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Thread: Void does not cut the Solid - A thousand dollars question

  1. #1
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    Void does not cut the Solid - A thousand dollars question

    Mannn, this is frustrating. I remember in revit 2009 It would be easier to do this.

    After reading many posts I realized there is no solution for certain limitations of Revit.

    Im trying to cut a solid with a void, but it keeps saying that it is not possible. I love revit but sometimes it seems the software has a mind of its own, and today he is very moody. It needs to cut right in that position, because that form is a specific part of the project.

    Please if anyone can help me and tell me how to cut the solid and what am I doing wrong.

    I changed the void to solid in the end so I could save the file and send you.
    Attached Thumbnails Attached Thumbnails Void does not cut the Solid - A thousand dollars question-solid-cut.jpg  
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  2. #2
    Forum Co-Founder Alfredo Medina's Avatar
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    Welcome to the forum.

    The way in which the profiles of these two forms approach each other does not leave enough volume to cut; the profiles of these irregular forms slightly touch each other at their edges. The void operation needs something to cut, some "meat". If you move the profiles of one of the forms to be more inside the other, as shown on this image, the irregular void form immediately cuts the irregular solid, without even using Cut Geometry.

    About the thousand dollars, just keep them for the next fundraising campaign of Revitforum.
    Attached Thumbnails Attached Thumbnails Void does not cut the Solid - A thousand dollars question-2015-06-02_23-19-42.jpg  
    Last edited by Alfredo Medina; June 3rd, 2015 at 03:35 AM.

  3. #3
    Member byk3bep's Avatar
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    Quote Originally Posted by Alfredo Medina View Post
    The way in which the profiles of these two forms approach each other does not leave enough volume to cut; the profiles of these irregular forms slightly touch each other at their edges. The void operation needs something to cut, some "meat". If you move the profiles of one of the forms to be more inside the other, as shown on this image, the irregular void form immediately cuts the irregular solid, without even using Cut Geometry...

    I might not have understood, but...
    (at the risk of angering the founders )... here goes>

    I think this solves nothing since the goal is to have the cut in the exact place the OP defined. Therefore no moving of the geometry is allowed, and it looks like there is more then enough "meat" for cutting.

    I came to a solution, witch would have evaded me if not for Alfredos referring image.

    For some reason it seams that the ref line used for path sweep, and the tangency condition messes it all up. I do not have a deeper understanding of this behavior. To resolve the issue, the only thing you need to do is offset it an arbitrary distance. In the example it was 20 i think... Create the form using the newly created R.L. and the end profiles (there is no need for the mid profile). Allsow I deleted some of the redundant geometry...

    Now switch the solid mass to void and it will cut with no errors.

    As for the I found it to be the best way to take the wall down

    Void does not cut the Solid - A thousand dollars question-voidfix.jpg

    And welcome to the forum
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    Last edited by byk3bep; June 5th, 2015 at 05:54 AM.

  4. #4
    Forum Co-Founder Alfredo Medina's Avatar
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    Excellent. Yesterday, I had the idea that the location of the reference line had to do something with the problem, so I tried to move it without moving the profiles. Because I saw that in plan view the reference line that creates the path was going to the edge of the void, so I thought that this was the only cause of the problem. So I moved the path a little bit without moving the profiles, but the result failed again. Maybe I should have tried other locations. So I thought that the problem was also due to the irregularity of the profile not being more enclosed within the volume of the void, so, yes, I had to break the rule of the question, moving the path and the profiles a little bit more inside. I am glad to see to see that you were able to solve it without braking the rule.

    The thousand dollars go for you, or we can split them.

  5. #5
    Mr. Revit OpEd
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    Revit hates slivers and forms that intersect themselves. I find one of those is at the root of all the issues I run into like this.

    A sliver can happen when the void form barely touches the form it must cut. It might look fine to our eyes but Revit doesn't see it that way.
    Self-intersection happens when the path of a sweep causes the profile of the form to overlap itself, typically in corners as the path changes direction. These can often be resolved by changing where the path is defined or moving the profile relative to the path.

    As described in the subsequent posts, adjusting where the path and profile travel influenced how the void intersects the volume. I haven't looked at the family myself but based on the descriptions I suspect this is an example of a sliver issue caused by how the void interacts with the path/profile of the form.

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