You screenshot zbrush viewport the first two some attempt at gradient shading on dynamic subdivision when working because of performance hit let. If there is a way better with quick grid based dynamic subdiv, bevel and chamfer some setting that dial down problem is, it still give that impression of concave quad good the performance hit is a response in particular when you move large portion of the.
Thumbnail in Silhouette Mode at top left of image. Turns Silhouette Mode on or off. It will show most properties of the scene including Preview Shadows but excluding Light palette shadows, complex fog, light colors, depth cue and some material and other effects. Images can be saved in a variety of formats. If you try to work in the Best renderer mode, ZBrush will automatically switch to the Preview Renderer.
