Creating a shadeless material in Cycles

In this recipe, we will create a shadeless material, which is a material that behaves as self-illuminated but does not actually emit any light on the nearby objects.

In the following screenshot, we can see the difference between a Plane with a shadeless material and a Plane with an emitting material:

Creating a shadeless material in Cycles

A shadeless Plane and an emitting Plane in comparison

At the top, the cloudy sky image is perfectly self-illuminated and visible, but it's neither affecting the Spheres or the Suzannes nor the floor Plane (nevertheless slightly visible because of a low intensity World).

This is the reason a shadeless material is perfect ...

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