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Thread: Absolutely No Falloff Lighting

  1. #1
    Newbie Member
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    Absolutely No Falloff Lighting

    I've got a strange one -

    I need to render a scene with a low intensity light with absolutely no falloff.

    Example:

    You have two rooms, 4m x 4m x 4m connected with a 2.5m doorway. We'll call them room A and Room B.

    xxxxxxxx..xxxxxxxx
    x......x..x......x
    x......xxxx......x
    x...A........B...x
    x......xxxx......x
    x......x..x......x
    xxxxxxxx..xxxxxxxx

    You have one light centered in room A (2m off the floor, 2m from all walls)
    The light is set to 10% white with no falloff.

    What I want is for all four walls, the floor and ceiling of room A to be illuminated 10%. Also, the wall in room B directly opposite the door should be illumunated 10%. (in the bottom example, the @ show walls illuminated)


    @@@@@@@@..xxxxxxxx
    @[email protected]
    @[email protected]@@@......x
    @[email protected]
    @[email protected]@@@......x
    @[email protected]
    @@@@@@@@..xxxxxxxx


    I can't figure out how to render with absolutly no falloff.

    Setting Falloff to Off still shows the light dimming with distance.
    Setting the Falloff to Linear with a hugh value creates a very bright light even if the color is set to 1% white.

    Any hints or tricks?

    -Skacey

  2. #2
    obfuscated SDK hacker Lightwolf's Avatar
    Join Date
    Feb 2003
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    What you might see there is not a falloff, but the face that the light returned from a surface (which is the perceived brightness) depends on the viewing angle as well as the angle of incidence (and on the shading model).

    As a simple solution... why not add 10% luminosity to the surfaces (maybe controlled by a weight map) ?

    Can you post a sample (scene, renders)?

    Cheers,
    Mike

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