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Another light in our lighting arsenal is the Hemisphere light. The Hemi light is a directional light and it has a fall-off distance like all the other lights. What makes the Hemi different is that it does not have a shadow. It cannot cast a shadow and so all of the light coming from it is very soft and makes an excellent fill light. When I use it as a very high intense level, it provides a very even lighting across the entire surface.
As you can see, there is no shadows. In real life motion, picture and photography, you usually have a guy walk right in front of the actor backwards with a big white plain, and that's too reflect any diffused sunlight back on to the actor's face and the use of the Hemi light is very commonly used to do that to provide a nice even fill. The other way you use a Hemi light is for side light or fill light to round out the shadows and to soften the shadows on the character, so there aren't a lot of hard noticeable shadows and the character has a nice even lighting to him or her.
The Hemi light can also be used in negative mode just like all other lights, to actually take away light. Now you can see this Hemi light is actually darkening the front of him, while the side Hemi light, which is positive, is actually lighting him up. So you can use the Hemi light up tight and up close on the actor, and it will give him a real sullen look like if you are going for a Vampire or some kind of dark character. You can use this pointing upwards like you use to do with flash lights around the campfire if you even want to do that, to highlight the under side of the cheek bones and the eye ridges.
So in this video we saw a little bit about the Hemi light and how it rounds out the lighting rig and provides additional supplemental lighting that you can play with to use to provide better even balanced lighting to your character.
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