Pixel to Polygon Ratio

From ZBrush Info

To understand how polypainting works, first consider a 2048 by 2048 texture map, which provides reasonable resolution. It has a total of a little over 4 million pixels.

The new version of ZBrush is fast enough to handle models with large polygon counts. If you work with a 4 million polygon model, then in terms of surface painting, simply assigning each polygon a uniform color gives the same amount of information as the 4 million pixel texture map. (Actually, somewhat more, since significant parts of texture maps are typically left blank.)

So, with polypainting, you can put all of the painting details directly onto the model's polygons, and then transfer that detail to a texture map when the painting is complete.

To Learn how to Set up your Model for Polypainting Click Here.

To Learn About Painting with Sculpting Brushes Click Here.

To Learn About Painting with a Texture Map Click Here.

To Learn how to Convert a Texture into PolyPainting Click Here.

To Learn About Baking PolyPainting into a Texture Map Click Here.