to more normal, like concrete, at the 
> right
> (the balls and the other objects all have the same (fairly high) 
> coefficient
> of friction for this test).
>
> (The room's front wall has been set to no_image).
>
>
>
>



-- 
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"Alain" <noe### [at] onca> wrote in message news:3f9a7e1b@news.povray.org...
>     - The red wall is bouncy, the blue wall is not.

I suppose that accounts for what to my eyes seems as though the balls are
bouncing slightly *through* the blue wall before rebounding? Like the wall
is actually a little further away than it seems. Or maybe my brain expects
the balls to bounce harder off the blue wall than they actually are. Hmm.

Nifty animation -- both as a test, and as an inadvertent optical illusion!

Mark

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"Mark Hanson" <mar### [at] comcastnet> wrote in
news:3fb11715$1@news.povray.org: 

> "Alain" <noe### [at] onca> wrote in message
> news:3f9a7e1b@news.povray.org... 
>>     - The red wall is bouncy, the blue wall is not.
> 
> I suppose that accounts for what to my eyes seems as though the balls
> are bouncing slightly *through* the blue wall before rebounding? Like
> the wall is actually a little further away than it seems. Or maybe my
> brain expects the balls to bounce harder off the blue wall than they
> actually are. Hmm. 
> 
> Nifty animation -- both as a test, and as an inadvertent optical
> illusion! 

I'm not sure.  There shouldn't be any penetration.  But the blue wall 
does have high friction, as do the balls, therefore the balls don't 
bounce much off of the blue wall, but they do pick up a lot of spin as 
they fall downwards and rub against the wall.  This means that when they 
hit the ground, which has high friction on the right side as well, the 
balls' spin will make them move away from the blue wall, perhaps 
appearing to have bounced off of it.

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