View Full Version : rendering: jagged edges

04 April 2004, 02:29 PM
Hi there,

I've got a rendering problem with maya. I'm rendering for broadcast, using 50 fps, and interlacing in after effects. This is to counter the effects of jittering lines when rendering in fields. Even so the overall looks is good, but I'm still having problems with small elements in my renders. They'res still a jagged effect. (see image)

This is only part of a frame rendered at 1024x614 (never mind the strange resolution)
In the image I see the small lines turning into jagged edges...
It may seem like a small detail, but it looks really bad when previewed on a monitor.
Any suggestions, are more then welcome...

04 April 2004, 03:34 PM
have you turned up your anti aliasing, or is that a texture on the model? and if so what is the textures resolution?


04 April 2004, 03:49 PM
AA is set at "highest quality" "box-filter 2.5", and it's not a texture its all poly's you see, but when I replace them with a texture of about 2048x2048, there's still the same effect.

04 April 2004, 04:57 PM
I'm assuming you're using the maya renderer, have you tried turning the shading samples up on that one object that's causing the problems?

04 April 2004, 05:29 PM
the suitable of filterS : guass 2.0 2.0
box 1 1
triangle 2 2
if the number is too high.....u image will
become more blur.........

anti lias ... jitter will make u image more pleasing to eye

04 April 2004, 06:10 PM
Originally posted by Elrod
This is to counter the effects of jittering lines when rendering in fields.

I guess nobody is rendering to fields these days. I'd render regular frames then add the fields in afterfx.
Try to post another rendering without fields.
Hope this helps.

04 April 2004, 12:17 AM
I'm not sure what purpose rendering to fields will serve. I do a lot of work for TV (NTSC) I just render everything at 30 fps and then composite in AFX and remove the interlacing from the video image. Have you tried just outputting at the standard PAL frame rate and checking it there? Are you also checking a final rendered and uncompressed AFX composition on you external monitor? Are all of your fields set properly odd or even?


04 April 2004, 05:43 PM
I had the same problem latelly Maya really has an issue with Anti-Aliasing.

Specialy when you have a tight deadline

04 April 2004, 02:22 PM
I'll try that when I'm back at work

The image is non-field

I've rendered the sequence at 50 fps, but the jagies are still there

This was for a tight deadline at my new job, and they weren't pleased

Thanx everyone for your reply, I'll keep you posted as more deadlines come my way..

04 April 2004, 02:27 PM
I've tried rendering in Mental Ray, and this is the result.
The lines work fine, but in the back, they break up...
This really s*cks.....

04 April 2004, 04:12 PM
Something I've done in the past to avoid this is render out at a higher resolution, then downsize it later. I ended up having to do that a lot with fur, that stuff aliases like crazy.

04 April 2004, 06:24 PM
Either turn up the min samples or turn down the sampling contrast threshold (that's what decides whether to use the min or max samples). These settings are there for both Maya and MR.

It depends on the scene, but the contrast setting will usually have less of an impact on render times.

04 April 2004, 10:10 AM
Well Finally got rid of the jaggies, and rendering crisp clear sharp images (see attachment), just the way I wanted. So I've rendered a sequence, at 0.5 framestep, imported into After Effects at 50 fps. Rendered a Quicktime (upperfields first, animation compression) and ported it to the Avid. Result: Crappy jagged edges again. I've tried all settings in from stretching the sequence to frame blending, but it keeps being crap......
I'm getting frustrated here..
Any comments are welcome.

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