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Split symmetrical parts with high polycount

ZBrush Usage Questions
#1

Hello,

I’m working on a project with symmetrical objects along the x-axis.
I have the left and right parts of the object in one subtool to be able to make the details symmetrically.
Now I’m working on the 6. subdivision-level with about 14 million polygons.
Before making the last details, I tried, if it is later possible to split the right and the left part into two subtools when ready.

And here is the problem: There are too many polygons to split. If I delete the 6th. subdivision-level, I’m able to split. But then I’m not able to put the details symmetrically on both parts, because I have too few polygons in subdivision-level 5.
Storing the 6th-subdivision-level as morph-target and trying to get the exact details back after splitting also doesn’t work.
As the object is complex, projection also gives wired results.

So how can I split with all the details? I have 16 GB memory and the problem occus with about 14 Mio polygons.

Thanks

mawag01

#2

HD Geometry could help. That’s a lot of points. You could split in half, model one side then mirror and weld, but maybe not with HD Geo. More subtools is usually better.

#3

Hide half the mesh and try tool.geometry.modify topology.delete hidden. I believe you have to blow out your subD levels for this, but you should be able to reconstruct them after the deletion.

#4

@ betachannel

duplicate subtool, delete lower subdivision-levels and then deleting the left part on one and the right part at the second subtool works. Then reconstructing the lower subdivision-levels.
But then, the level one is no more identical to the level one of the original mesh. I have to work on both (the left and the right) again, because the object I’m producing covers another object, and after this procedure, in level one the covered object looks through the the just altered subtool. So I have to work on both new subtools in levvel one seperately and so the left and right level one are no more exactly mirrored. That’S my problem.
I hope, you understand my words her, it’s difficult for me to describe in english.

mawag01

#5

Nope. Can you show a picture?

#6

Hello betachannel,

I try to explane in other words, I think it’s more simple than making pics with only marginal difference:
When I want to delete one part of a subtool with high subdivisionlevels, I first have to delete the lower subdivisionlevels.
Then I can delete the part I want.
After that, I can reconstruct my subdivisionlevels. But: My base-mesh at level 1 is no more the same as before. It of course has the same number of polygons and vertices, but it differs a little bit in shape to the base-mesh before this procedure.
And! It has an other order of the vertices / polygons, so I can’t restore the exact form of the previous base-mesh, for example stored as morph-target before this procedure.

mawag01