OT: RE: [Algorithms] Skeletal animation blending artefacts

[Tyson J. <twj...@sa...>]

Um, in a military simulation, I doubt anyone would care about the spider
feet going into the floor.  They'd be more concerned as to where
Al-Qaeda got the giant spider! :)

IK is nice for IK problems.  Interpenetration is more a collision-volume
not-working problem.  

-----Original Message-----
From: gda...@li...
[mailto:gda...@li...] On Behalf Of Nick
Pelling
Sent: Tuesday, December 10, 2002 3:05 AM
To: 'gda...@li...'
Subject: RE: [Algorithms] Skeletal animation blending artefacts

I'm not knocking IK, it's just that I've only ever had anything
approaching
a problem with quat interpolation in about 0.001% of cases, and then
only
fleetingly.

These are for computer games, right? That giant spider isn't being used
for
a military Al-Qaeda-giant-spider-invasion-of-America simulation, where
the
spider foot occasionally penetrating the floor would compromise
everything?

Sure, piledrivers are great too: but I prefer nutcrackers when trying to
stay within budget etc. And for eating nuts, of course. :-)

Cheers, .....Nick Pelling.....


-----Original Message-----
From: Jon Watte [mailto:hp...@mi...]
Sent: 09 December 2002 22:10
To: gda...@li...
Subject: RE: [Algorithms] Skeletal animation blending artefacts

> To stop a stupid spider's stupid feet very occasionally 
> penetrating into the
> floor, you could just clip the height of any transformed vertices 
> so that it
> never goes below the level of the floor.

That will look almost exactly like penetration.

I think the easiest thing to do is to offset the spider upwards so 
it's not penetrating. The second easiest, and I believe by far the 
best-looking, would be an IK solver on each leg to put the feet on 
the floor. Note that this is NOT a "generic-coffee_maker" IK 
solution, with all those problems; this is a specific, constrained 
IK solution which can be made to look good with finite effort.

> Of course, if you've been looking for an flimsy excuse to do IK 
> for a while,
> then go for it. :-)

If you can re-use that IK for all your animated characters, and 
finally get rid of that horrible foot sliding, then you have done 
all your players a great service. Or perhaps I'm just ultra 
sensitive to this problem.


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