Boolean Difference Doesn't work

Hi,

Here is a part of my Code I've been spending a few hours on solving. I finally came to the point that I have no clue what causes the error.

Here's the code

doc.Objects.AddBrep(singleSubstract);
doc.Objects.AddBrep(singleVolumeToSubstractFrom);

Brep[] tempBrep = Brep.CreateBooleanDifference(singleSubstract, singleVolumeToSubstractFrom, tol);

tempBrep = Brep.CreateBooleanDifference(singleVolumeToSubstractFrom, singleSubstract, tol);

What it does basically is take to Breps (that are added to the document for debug reasons) and create the boolean difference.

In both cases "Brep.CreateBooleanDifference" returns "null".

But the volumes actually intersect and if I create the boolean difference manually in Rhino, both versions work.

Does anyone have a clue, why that might happen.

(tol is doc.ModelAbsoluteTolerance)

Thanks

- Martin

Attachments:

BooleanDifferenceError.3dm, 217 KB

Replies to This Discussion

Permalink Reply by Andrew Heumann on January 24, 2013 at 9:56am

It would be helpful to see your grasshopper document with the script to troubleshoot. When I use the following script:

private void RunScript(Brep x, Brep y, ref object A)
{
A = Brep.CreateBooleanDifference(x, y, 0.1);
}

The boolean is created correctly with the geometry you provided. This doesn't seem too different from what you're doing, so I don't know why you're running into trouble without seeing the actual script.

Permalink Reply by Mostapha Sadeghipour Roudsari on January 24, 2013 at 9:58am

I guess tolerance value is the key to make it to work or not.

Permalink Reply by David Rutten on January 24, 2013 at 9:59am

I cannot test a script at the moment as I broke the code editor, but if I reference those two shapes and use the Grasshopper Solid Difference components it also works. Can you confirm?

I don't see anything wrong with the code that might explain the nulls.

David Rutten

david@mcneel.com

Poprad, Slovakia

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