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Is there any way to know the number of light rays falling to a specific region from a source?
Is there any parameter available in Cycles to increase the number of light rays?
Is it possible to visualize Cycles ray paths in the 3D Viewport?

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Is there any way to know the number of light rays falling to a specific region from a source?

Pixel brightness depends on the strength and number of rays hitting it. So if you calculate the brightness coming from a single ray, and divide the resulting brightness by that value, you should get the number of rays. Problem is, how to calculate the brightness of a single ray, maybe you can estimate it, or hit the surface once (how? samples=1 and looking only for the bright spots a.k.a. 'fireflies'). Also what if various types (strengths) of rays hit the surface? Maybe you want to isolate each light in a separate render…

Your question is missing a very important aspect: why do you need this? Smells like XY Problem from a mile away.

Also, please ask one question per post (so I answered just the first one).

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  • $\begingroup$ Thank you for the answer. I am trying to build a pinhole camera with pinhole size in micrometer range. But i am unable to obtain image, since not enough light rays are passing through the pinhole. Hence I want to know the number of light rays falling on the pinhole region and is there any way to increase the number of light rays. $\endgroup$
    – Vidya
    Aug 18 at 9:48
  • $\begingroup$ @Vidya maybe you want to investigate portals? $\endgroup$
    – Markus von Broady
    Aug 18 at 9:56
  • $\begingroup$ I tried with portals also. It doesn't make much difference in my setup. $\endgroup$
    – Vidya
    Aug 18 at 10:04

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