MatCap based on shader nodes

MatCap is a material with just one texture, but it allows to quickly and conveniently show how a mesh will look with a certain material and in a certain light. When we assign a MatCap by selecting it in the 3D viewport shading options (Shading - Lighting - MatCap), the MatCap is assigned to all objects in the scene at once. However, if we need to selectively assign a MatCap to some meshes, MatCap can be emulated using shader nodes.

Read more: https://b3d.interplanety.org/en/matcap-based-on-shader-nodes/