Hidden polygons with zspheres?

[DigitalDreamer]

Hi all. First, some great images here lately. Here is a render of a snake that will be part of a scene I’m making. Please check the included thumbnails so you can see my problem. I’m exporting obj out of zbrush to render displacement in 3d max. After exporting level 1 obj, (b.t.w. i’ve tried level 2 and 3, same problem) I use Turbosmooth followed by the Displacement map. After the turbosmooth, there are strange geometry around the teeth. I’ve tried Flipping them in max, it works so far but then I can’t use the disp map cos geometry changed. I’ve also tried deleting the offending polys and noticed that there are hidden polys underneath. I’ve never come across this before, is this common when modelling with zspheres? Can anyone offer any solutions to fixing the teeth so that the zsphere/obj gets exported out of zbrush without the hidden polys which mess up my turbosmooth?

Please check the “offending” thumbnail attatchments.

Attachments

[Crusoe_the_Painter]

Where is the “Mother” zsphere located? The first zsphere you put down acts kinda funky when making a mesh from it. It needs to have at least 2 children, one ‘north’ and ‘south’, else you get some weird meshing if you use one. Is that zsphere in the middle of the body, or in the ‘nose’?

Judging from what yer seeing, this may be the issue.

[Jason_Belec]

I think Crusoe the Painter nailed it for you. I would happily look at the zsphere ztl for you if that is not the issue. Looks like it though. Nice snake!!

[saltapiedras]

Preciosa tu serpiente de piedra.

[DigitalDreamer]

Thanks guys for your input. I’m not sure where the mother sphere is located, I think it was the one behind his eyes ( the head ).
I’ve found a solution to the problem, but it means remodelling the details again.
As the sphere which was causing the problems was the one the teeth were “children” of. I used XYZ SCRIPT to change the xyz number of the sphere.
Of course doing this will change the topology of the model, so I loose all the details of the snake.
But I tested the new model with turbosmooth in max and now no detatched polygons. Next time I model, I should pay more attention to the number of children a zsphere has and use xyz script so that this doesn’t happen.
See the attached thumbnails. Hopefully this solution will help anyone else with similar problems.

Attachments

[Jason_Belec]

Yeah, that’s not the problem. Post your zsphere to me and I’ll take a look. The xyzscript is very useful, but your just masking the problem not solving it and it may come back to bite you later. I can’t promise I can save it, but it is better to solve than avoid. If you don’t want to post here, email to [email protected]

[DigitalDreamer]

Thanks Jason, I’ll send you an email with download link shortly.

[Crusoe_the_Painter]

If you have a low-res zsphere with 2 small children pulled WAAAY out, they produce “horns” that can intersect with each other, you get some crossed geometry which further subdivs don’t solve. That may have been the problem, as you show.