Reversing a Boolean operation.

[junoj]

I would like to reversing a Boolean operation if an error happens.

I have two solids that when I try to perform a Subtract Boolean Operation gives me an error. When the error happens I lose both solids. I would like to be able to reverse the subtraction in an event of an error so that I still have both solids.

Thank you in advance.

Dim Solid_1 as Solid3d = CreateSoldFromPl(plinePoints1)
Dim Solid_2 as Solid3d = CreateSoldFromPl(plinePoints1)

Try
    Solid_1.BooleanOperation(BooleanOperationType.BoolSubtract, Solid_2)
End Try

[fieldguy]

Have you tried "Catch"?  It looks as if you are not using a catch statement which is what it was designed for.

[_gile]

I do not konw anything about the 'CreateSoldFromPl' method, but it looks like you're substracting a solid to an indentical one (the same 'plinePoints1' argument for both 'Solid_1' and 'Solid_2').

[junoj]

Hi Fieldguy,

Yes I have tried the Try Catch , but it just catches the error. The solids are consumed after the unsuccessful subtraction.

[junoj]

Gilles,

Sorry, i just had a typo. The CreateSoldFromPL is just a function that creates a solid from polyline.

Updated Code

Dim Solid_1 as Solid3d = CreateSoldFromPl(plinePoints1)
Dim Solid_2 as Solid3d = CreateSoldFromPl(plinePoints2)

Try
    Solid_1.BooleanOperation(BooleanOperationType.BoolSubtract, Solid_2)
End Try

[junoj]

Sorry, I should have posted the error that i get:

The Boolean operation on solids failed.

Modeling Operation Error:

System inconsistency processing edge coincidence.

[Hallex · Accepted solution]

Citation

You should delete a smaller solid right after this line of code,
otherwise you leave a solid with degenerate geometry
(i.e. zero geometry) in the database and that could cause issues:
           
solid1.BooleanOperation(BooleanOperationType.BoolSubtract, solid2)

Add this line:

solid2.Erase()

tr.Commit() etc

Found this explanation in my code collection

[junoj]

Thank you Fieldguy, Gilles and Hallex.

I must have had a brain freeze. I was able to reverse it by using a nested transaction. This was my first time using a nested transaction . . .

Thank you again.

-J