You can create a new Subtool from a mask in ZBrush using the Extract function. Here's a breakdown of the process:
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Mask the Area: First, mask the area on your existing Subtool that you want to turn into a new Subtool. You can use various masking brushes and techniques to achieve the desired shape.
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Access the Extract Options: Go to the "Subtool" palette. Look for the "Extract" section.
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Adjust Thickness and Options: Within the "Extract" section, you'll find settings such as "Thickness." Adjust the thickness value to determine how far the new Subtool will be extracted from the original surface. You can also find options to smooth the extracted mesh or double-sided it for easier editing.
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Extract the Subtool: Click the "Extract" button. ZBrush will calculate the new mesh based on your mask and the thickness settings. It will appear as a preview.
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Accept the Extraction: If you're satisfied with the preview, click the "Accept" button. This will create a new Subtool based on the masked area. If not, you can adjust the settings and extract again.
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Cleanup (Optional): Often, the extracted mesh isn't perfect.
- ZRemesher: It's generally a good practice to use ZRemesher on the new Subtool to optimize its topology. This will give you a cleaner mesh to work with. Navigate to ZRemesher under the Geometry Tab of the Subtool palette and click "ZRemesher". Adjust settings as necessary for desired polycount.
- Smoothing: Depending on the settings used during extraction, you might need to smooth the surface further.
- Further Sculpting: You may also want to further refine the shape and details with standard ZBrush sculpting tools.
In summary, masking an area, using the Extract function, and then refining the resulting mesh allows you to efficiently create new Subtools based on existing geometry within ZBrush.
