Bouncelights effect with Gradients

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  10 October 2004
Bouncelights effect with Gradients

Several people have asked me about the technique to make in LW this image created originally by Twilight in VRay:

The render time at 640 x 480 are 7min 46 seg and at 800 x 600 are 9min 42 seg.
The GI effect in this scene is achieved mainly with gradients based on distance of Null objects:

to explain it better I've prepared a simple scene:

The room shown above, don't have any light (Light intensity = 0 / Ambient Intensity = 0), only 4 Nulls to adjust the bouncelight effect of basic ambient light, more 2 lights is possible to obtain a result a little more accurate:

In both cases I've used the same technique: Gradients based on distance of Null objects; this can be made with LW gradients or with FIsLocal Ambient shader.
This tutorial will only explain how to use this technique with LW gradients.

Before anything we should have clear how the light behaves in the nature or to guide us by photographs or a preliminary render with GI.

We begin loading our room and diminishing the Light intensity and the Ambient Intensity at 0; what we have now is a dark room.
Either that we use spinning lights, FPrime or SG_AmbOcc shader, is advisable to separate in independent Layers the floor, the ceiling and the walls.
We change the Backdrop Color to white, we go to surface panel and adjust all the surfaces with Luminosity to 80% aprox:

Last edited by gerardo : 08 August 2005 at 10:28 AM.
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