Welcome to Autodesk’s Meshmixer Forums. Share your knowledge, ask questions, and explore popular Meshmixer topics.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Boolean Union Error...

Message 1 of 4
3494 Views, 3 Replies

Boolean Union Error...

Hey guys !
Been playing with MM for a project of mine, but I'm stuck for a couple of nights on one error I can't manage to solve.
I'm trying to merge two objects by Boolean Union... But I keep having errors no matter how much I try.

I've read somewhere that remeshing your 2 objects by Linearsubdivison helps, so I did it but I keep having this red result in the end.

I'll link the pictures to the post of the two items I'm trying to merge and the results after boolean union. Any idea is welcome !


Thanks a lot


union voulue 1.pngunion voulue 2.pngunion voulue 3.pngrésultat erreur union remeshé 2.pngrésultat erreur union remeshé.png

Message 2 of 4
in reply to: Anonymous

Nothing, double post

Message 3 of 4
in reply to: Anonymous

Booleans search for the intersection line(s) of two meshes A and B . A problem rises if there are identical topology regions on both meshes (e.g. the plane region on your meshes shown in the first image). Here MM can't decide whether to use the surface of A or of B. This conflict results in too many (maybe infinite) intersection lines.

BooleanDifference can handle such identical (coplanar) surfaces if you enable HandleCo-Planarity and set the Delta value right. Compare: MM Booleans and its Handle Co-Planarity section.

Unfortunately this doesn't work for Union or Intersection.


So you'll need to avoid such identical regions on the to be joined meshes using BooleanUnion. Often a minimal offset is enough. 

As an alternative you might combine both objects and run MakeSolid on it. If you set its SolidType to SharpEdgePreserve and a high enough SolidAccuracy- and MeshDensity-values this should result in a nicely merged surface.



Gunter Weber
Triangle Artisan

Message 4 of 4
in reply to: MagWeb

Thanks a LOT.

I learned a lot about Boolean thanks to your answer and reading the MM wiki.
Actually, I read it before but couldn't understand a thing for some reason Man LOL your message made it clearer.


Here is the final result after combine + make solid sharpedgepreservation.
I set the mesh densisty and solidaccuracy at 300.


Thanks again !

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report