Getting light intensity falling on object

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On 25/01/2012 at 04:14, xxxxxxxx wrote:

Hi all

just curious

I've managed to get some simple ray casting examples working from bits and bobs on the net
but I can't make the leap to the next stage below

Request

Has anyone an example of how to get the intensity of light falling on an object?
(from a specific light)

tia

Paul