Everything looks fine until i use ZRemesher. What should i do? I want to have identical topology and no changes in the bottom section of the tool.
Thanks
[https://streamable.com/75b2ey]
Hello @Passerby,
It looks like you have symmetry active along the wrong axis. Change the Symmetry axis in the Symmetry section of the Transform menu.
Note that a tool must actually be symmetrical along one or more world axes for symmetry to work. You can visualize the symmetry planes by turning on the floor grid, and making certain that the elevation is set to zero in the Draw palette. The tool will mirror itself on both sides of one or more of those planes when those axes are selected. If the tool is not already symmetrical on both sides of one or more of those planes, then the form will be altered to force symmetry if you ZRemesh with Symmetry active.
If you turn on Local Symmetry (L.Sym), the subtool will mirror itself across the center of its local bounding box instead of the global center.
Hi @Spyndel and thank you for your reply.
So you’re saying that in ZBrush having an identical topology is not possible when we have a tool that has been arrayed in one axis?
Because the thing that happens to the tool after using the brush is the exact same thing that i’m looking for, but as you can see, the result is not what i want when i use ZRemesher after sculpting.
It depends on if the tool is symmetrical in itself (identical on both sides of the mesh’s own center line). If it is, and it has not been rotated off-axis, then you can mirror from side to side using Local Symmetry as explained above. This works for tools that are symmetrical across their own center, but have been offset from the global/tool center.
An example of this is a sphere. A perfect sphere is symmetrical in itself across all of its local axes. When you first draw it out it is located at the tool/world center, so it is also globally symmetrical. If you move the sphere to the right away from the tool center, it will no longer be globally symmetrical. If no part of that sphere touches the tool center and you use a global mirror and weld operation on it, then the sphere will be duplicated across the center plane, resulting in two identical spheres on both sides with a gap in between. If you switch on Local Symmetry, and the sphere has been offset (but not rotated!) away from the center, then the symmetry operation will result in changes mirroring across the sphere itself from side to side, because the operation then uses the sphere’s own center.
I can’t tell exactly what you want to do from the video, or even if your mesh is symmetrical in itself, but I’ve explained how to see what your options for global symmetry are. Switch on the floor plane, make sure the elevation is zeroed out. Those are your global symmetry mirror axes. If your mesh is not identical on both sides of one or more of those axes, then your tool is not globally symmetrical, and global symmetry operations either won’t work on it, or will force a change in the tool’s form to make it symmetrical. Switching on global symmetry when using ZRemesher will force ZRemesher to mirror the geometry across the specified axis. The resulting tool then will be globally symmetrical, even if it is not the result you want.
To force a tool into symmetry, move it so the desired center is at the center of the desired axis plane, and use Tool> Geometry> Modify Topology> Mirror and Weld.
ArrayMesh has features for mirroring operations across specified axes to result in a symmetrical tool.
Thank you @Spyndel for your reply and sorry for my delay.
What i was editing is a ring, that has been arrayed in Z axis in rhinoceros. What i want to happen is that when i’m done with editing the tool, i want to have a better radial symmetry topology after editing, so i use zremesher.
I want the bottom side of the ring to stay the way it is (half of a circle) and also having the top section the way it becomes.
But as you can see when i use zremesher the bottom section of the ring is changing to the top section in a way that i don’t want it, because it’s not a ring anymore.
In the picture you can see what i use as symmetry option.
I hope this time it becomes clear that what i’m looking for.
Regards
Make your mesh symmetrical as described above in order to work with symmetry functions. It must be identical either on both sides of the relevant axis at the tool/world center, or identical on both sides of its own center in order to work with local symmetry (L.Sym).
One thing to note is that the symmetrical functions used by Mirror and Weld and ZRemesher only work in once direction, so in some cases you may first need to flip the mesh to the other side of the desired axis with Tool> Deformation> Mirror, in order for the correct side to be mirrored to the other.
Hi @passerby
It’s really hard to tell exactly what you mean in the video you provided. Perhaps it might be better if you posted a couple of images of the actual Tool you are referring to, one before using ZRemesher and one after using ZRemesher and indicate on the images exactly what changes ZRemesher is doing that you don’t want to happen.