help required with modeling void form cone

[ikonome]

Hope some one could kindly offer me some help, attached is a common cuboid,
I made a void cone with the vertex along one of the edge of the cuboid aimed to cut the cuboid.

but the problem is, if the vertex angle is very sharp, it will inform me that Revit Can't keep elements joined.
then I can't cut.

but if I sslightly move away the cone from the edge, everything works fine.even inside the cuboid.
and If the vertex angle is larger or say with lower slope, it also works.

20120201 19 5.png (http://forums.augi.com/attachment.php?attachmentid=84027&stc=1&d=1328098591) is the offset one ,
20120201 20 11.png (http://forums.augi.com/attachment.php?attachmentid=84028&stc=1&d=1328098591) is the one with larger vertex angle,
these two both works well

20120201 20 9.png is the one with very sharp vertex angle I have problem with

bug1Family1.rfa (http://forums.augi.com/attachment.php?attachmentid=84029&stc=1&d=1328098627) is model which I have problem with.

[CADastrophe]

Try adjusting the profile of the void so that it doesn't have such sharp angles, as per the attached image.

[ikonome]

Try adjusting the profile of the void so that it doesn't have such sharp angles, as per the attached image.

Thank you,
yet I wanna know the cause of this problem, some system limitation or so.
It's really hard to predict the result in revit mass.:cry:

[tomnewsom]

Thank you,
yet I wanna know the cause of this problem, some system limitation or so.
It's really hard to predict the result in revit mass.:cry:
Revit doesn't like lines that end/meet right on a tangent. No idea why - I reckon a zero gets into the calculations where it shouldn't be.

Anyway, when carving or joining, try not to have the join line at the end of a curve, where the other piece meets it at an exact tangent. Extend one piece beyond the other, to give some 'overlap'

[ikonome]

Revit doesn't like lines that end/meet right on a tangent. No idea why - I reckon a zero gets into the calculations where it shouldn't be.

Anyway, when carving or joining, try not to have the join line at the end of a curve, where the other piece meets it at an exact tangent. Extend one piece beyond the other, to give some 'overlap'

thanks, I will follow your suggestion ;)