Does anybody know how to create a Chroma Key Material for a Green Screen?
Or is there anywhere already a Material / Shader for free download?
Thank you so much for any little help,
appreciate it!
This what you’re looking for?
yes. Unfortunately, I can’t follow that tutorial.
I tried. But I was not able to understand the proper steps.
This tutorial might be good for very technical guys and coders - but I am more a visual person and I can’t follow and understand what he is doing.
Is there no way to find from Epic or someone else a Video-Tutorial that shows exactly how to setup that material?
Or maybe a Demo Scene file I could download to see how the material and the nodes have been used and connected?
Thank you very much!
Ok try this thread where a bunch of guy from 2015 were testing it out someone even made a video about it at the bottom of the thread.
Chroma Key thread: https://answers.unrealengine.com/que…-material.html
Video on how to build material: Unreal Engine 4 Misc - #01 Chroma Material 1/2 UE4 Video Player - YouTube
Video part2: Unreal Engine 4 Misc - #02 Chroma Material 2/2 UE4 Custom Material - YouTube
Those two video tutorials are the ones I tried before and failed. For some reason, it didn’t work. I followed step by step and created the exact same nodes to replicate that material. Unfortunately, it didn’t work. Not sure if it has something to do with 4.23. But no matter what I tried. Nope. Can’t seem to create a chroma key material that works. 
Unreal engine already have an awsome BP node, open the material editor and look for use that node on emissive color and opacity socket and open it via material instance and watch the magic works.
here are some screenshots of my attempt:
@**shanoubar thanks for the tip. I tried using the ** in the material editor then reference it from its instance, my result didn’t come out as yours. I’ve been on this for two days now but couldn’t breakthrough. Would you mind sharing the process step by step or better still share the project files so I can go through? Thanks
I was also stuck on this for a while, expects to receive the chroma color as a parameter, so I think that the best bet would be to change the parameter default in the material editor to match your green screen. I believe that the image from is incorrect, the inputUV I think is only for the garbage matte, and should be a float2, not a float3.