In the Render & Camera Settings, there are multiple options that applies to Lighting & Shadows. Changing the settings for Lighting & Shadows can have a great effect on your renderings, making them look quite different from one another. For example, it is possible to mimic the way the light shines through windows at different times of the day, or create a feeling of dusk or night.
Selecting either the Medium or the High render quality at the top of this dialog will show an Emissive background checkbox in this section. Leaving this box checked, which is the default setting and recommended in most cases, will add a lot of additional light onto the scene during rendering. This is mostly a good thing that contributes to realistic-looking renderings, but open scenes with very bright colors, textures, and models could render too bright. If this is the case, try deselecting the emissive background. Note that if you are working on a closed room with walls and ceiling, the emissive background will have very little or no effect at all. In this situation, you will need to work with other light sources, such as the camera light or the ceiling with integrated lights, to achieve good lighting.
Total: will increase or
decrease the intensity of all light sources in the Render
& Camera Settings dialog (i.e. Ambient, Camera, and Sunlight).
Ambient: this light only becomes available using the Real Time or Fast rendering options, and then serves as a background light that illuminates everything in the drawing.
Sunlight: controls the simulated sunlight that can be adjusted by altering the direction and angle of the sun further down.
Camera: controls the light that originates from the position of the camera.
Select if you want the sun to cast hard shadows or no shadows at all.
Spinning the Direction wheel will, for example, make the sun shine in through a specific window. Adjusting the Angle lets you simulate the daylight at different times of the day (90 = shining straight down, 40 = mid afternoon etc.).
Note:
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Regardless of which lighting and shadows settings you decide to use, you can go into the other settings and tweak them according to your wishes before rendering the image. Follow these links to read more about the options available: Real Time Options, Render Quality, Image Dimensions, Environment, and Camera Settings.
