how do you make a neon transparent reddish-orange & yellow-lime?
like lego has?
Create a emission material with the color you want to have, mix it - if needed - with a transparend shader. Change the material index of the “neon glow” material and render your scene with material index. In compositing add a glow effect to the material ID of your “neon glow” material.
You can also follow this tutorial (other setup, but works too): https://www.youtube.com/watch?v=fWcCkQ3943Y&feature=youtu.be&t=5m29s
This answer is very short - if you get stuck, reply…
A good technique I have found of simulating neon type plastic materials without it being emissive is to overdrive the colours above 1 (don’t go crazy though as you’ll end up with some weird effects)
I used this technique to good effect on my retro-reflective tape material which can be found on blendswap.
In the screenshot below I used a mix of translucent and glass - overdriving the colours on the translucent to give the colour a neon type look (the RGB values for the orange and green materials are 2.0, 1.5, 0 and 1.0, 2.0, 1.0). I also gave the glass shader a slight tint towards the colour you are aiming for (i.e. a very light orange or a very light green). This seems to further enhance the effect.
I find it works best on green and orange - but you should be able to adapt this technique to make transparent neon plastic of any colour.
