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Re: Tutorial - Gradient Mapping & UDK
You would just question me on just enough to get me to write it wouldn't you? :P Thanks for the push. It took far longer than I'd thought all because it took me a while to remember/figure out the general form for making these sub gradations, but the mental math felt good. I finally had to break out the paper and work out… -
Re: Tutorial - Gradient Mapping & UDK
The only issue with procedurally gradient mapping in udk atm is the number of lerps you'd wind up putting in for more than a single color change. if you want a 2 color "gradient node" just make 2 color constants and lerp between them with the alpha being whatever your were gradienting over. You could do it in a custom node… -
Re: Tutorial - Gradient Mapping & UDK
You'll want to have a small buffer range between each gradient, though, to account for compression artifacts. My only issue with that is the relative lack of flexibility in the gradient maps themselves (you'll need a different set of gradient textures per color set, unless you start playing with stacked sets of gradient… -
Re: Tutorial - Gradient Mapping & UDK
Hey man, I thought I'd help you out a bit with a sorting function so you don't have to stick those color nodes in a particular order. Just the alpha values set up properly. float3 output; //output colorconst uint NUMCOLORS = 4; //number of colors for programatic gradientfloat4 gradient[NUMCOLORS]; //here's the actual… -
Re: Tutorial - Gradient Mapping & UDK
This is effing fatnastic, Raz you sexy beast! Just tried it out and it works like a charm. This could be really useful on the tileable/organic stuff. Too bad it doesn't eliminate a diffuse texture lookup, even though it's small. You could make a gradient procedurally jumping through some hoops in UDK, but if epic made a… -
Re: Tutorial - Gradient Mapping & UDK
Vailias: That's interesting, but what would you say the benefit to this procedural method is? EDIT: As a start to a proper gradient node it's cool - you'd need an interface though! :) -
Re: Tutorial - Gradient Mapping & UDK
Hey, Vailias, this is totally awesome. A lot better than messing around with all the lerp and uv nodes. And thanks for the comments - made the thing more transparent for the unfamiliar with HLSL. I learned a thing or two about it thanks to you. The color parametrization is also useful to just quickly create a bunch of… -
Re: Tutorial - Gradient Mapping & UDK
Great stuff, guys! And ofcourse you make some great points as for what a true gradient node could do - in my mind though, it would need to offer unlimited colors on the gradient to compete with Photoshop for doing certain things, but to be sure, this is great work and a big step on the way. D1ver, I don't know how you do… -
Re: Tutorial - Gradient Mapping & UDK
:) Just had to play around some more with this and check out how it could work for a post process shader. This one uses a desaturated scene sample with a bit of green boost in the desat, plus the "uber post process effect" inline after it for things like bloom, grain, and dof. All these come from the same code I had… -
Re: Tutorial - Gradient Mapping & UDK
D1ver: Thanks. I was about to write in commentary that the ordering issue could be solved with a simple bubble sort like you did. I didn't put it in though as the whole of that HLSL block gets evaluated for EVERY PIXEL of the material at EVERY draw call its visible. On a simple thing like this it doesn't add that much…
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