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[TUT] Mipmap fix


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Hi there, this tutorial is about fixing the textures with alpha map like grass or leaves from getting darker with growing distance.

The problem is that dark colors that are usually masked by the alpha start bleeding in the visible parts of the texture.

That might be hard to understand but i guess the images speak for them self.



This is how we like our texture:



But with the distance the engine will fade over to a lower resolouted image:



You can see how dark pixels have appeared on the outer edge of the grass. That is causing the problem and yes this is not a custom texture these are from Bethesda.

So how are we going to fix this?


First we load up the texture in gimp



This is how the texture looks without alpha



we want the invisible part to have a color that is as close as possible to the visible part.

So we copy the layer and apply some blur to the lower layer.



Then we select only the opacity layer


(sorry for the german, I'm sure you'll find it anyway)


And then we fill the whole layer, the color does not matter, since we only fill the alpha



Then we create a selection from the top (original) layer alpha



We merge the two layers and create a layer mask from the selection



(continued in comments)

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Then we apply the mask and everything looks like it did when we started, but its not.

If you create a selection from the green channel it should look like this



so the color channels are different. And if you save your texture and generate mipmaps you should find something like this



a way better looking mipmap with the same colors as the higher resoluted image.


sorry for the ammount of immages, but i thought the more images the better to understand.

Edited by clara3ME
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