Zbrush noise - why you no work correctly?

karmiclychee

I've got this maddening issue with Zbrush. I just want to do a quick and easy brushed metal effect on a plaque and it's giving me grief. This occurs every now and then and I have no idea why.

Instead of distributing noise all over the piece, it just plops this obnoxious patch in the middle of the model. This is what the preview shows, as well.

Any ideas? I have a feeling my model might just be too big, but I thought scale was arbitrary?

altermind

it looks like you have no UV map

dirigible

Scale isn't actually arbitrary. Zbrush has an internal scale that it uses. If you import an obj, it automatically adjusts the model to fit inside zbrush's internal scale. But if you goZ a model it does NOT automatically adjust.
That's what you have going on with your model. It's enormous compared to zbrush's internal scale, so it actually goes past the bounding box of surface noise.

Solution: Create a default zbrush sphere. Append your model to that ztool. This will force zbrush to adjust your model to fit the scale. After that, just delete the zbrush sphere and save.

Note that when zbrush adjusts your model to fit it's scale, you don't have to worry about exporting and getting a tiny model. It will automatically de-adjust when you export.

Froyok

dirigible wrote: »

If you import an obj, it automatically adjusts the model to fit inside zbrush's internal scale.

Are you sure about that ? Because I can import obj files and export them without rescaling (even when losing data with dynamesh). There is inside zBrush a function to rescale your mesh to the zBrush regular units but I never seen zBrush doing it automatically.

cryrid

The values are likely stored with the tool itself, so dynameshing shouldn't lose that data (Tool: Export: Scale?). It should automatically scale back to the correct size on export, which is why you don't have to compensate.

Froyok

cryrid wrote: »

The values are likely stored with the tool itself, so dynameshing shouldn't lose that data (Tool: Export: Scale?). It should automatically scale back to the correct size on export, which is why you don't have to compensate.

Ha indeed, that's interesting, I never pay attention to this behavior before.