The NPRShader performs a Non Photorealistic Render. It features 5 layers or “pencils” so you can “paint” in 5 different flavours in the same pass: For example, you can paint the first layer with plain colors, and then add the next 3 layers as charcoal style, painting each one in a different direction and using different colors, opacities..
The NPRShader features also controls that will help in achieving effects commonly used when you draw by hand, like distance faking using a different pressure of your brush, or more water in your watercolors. Different Modes include: 2DLines, 3DLines, Plain, Ink, Pointillism & Charcoal.