In this quick tutorial, I cover the creation of a custom brush in ZBrush to create 'skin scars'
1. Building custom assets in ZBrush, like brushes, is pretty simple. Changing some very basic settings can drastically change the behaviour and effect of a ‘Standard’ brush.
2. With the standard brush, you can turn off ‘Zadd’ and turn on ‘Zsub’ to invert the effect. ‘LazyMouse’ gives you lots of control over the stroke but turning it off will give you a smoother effect.
3. Create a custom alpha to further tweak the brush. Hold CTRL+Left Click on the undo history to record a clean state of your mesh, then add details with your custom brush, press ‘G’ and click and Drag with the ‘XTractorDragRec’ brush to create a custom alpha
4. After tweaking the basics of the brush and creating your own alpha (selecting the one created with the ‘XTractor brush’), you can further refine the way that the effect of the brush is applied from the Stroke palette by changing to a different stroke type
5. For more advanced settings, you can play around with the ‘Roll’ and the ‘Roll distance’ attributes from the stroke palette to stretch the alpha across the stroke. From the Brush palette > Orientation, try modifying the ‘SpinAngle’ and ‘SpinRate’
6. Finally, you can test how the brush behaves when adding some ‘Trails’ (Brush palette > Modifiers > Trails). This setting applies multiple instances of the brush at once over the stroke so it increases the ‘Intensity’ but gives you very smooth results.