How to make rainbow ends fade out

Question

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

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. — htdewitt, May 02 '15 at 00:35
can you post your result , or even upload the file so we can work on it ? — Chebhou, May 02 '15 at 00:41
I don't want to appear to be stupid but how do I upload my file? — htdewitt, May 02 '15 at 01:04
no problem , see this help page then copy and past the link in your question — Chebhou, May 02 '15 at 01:07
FANTASTIC!! SWEET !! AWESOME !! This is what I was looking for! You are a genius my man a pure genius!!! — htdewitt, May 02 '15 at 02:42

score 4 · Answer 1 · answered May 02 '15 at 02:25

4

One way to fix this is by placing the UVmap inside the texture space bounds :

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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

answered May 02 '15 at 02:25

Chebhou

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How to make rainbow ends fade out

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