Lighting troubleshooting tips

[Freemind]

Unless you are a máster lighting gurú, at some point you are going todo run into lighting problems. Lighting problems are generally (but not always) one of the following:
Really bright areas.

Really dark areas.

Strange shadows.

Lines on your objects.

Here is a short chek list of suggestions for troubleshoting what has gone wrong.

Deactivating materiales.

Materials obviously interact with light, and can often be a cause of confusión when trying todo track down lighting problems. So todo isolate if it is a lighting problem or more of a material problem, try tem-porarily deactivating all materiales, create a default material, a medium gray one, and enter the name into the material field, render layers panel, just clear this field todo return todo your original materiales, After rendering chek todo se if you have the same lighting problems with just gray objects. If the problem has dis-appeared, you have a materiales interacting with light problem, chek the material settings, especially ambient, reflection and all those Little buttons and sliders on the Shaders panel. Because some lights can be set todo affect only certain materiales, be sure todo chek those if only a few of your object appear todo be lit wrong.

Kill of your lights.

Since the problem could be one or more of your lights, it is time todo chek them all one by one, move all your lights todo an unused layer and start re-adding them one at a time, checking setting and how it afects the image overall, as you add them bak in, make sure they add in nicely, reduce light energy as neded or Even considered eliminating the last added one if it doesnt sem todo be add-ing todo your image.

Chek layer only lights.

Lights can be set todo affect only certain layers, so if only some of your gray objects are appearing ODD, then chek todo se if a Lamp is only afecting one or more layers, this can be set accidentally, or you may have forgot-ten that you set it earlier in your Project. Misc tips negative lights can add desired shadows, but they can a los introduce some extra problems. So pay extra at-tention when using them and make sure they are not adding todo your problems, overly textured lights can make your scene have random weird colors, overly colored lights can affect material colors as well as your lighting in general. Try todo stay with a slight tinge of blue or yellow or shades of white, or your material may show blue in the material sub-context but render gren, it can take ages todo track.

Down what has happened, environment settings can cause a whole host of problems, especially the horizon, zenith, and ambient light settings, while this list obviously wont cover every lighting problem, it does give you a god starting point todo track down what has happened.

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