I have some AA problems when rendering materials with very bright highlights. For the moment I´m rendering a car interior that has some cromed parts, and edges where a highlighted side meets a darker side of the object gets “edgy”. I have tried fixed up to 6 subdivs but it doesn´t help.
tick the sub pixel mapping in the colour mapping section. should do it
Nah, it got a bit better, but it´s not as good as it should be.
what AA method are you using. Stay away from ones use image sharpeners.
i double that!
i posted about similar issues a few times already. since a bunch of builds this IS a problem. It also causes nasty white spots in glossies that reflect HDR (either environments or bright vraylights or bright reflectionplanes.) And the only solution posted so far was clamp outut + subpixelmapping…wich is a no-go. I wanna render out full float to do propercomping, not render fullfloat and clamp things right away…
Regards,
Thorsten
Here’s an explanation of why you’re getting the problem - http://joconnell.com/view.php?category=3d&view=28 but unfortunately as thorsten mentioned it means you can’t use a full float workflow.
Unfortunately, there is no good solution for this. It’s an “either-or” situation; you can’t have both full floating-point output and nice antialiasing of highlights. If you wish to keep the floating-point values, one good solution is to blur slightly the bright areas after you’ve done the compositing - this works well, since in practice, you will get glows there, if you were to take a photograph of the scene. Also make sure you don’t use sharpening AA filters (Catmull-Rom, Mitchell-Netravali etc).
Best regards,
Vlado
wouldn t those bright spots in a photo bloom?
i suppose thats the sollution…to bloom those areas in post…
:?
I would be perfectly happy with bright highlights. But the white dots appear all over the place. And the AA on detailed Chromeparts goes completely fubar if values above 1 are reflected along the sillouttes. 
Thorsten
In that case maybe you can try using only highlights, or highlights+perfect mirror reflections?
Best regards,
Vlado
got trouble thinking straight atm as am beyond 30 hours of work right now heh. Once this deadline is met or missed ( 
) i’ll try to prepare some examples what i mean.
Thorsten
dig in dude, dig in!
Lele
i see… i think i know what u mean… i ll try nd dig smth up later tonite!
I´m testing some renderings atm where I have one black leather steering wheel on a bright white background. I was rendering with fixed 4 subdivs and thought that the edges looked to rough, so I increased subdivs to 8, and then the edges got even worse. This should be impossible…
I´m using mitchell btw.
Percydaman, what do you mean by “what AA method are you using. Stay away from ones use image sharpeners.”?
what I mean was stay from AA filters such as Catmull Rom, Cook, and to a lesser extent Mitchell.
Yeah I know, catmull is to hard. But michell use to work. I have tried Area but it didn´t fix the problem.
Well, you could always cheat it if the rendertimes aren’t that high - clamp the output and render out a few different exposures and combine them into an float image in post.
Nope, they are to high.
Well, solution that works for me - you have to render original sized pict, then two times (or smth) bigger. Then, in post, blend 'em. That’s it
We’re tired of this HDR overbrights too, but there’s nothin’ to do about, except another hour for stills and a quarter for animations.