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Chipmunk Physics • View topic - How many shapes are surrounding another?

How many shapes are surrounding another?

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How many shapes are surrounding another?

Postby lautarov » Mon Apr 24, 2017 5:57 pm

Hi there! I started using chipmunk some weeks ago and I'm stuck with something that may be simple, but I can't solve it.
I want to know how many shapes are sorrounding another one (let's call it shapeA) within a certain distance.
My idea was to get the position of the body associated with shapeA (no problem with that) and then use cpSpacePointQuery, because it should call a func for each shape found along within a given distance. Then I can count how many times this func was called by cpSpacePointQuery.

But it didn't work, the program collapse when running with a segmentation fault (core dumped). When I build I don't receive errors nor warnings, and when I debug it says "#0 0x43421b cpSpatialIndexQuery(index=0x65b000, obj=0x7fffffffddb0, bb=..., func=0x434350 <NearestPointQuery>, data=0x0) (../include/chipmunk/cpSpatialIndex.h:210)

I haven't found an example of cpSpacePointQuery and I must be misunderstanding the headers. I've really checked the pointers declarations and initializations. Is it too much to ask a little example code for this? may be it's faster if I check the example and compare with my program.

Thank you!
lautarov
 
Posts: 8
Joined: Fri Apr 21, 2017 12:52 pm

Re: How many shapes are surrounding another?

Postby viblo » Sat May 20, 2017 5:36 am

Maybe you can try to make a simple example and paste here? Then its easier for us to see if/what is wrong. Unfortunately I mostly write python and use Chipmunk through the pymunk python library, so I dont have a ready example in C to show you.. But I know that its possible to make it work :)
http://www.pymunk.org - A python library built on top of Chipmunk to let you easily get cool 2d physics in your python game/app
viblo
 
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Re: How many shapes are surrounding another?

Postby lautarov » Sun Jun 04, 2017 5:35 pm

lautarov
 
Posts: 8
Joined: Fri Apr 21, 2017 12:52 pm

Re: How many shapes are surrounding another?

Postby viblo » Mon Jun 05, 2017 6:11 am

In general I would suggest to make a minimal example first (so just try with functionA that does nothing). Then you add one thing at a time until it breaks.

In this particular case I can see some strange things:

1. What is count in the counter function? A global variable?
2. Doesnt counter have the wrong type? Looks like it should have more parameters: https://chipmunk-physics.net/release/Ch ... eca9dfc257
3. What is space? You dont assign the space pointer to anything before calling cpSpacePointQuery.
4. Does functionA work? cpSpaceBodyIteratorFunc should also get a data argument: https://chipmunk-physics.net/release/Ch ... b8a742570e
http://www.pymunk.org - A python library built on top of Chipmunk to let you easily get cool 2d physics in your python game/app
viblo
 
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Re: How many shapes are surrounding another?

Postby lautarov » Mon Jun 12, 2017 12:48 pm

lautarov
 
Posts: 8
Joined: Fri Apr 21, 2017 12:52 pm

Re: How many shapes are surrounding another?

Postby viblo » Tue Jun 13, 2017 3:12 pm

Yes, its fine to pass NULL in case you dont have anything special to send in. However, in your case maybe you could just send the space there? Then you would have it easily available. Another option is to get the space from the body, and you can get the body from the shape. Check the docs for cpBodyGetSpace and cpShapeGetBody.
http://www.pymunk.org - A python library built on top of Chipmunk to let you easily get cool 2d physics in your python game/app
viblo
 
Posts: 206
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Re: How many shapes are surrounding another?

Postby lautarov » Thu Jun 22, 2017 4:41 pm

lautarov
 
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Joined: Fri Apr 21, 2017 12:52 pm


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