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#ActualFrenetic Pony

Posted 31 May 2013 - 06:11 PM

Point emitters are just a theoretical non physical thing. It's just used because hey, it looks good and close enough to physical that who cares right? There is no real world analogue to an infinitely small point light of course, quantization as photons blah blah blah. It's a useful hack and that's that. And importantly its the fastest useful hack you can do, at least for getting close. And it should still be energy preserving, after all the closer you are the the infinitely small point source the smaller the area being affected. At zero, the point source, you've infinite energy and zero area to fall on so congratulations!

 

I guess if you really wanted to, and why wouldn't you? You'd use the blogs thing and estimate the actual area of the light source for everything. The area being the coil inside the lightbulb, or maybe the area of the reflector on a flashlight if you want to get all that light in there. I.E. choose your convenient light diffuser/reflector. More accurate light falloff for real cheap, sounds good to me; even if most light sources we actually have are extremely small (which is why point light sources work so well as an analogue) there's still other things that will reflect them in a static fashion/diffuse the light to the point that an area light source such as the blog's would be more correct.


#2Frenetic Pony

Posted 31 May 2013 - 06:08 PM

Point emitters are just a theoretical non physical thing. It's just used because hey, it looks good and close enough to physical that who cares right? There is no real world analogue to an infinitely small point light of course, quantization as photons blah blah blah. It's a useful hack and that's that. And importantly its the fastest useful hack you can do, at least for getting close.

 

I guess if you really wanted to, and why wouldn't you? You'd use the blogs thing and estimate the actual area of the light source for everything. The area being the coil inside the lightbulb, or maybe the area of the reflector on a flashlight if you want to get all that light in there. I.E. choose your convenient light diffuser/reflector. More accurate light falloff for real cheap, sounds good to me.


#1Frenetic Pony

Posted 31 May 2013 - 01:56 PM

Point emitters are just a theoretical non physical thing. It's just used because hey, it looks good and close enough to physical that who cares right? There is no real world analogue to an infinitely small point light of course, quantization as photons blah blah blah. It's a useful hack and that's that. And importantly its the fastest useful hack you can do.

 

I guess if you really wanted to, and why wouldn't you? You'd use the blogs thing and estimate the actual area of the light source for everything. The area being the coil inside the lightbulb, or maybe the area of the reflector on a flashlight if you want to get all that light in there. I.E. choose your convenient light diffuser/reflector. More accurate light falloff for real cheap, sounds good to me.


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