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Chipmunk Physics • View topic - Trap Door?

Trap Door?

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Trap Door?

Postby ndizazzo » Fri Mar 18, 2011 7:34 pm

Hi all,

I'm using a switch to activate a trap door.

I have a segment shape in my world, attached with a pivot joint to the static world body. The segments body mass is 100.0f and the moment is set to INFINITY (so it doesn't rotate/move before it's supposed to). My code sends a signal to the trap door, which gets handled. The trap door responds by setting its moment to 2000.0f (which should allow it to rotate). This is all fine.

The problem is, however, when I set the moment in the event handler, the object doesn't respond like it should in the physical simulation.I can create the trap door with the moment NOT set to INFINITY, and the joint works as intended (but it rotates/falls immediately due to the fact that the moment is not INFINITY).

I've tried playing around with the moment and mass values with no luck. Any ideas?

Thanks.
ndizazzo
 
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Re: Trap Door?

Postby ndizazzo » Fri Mar 18, 2011 11:22 pm

ndizazzo
 
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Re: Trap Door?

Postby ndizazzo » Sat Mar 19, 2011 2:05 am

So - I've made a bit more progress on this, except I'm running into some weird stuff when I pin the trap door on the RIGHT rather the left. Check out the videos. Sorry for the bad quality, needed it quick.

The first video is the segment shape being pinned on the left and constrained to 0 and M_PI_2... Its normal! yay!

http://www.facebook.com/video/video.php?v=989480426711

The second video is the same segment shape being pinned on the right and constrained to -M_PI_2 and 0 ... what the heck.

http://www.facebook.com/video/video.php?v=989480686191

In the second video, I didn't change ANYTHING except the location of the pin, and the rotary limit joint constraints... which leads me to believe that the constraint is making it go all crazy. Any ideas why?
ndizazzo
 
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Re: Trap Door?

Postby slembcke » Sat Mar 19, 2011 10:56 am

Are you sure you got the order of the minimum and maximum correct in the code? If you swap them, bad things will happen, much like the video you just posted actually.
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Re: Trap Door?

Postby ndizazzo » Sun Mar 20, 2011 2:18 am

ndizazzo
 
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Re: Trap Door?

Postby slembcke » Sun Mar 20, 2011 1:52 pm

Hmm. What was the crash?
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Re: Trap Door?

Postby ndizazzo » Mon Mar 21, 2011 2:33 am

ndizazzo
 
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Re: Trap Door?

Postby ndizazzo » Mon Mar 21, 2011 3:22 am

I've been playing with these values for hours.... -M_PI_2 and 0 are the only ones which give me what I want. It just seems like it gets an extreme angular momentum for some reason :\

I tried moving the pivot joint around:

- When it was in the center, I didn't get that sporadic jumping behavior
- When it's 2/3 of the way through the trap door, it bounces once, then comes to rest, begins bouncing slowly until it is bouncing wildly again (like in the video)

It seems like as soon as the joint and constraint get to its limit and it comes time to bounce, the effect of the joint being constrained when it "hits" the bottom is what causes it to bounce back up but whatever value Chipmunk is giving it for its velocity is WAY off the chart. Not sure why :(
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Re: Trap Door?

Postby ndizazzo » Mon Mar 21, 2011 3:58 am

ndizazzo
 
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