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I needed to add a rainbow to a scene and found the info below that I used and made an awesome rainbow with just a few tweaks. The problem is that real rainbows usually fade out on the ends, the rainbow I make is from an extruded circle, and when I delete half of the circle the end is sharp and I can't find a way to fade out the ends of the rainbow. Is it possible?

Harold

BA thread How-to-improve-this-rainbow

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  • $\begingroup$ the solution is their in the thread in Kaluura post $\endgroup$ – Chebhou May 1 '15 at 22:55
  • $\begingroup$ Thanks for the response, I use his node set up and the inner and outer edges fade but not the ends, I have tried separating the end faces and adding another gradient and mapping node but that didnt work. $\endgroup$ – htdewitt May 2 '15 at 0:35
  • $\begingroup$ can you post your result , or even upload the file so we can work on it ? $\endgroup$ – Chebhou May 2 '15 at 0:41
  • $\begingroup$ I don't want to appear to be stupid but how do I upload my file? $\endgroup$ – htdewitt May 2 '15 at 1:04
  • $\begingroup$ no problem , see this help page then copy and past the link in your question $\endgroup$ – Chebhou May 2 '15 at 1:07
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One way to fix this is by placing the UVmap inside the texture space bounds :

enter image description here

then you can use the UV output directly in the ColorRamp input:

enter image description here

and here is the render :

enter image description here

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