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As I had much fun with this (thx Chebhou) but gaussian functions are a bit too complex for me, i want my volume scatter cylinder to have simply a smaller cylinder emitting light inside it, from the same object/material. The same size all along, or why not being able to control the fading at one or both sides (why not asking :) )

It has to be done with math nodes, vectors and things like that (what I want to learn)

Something like this but in a single object enter image description here

looks like a light saber :)

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  • $\begingroup$ related: blender.stackexchange.com/a/15711/1853 and blender.stackexchange.com/a/3640/1853 $\endgroup$
    – user1853
    Feb 13, 2015 at 17:11
  • $\begingroup$ @cegaton nope, i don't want a compositing or modeling answer, it has to be shader maths. I already did (long ago) a light saber but i want to learn more about math nodes and vectors in materials. I hope this is simple enough for me to understand the why and how. $\endgroup$
    – Bithur
    Feb 13, 2015 at 17:16

2 Answers 2

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use this circle equation and chose a radius "max R = 0.5" :

enter image description here

Coordinates node group : enter image description here

and for fading on the sides i used a sin function :

enter image description here

render : enter image description here

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    $\begingroup$ seems like what i wanted, checking details :) $\endgroup$
    – Bithur
    Feb 13, 2015 at 17:28
  • $\begingroup$ the sin doesn't seem to fade the light, it just stops at both ends. $\endgroup$
    – Bithur
    Feb 13, 2015 at 18:19
  • $\begingroup$ it fades but in short range that it's not clearly visible because that's how a sin wave is, you can replace with other functions $\endgroup$
    – Chebhou
    Feb 13, 2015 at 18:26
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    $\begingroup$ Max R=0.5 :) A max value of 1 would be for diameter. $\endgroup$
    – Bithur
    Feb 15, 2015 at 12:54
  • $\begingroup$ yeah, you are right $\endgroup$
    – Chebhou
    Feb 15, 2015 at 13:23
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Variation on Chebhou's answer : Origin and dimension independant :
enter image description here

Not sure the sine works exactly the same.

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  • $\begingroup$ that's brilliant ! it is dimension ,and origin dependent $\endgroup$
    – Chebhou
    Feb 15, 2015 at 16:26

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