sky rendering

[dagobert]

did indigo generate a realistic sky when using sun and sky setting. or just a black background. i m using blender and don t know if i need to edit something to get something like in maxwell.

[Kram1032]

"physical sky and sun" simulates a physical background, just like maxwell's, with one difference: Maxwell's sky is mirrored, where as indigo's fades to a greyish colour, after the horizon.
Besides that option, you also need to add a sunlamp, which then points in the direction, your sun shows. all the other types of lamps will get ignored.