That’s a complicated question. Let’s see:
- White papers and the like will regularly describe rendering methods, but the IP associated with such papers may or may not be clear. I can’t give you legal advice about it, but it may be best to reach out to the author where there’s not clarity. The source of the method (blog, paper, conference) is less important than the license grant related to the underlying IP.
- If you own the rights to code, there is a way to contribute code to Unreal if that’s what you’re asking (through GitHub).
- If you own rights to code, there is a way to sell it on the Marketplace.
Not being your lawyer, I can’t give you legal advice on what content is not subject to IP or can be re-used through fair use. I can say that the best bet is to get permission.