Substance Designer afterthought

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I finished going through the basics of Substance designer tutorial. I think I more or less grabbed the concept of how to work with the software but I'm thinking of using Substance Designer to make initial textures like some noise and then use UE4 to complete the whole material. I could use the Substance plugin and its a great plugin but I prefer not to use an external plugin. I want to try and use UE4 in its normal form and I don't want to get issues later on. It's now onto making the textures for the environment. First, I need to make some Sand and rocks texture. So I will be focusing on that.

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