Quality of Antialiasing

[Furnace]

Hi,
I'v got some nasty jagging around edges of light reflections, I guess I need to use a different aliasing option, could anyone recommend a smoother setting please?

It's currently -
Adaptive
Min shading rate - 1
Render mask - none
Divide shading subdivs - on
Image filter - on
Filter - Area
Size 1.0

Thanks for any help.

[super gnu]

what are your min and max aa settings?

[Furnace]

Min. rate: -1
Max rate: 2
Color threshold: 0.1
Normal thresh.: Off
Dof/moblur subd: 6
Randomize samples: On
Object outline: Off

[super gnu]

ahh you are using "adaptive subdivision" aa, not "adaptive"

switch to "adaptive" and try a min/max of say 2, 6 for starters.. should clear your issue up.

[Furnace]

Hey, thanks for the reply.

It doesn't seem to be getting any better, this is my current setup, I'm adding the Area filter to try and soften the highlights, everything seems jagged...

Image Sampler
Adaptive
Min shading rate: 1
Divide shading subdivs: On
Render mask: None
Image filter: On
Filter: Area
Size: 1.8

Adaptive image sampler
Min subdivs: 4
Max subdivs: 10
Use DMC sampler thresh.: On

Global DMC
Adaptive amount: 0.85
Noise threshold: 0.005
Lock noise pattern: On
Min samples: 8

Environment
All off

Colour mapping
Type: Reinhard
Gamma: 2.2
Multiplier: 1
Burn value: 1
Sub pixel mapping: Off
Affect background: On
Linear workflow: Off
Clamp output: Off
Mode: Color mapping only

Appreciate any help.

[Subburb]

Hello ! Maybe try subpixel mapping ON ?

[Dariusz Makowski (Dadal)]

UR reflection is too bright in comparing to light. Either override reflection to be lower or use Vrays AA box 2.0. In either way its a hard one to fix. I would suggest fixing it in post by clamping 32 bit reflection pass to lower vlaue. Alternatively use DOF, Blom, etc.

[super gnu]

try playing with the max ray intensity setting. this will clamp your bright highlights without killing the dynamic range of your image.

[Deflaminis]

You using IES here? Really feels like IES specular overexposure which I seem to run into all the time. Can you post your specular and reflection channels so we can see where the noise is really coming from?

[Furnace]

Thanks for all the reply's.

Here are the reflection and specular passes.

Cheers.

[Furnace]

No IES in the scene. It's a tunnel made of 48 sections, each section has 6 VRay lights, 4 at the top are VRay Plane lights, usual options, multiplier 40, sudivs at 14, directional set to 0.7. 2 at the bottom are VRay mesh lights using a cylinder, multiplier 40, subdivs 14.

Cheers.

[svetlozar.draganov]

The Lights are probably too bright and the Image Sampler cannot blend smoothly the pixels which reflects the light and the ones that don't.
If you are using V-Ray 3.x try to decrease the Max Ray Intens value like super gnu suggested.

Reflection Subdivisions of the material should be also increased, what is their current value?

Can you attach a simplified version of the scene for investigation?

[Joelaff]

You could also try (in this order)

"Soften" image sampler filter with a radius of 4.2

Turn on sub pixel mapping (as others suggested) and set clamping in the color mapping rollout to around 3.0. This is less accurate in terms of representation of highlights, but it typically renders faster requiring less AA, and does a really good job with bright specular reflections.

Reducing the intensity of your light may help as well, as has been suggested already.

But try the soften image filter first.

Just out of curiosity, maybe try setting directionality of the lights to 0 as a test.

[Furnace]

Thanks all, clamp helped, direction 0 helped also, and I'll try the soften now.

Thanks again for advice, appreciated.

[Joelaff]

How did Soften help (radius of 3.95 or 4.2 or so)??