hello there,
so as you can see in the pic, each time I try to bridge the two edges in blue, the polygon created is kinda twisted or something like this.
any explanation or solution?
thankyou
Hello @ZIANI_S
I’ll assume you are trying to use the Edge> Bridge> Edges action in Z Modeler. If attempting to use any other function, please specify. For the record, this function works for me without issue:
This is probably some sort of issue with your geometry, or your target accuracy. It is difficult to get a good look at your geometry in these pics.
First off, disable “Double” in Tool > Display Properties. Double sided geometry can sometimes obscure issues with a mesh, and make it more difficult to target specific geometry accurately. One possibility is that you have some sort of problem with flipped normals, and that the different sections of the mesh are actually facing opposite directions, resulting in that twisted polygon when you try to join them. Flipped normals will become apparent when you disable double as any polygons that are actually facing the other way will look like “holes” in the mesh.
Another tip is to reduce the size of the ZModeler brush radius to make certain you are actually targeting your intended element.
Finally, try enabling Dynamic Subdivision for your low poly mesh. This will apply a virtual smoothing to the mesh, and may reveal issues that arent apparent otherwise, like edges that are too close together to be seen by the naked eye normally, and may be resulting in you clicking the wrong target.
These steps may help you to find the issue with your mesh. If you still can’t sort out the problem, check back in and we can take further steps.
Good luck! 
hi @Spyndel
exactly that’s what I’m using, the Edge> Bridge> Edges action in Z Modeler.
I already tried every possibility you had mentioned, and unfortunately the problem still there.
so I decided to go another way, is to delete the whole loop of polys and then just stitch each vertex one by one lol, tedious but working.
thank you a bunch for your detailed answer.
If you have a tool with which you can reliably reproduce this issue, and can detect no other defect with the mesh, this should be submitted to Pixologic Support.
Good luck!
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Invert normals on one part of the mesh will fix this issue.