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1. UDK - Material - Texture Defined Specular

   

   Topic by Ace-Angel · Dec 2011 · Home› Unreal Engine

   Hey to all, been reading on this: http://udn.epicgames.com/Three/TextureDefinedSpecularReflection.html#Settings Which is cool, but I get this instead: I tried everything that comes to mind, from putting up a hacked in Transform node, to keep the Blue channel as an additive from the RG, and none of them seem to work. Much…

2. Re: UDK - Material - Texture Defined Specular

   

   Reply by Ace-Angel · Dec 2011 · Home› Unreal Engine

   ambershee: The defined Spec is the standard one found from UDK, which looks like a rectangle, I didn't use anything else. However, since you mentioned, I went back to look, and it seems like if I use another one Texture (again, from UDK) which is more rounded and looks a Phong highlight, it doesn't mess up at the seams.…

3. Re: UDK - Material - Texture Defined Specular

   

   Reply by Ace-Angel · Dec 2011 · Home› Unreal Engine

   Hey Vailias, thanks for the help, this is awesome, much appreciated and sorry for keeping you awake. I tried taking a run for it, but it seems like as usual, I did it wrong, here is what I got: EDIT: Oops, just noticed you weren't done with it, sorry for the bum-rush :poly136:

4. Re: UDK - Material - Texture Defined Specular

   

   Reply by JordanW · Dec 2011 · Home› Unreal Engine

   Sorry, have a lot of Real-Life goin on lately so i'm not on forums much :) Vaillias: Yes, it's basically placing a blurred image in the direction of the light and instead of doing a pow on it, it does some contrast enhancing/clipping. It's been a long time since i looked at that material, maybe the seam issue can be…

5. Re: UDK - Material - Texture Defined Specular

   

   Reply by Vailias · Dec 2011 · Home› Unreal Engine

   Damn you and your interesting problems! I need to sleep some time! :P I'm on to something Very early test to see if my thoughts held any water. They DO and I'll see if I can make this work later on. The short of it is this: Transform the object's normals into Light space(in this example they're in view space since that's a…

6. Re: UDK - Material - Texture Defined Specular

   

   Reply by Vailias · Dec 2011 · Home› Unreal Engine

   Lol no it's not a solution. It would error at the seams severely. Hence my questioning. It's what I did to make the moon texture follow the dominant light in that other thread.

7. Re: UDK - Material - Texture Defined Specular

   

   Reply by JordanW · Dec 2011 · Home› Unreal Engine

   I've only used this technique a few times and I'm the one who made it :X Maybe check your UVs? I know since a lot of this technique is tangent space hackery it could easily get messed up with UV seams/distortion.

8. Re: UDK - Material - Texture Defined Specular

   

   Reply by ambershee · Dec 2011 · Home› Unreal Engine

   What does your specular texture look like?

9. Re: UDK - Material - Texture Defined Specular

   

   Reply by LoTekK · Dec 2011 · Home› Unreal Engine

   Do your UV islands overlap there, maybe? I'm wondering if it's at all related to this odd issue: http://udn.epicgames.com/Three/ContentBlog.html#Fixing%20specular%20highlights%20when%20using%20X%20and%20Y%20symmetrical%20texture%20mirroring

10. Re: UDK - Material - Texture Defined Specular

    

    Reply by Vailias · Dec 2011 · Home› Unreal Engine

    no worries. The transform will be the biggest thing to set up. It will need a custom node since its going to need a mul(vector, matrix) operation that isn't exposed as a UDK node. I'll need to revew how to do that exactly.. been a while since I was messing with matrices.