and i found a ue4 forums post about a radial blur post effect here
unfortunately i wasnt even able to change the code of the second link to work on a texture sample - so complete rewriting of the gaussian blur is a thing i simply not able to do.
So maybe somebody allready did it yet? - Box blur would be fine too, i guess, because it doesnt have to be absolutely accurate.
By using temporal AA to offset the steps you can get a decent result with surprisingly few steps. Ie a 4 distance steps with 2 radial steps doesn’t look so bad with the TempAA setting tweaked just right.
thank you Samaritan for that hint - allready tweeked the box blur to give a decent Result - if somebody is interesed:
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UV);
dist = dist / r;
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for (int i = 0; i < r; i++)
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blur +=
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dist*i));
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}
blur /=
((r*r*4)+1);
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Thanks RyanB - that looks amazing, especially cause i might need frosted glass too but most important for me would be bluring cubemaps, which does not work with my actual code, listed above
@RyanB - i managed to get your temporalAA Code work in Texture2d (TextureObject) - wich gives nice results - but how would i do that with cubemaps then? There are no functions to sample them in custom nodes, are there?
It would have to be re-written a bit in order to work as a cubemap. Currently the math takes an angle and creates a vector based on it, but to do that for a starting 3d vector requires using math like rotate about axis, or possibly a random number generator that respects unit length normals.
There may be an alternate way to do it actually. i made a function that can be used to sample a cubemap using regular UVs. You would need to reimport the texture as a non-cubemap but it can still be an HDR image. Then we can try performing the blur on it by first converting the cameravector from Longlat to UV. I need to dig around to find that function. I’ll post back later.
sounds good, thanks for your help - but i fear it have to be a regular cubemap in order to accept scenecapturecube targets
what i want to do, is capturing a small cubemap and then blur it just a little bit to use it 4 highlights in different materials, thats why i want to blur it by shader, so each material can have its unique glossness
- Box blur would be fine too, i guess, because it doesnt have to be absolutely accurate.
but most important for me would be bluring cubemaps, which does not work with my actual code, listed above