ZBrushCentral

Help - Shell and ammonites in zbrush

Hi all,
I have a problem with sculpt snail, ammonites and nautilus. I know that in brush there are two tool “spiral3d” and “helix3d” and they can be modified by the “initialize” button but I have some difficulties to customize them.
For example if increase the spire (coverage button) the aperture decrease until to make disappear the opening.
Do you know a method to sculpt this objects in zbrush? Thanks a lot and excuse me for my bad english.

Attachments

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Schermata 2016-07-19 alle 12.28.30.jpg

Schermata 2016-07-19 alle 12.28.38.jpg