How do I slice physic object and calculate the pieces?

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- odiusfly
- - Joined 15 Jul, 2014
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- 15 May, 2023
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Hello guys! I'm not sure, i have find a project at past, maybe R0J0hound was this example, anyway. Is there any example to slice a physic object to pieces and calculate the pieces?
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,280 posts
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- 17 May, 2023
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It was posted before but I couldn’t find where. So there’s this.

dropbox.com/s/i7vrebn55xor8p5/mesh_slice.c3p
- odiusfly
- - Joined 15 Jul, 2014
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- 17 May, 2023
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Thanks R0J0hound !

Is there any way to calculate the pieces (as my example in the image above)?

Thanks again!
- oosyrag
- - Joined 20 Feb, 2013
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- 17 May, 2023
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That's tricky, if the shapes can be anything. I imagine using the canvas plugin to take a snapshot, then count contiguous pixels with a flood fill would be a straightforward way to go about it.

Edit: or rather than a flood fill, sizing the canvas to fit the shape and scanning line by line would be even more straightforward.
- odiusfly
- - Joined 15 Jul, 2014
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- 17 May, 2023
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If i remember right, there was an example at past with this and works fine. Maybe was from R0J0hound or someone else.
- R0J0hound
- - Joined 15 Jun, 2009
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- 17 May, 2023
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You mean calculating the area of the shapes? The arrays have all the points of the shapes. You’d just need to loop over each edge with something like this
Area=0 Repeat p.count times — add (p(i+1).y+p(i).y)*(p(i+1).x-p(i).x)/2 to area

At least that’s the idea. It would have to be adapted to an array. And the I+1 would need to wrap around to 0 when past the end of the array.
- odiusfly
- - Joined 15 Jul, 2014
  - 92 topics • 500 posts
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- 18 May, 2023
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What i mean is the original shape and the pieces.

Original shape = 100%

We cut it to X piece and go away.

So original shape now = 90%

etc etc

I will try this method you wrote. Thanks R0J0hound !
- odiusfly
- - Joined 15 Jul, 2014
  - 92 topics • 500 posts
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- 22 May, 2023
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Hello R0J0hound ! I try your example without any luck.

If you find some free time, can you please share a worked example?

Thanks again!
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- odiusfly
- - Joined 15 Jul, 2014
  - 92 topics • 500 posts
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- 1 Jun, 2023
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Any help, anyone? Thanks again!