Small bright reflective highlight aliasing issues.

[GidPDX]

I'm having trouble with aliasing on a thin bit of reflective highlight. All other sampling seems fairly good, but for this thin highlight I just can't shake the alias jaggies.

I've tried upping the shading rate, max divs, and lowering the threshold but that didn't help. Setting the global clamp to a low number (like 1) didn't even help. What are some other places I should look to try and take care of this? I feel like I'm overlooking something obvious.

The image shows a render in Vray and one in MODO. They look different for a few reasons, but I've highlighted the problem area which is that long thin highlight. Even with the vray sampling cranked up and taking out all the other noise these aliasing jaggies still stick around vs. in MODO with low settings.

[John_Do]

Did you try to use the AA filter ? A simple blur with 2px box filter for example.

[vladimir.nedev]

I don't think upping the shading rate can help you for this, it will only slow down the rendering probably.

John is right that you can play with the AA filter type and size to reduce the jaggies.

I think that the recommended way to deal with these kind of jaggies is to enable bloom from the Lens Effects windows.
This will soften the image.

Clamping the color from the color mapping settings didn't work, because it is done on the pixel level, not sample level.
You can enable sub-pixel mapping from the Channels view-port, then clamping will do what you want.
But this is not a recommended workflow.

Greetings,
Vladimir Nedev

[boyan]

Edit : Ignore my post as the solution has not affect antialiasing.

Hey GidPDX,

Thank you for the post. Can you try as double an "Adaptive min Sample" by default is 16, make it 32 samples. Also, check the attached file.

BR Boyan

[GidPDX]

Hey GidPDX,

Thank you for the post. Can you try as double an "Adaptive min Sample" by default is 16, make it 32 samples. Also, check the attached file.

Thanks Boyan for the suggestions. I've tried upping them already but will try again at those levels.

I actually don't see an attached file or link. Or did you mean for me to send you a version of the scene?

Did you try to use the AA filter ? A simple blur with 2px box filter for example.

This is already with Gaussian at 2. I tried 2.5 and it wasn't much better.

I think that the recommended way to deal with these kind of jaggies is to enable bloom from the Lens Effects windows.
This will soften the image.

Clamping the color from the color mapping settings didn't work, because it is done on the pixel level, not sample level.
You can enable sub-pixel mapping from the Channels view-port, then clamping will do what you want.
But this is not a recommended workflow.

Greetings,
Vladimir Nedev

OK, I'll give the lens effect a try. Maybe at a very small level it will do what I want. I'll look into sub pixel mapping if the other suggestions don't help.

[vladimir.nedev]

Thanks Boyan for the suggestions. I've tried upping them already but will try again at those levels.

The Adaptive Min Samples shouldn't be modified, as the default value is tested to work best, they won't help you in this case either.

Greetings,
Vladimir Nedev