just to illustrate things.

As BB mentioned, the difference between a full inverse sqaure attenuation (1/d^2) and the correct formula (for a real bulb with radius R) I derived in an earlier post {1- 1/sqrt(1+R^2/d^2)} is noticeable in the first say 3 lightbulb-radii only. Here is the graph, one with a linear scale, one with a log scale.

As you can see one should avoid placing the bulb near an object with 1 radius, which - in real life - is impossible anyway as the bulb sets a lightsource at such a distance in the first place.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though