Bad AA

[Numse]

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.

[unknown]

tick the sub pixel mapping in the colour mapping section. should do it

[Numse]

Nah, it got a bit better, but it´s not as good as it should be.

[percydaman]

what AA method are you using. Stay away from ones use image sharpeners.

[ene.xis]

what AA method are you using. Stay away from ones use image sharpeners.

i double that!

[instinct]

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

[joconnell]

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.

[vlado]

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...

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

[ene.xis]

wouldn t those bright spots in a photo bloom?

i suppose thats the sollution...to bloom those areas in post...

[instinct]

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

[vlado]

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

[instinct]

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

[studioDIM]

dig in dude, dig in!

Lele

[ene.xis]

I would be perfectly happy with bright highlights. But the white dots appear all over the place.

i see... i think i know what u mean... i ll try nd dig smth up later tonite!

[Numse]

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."?