Tutorial 91 - Cool Light, Warm Shadows (Patreon)

This scene is the opposite lighting setup to the scene in tutorial 90. 

This time the primary light is cool and the ambient light is warm. It might be unusual to find this situation in nature. Perhaps the red autumn leaves (warm) of a forest lit by the moon (cool) would create such an effect. Or a the cold light of a flashlight in a red brick alleyway. 

Important to know, when a colored light hits the surface of an object which is similar in hue to the light source, we see an increase in saturation and value, making the object appear more intense in color. Red light makes red objects more red, for example. 

It's interesting to note that the grey in the shadows is caused by the interaction of the warm red ambient light on the surface of the cyan ball. We'll discuss this in the next tutorial.