I think that is physically correct and works just fine, but it´s not really enought. I have no idea as to why do I need those last slots but well, for the moment it´s working, so that´s fine. This material will be set to unlit and you will use a “TextureSampleParameterCube” to insert your hdr texture there and a “reflection vector” with a “constant 3 vector” attached so it won´t give you an error. Get a huge sphere and drop a material into it.Right to this moment what I got is this for hdri lighting on UE: That said, I almost became crazy trying to understand the hdri lighting, which is **** easy to set up in whichever engine you are used to (me that´d be corona, vray at first). I love it but I realized it is indeed a game engine, and as obvious as that might sound, I also realized that may be important to try and learn the engine natural way of doing stuff, rather than taking our regular archviz workflow on other engines and trying to reproduce it on UE. I spent the last week or so diving into unreal so I am still quite new to it.
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