Sub-pixel ON-OFF : phisical INCORRECT, noise and rendertime

[cecofuli]

Hi Vlado,

again =) my question/problem about Sub-pixel parameter. The images talk for me. The two images are identical. Just turn OFF-ON sub-pixel.
As you can see, with Sub-pixel OFF is much better and natural , but the rendering time sooo big and the noise so much.
I try many different settings: I'm not able to remove the noise in these images, with Universal Setting and low noise threshold. Or with the old school with high AA, high QMC, high subdivs and noise near to 0.003
Nothing! And, as you can see with Sub-pixel OFF, the image is so flat and the ceiling lamp look like turn off. But inside I have 3 bright VRaySphere lights. How is it possible!
Really, I'm trouble to render this image with Sub-pixel ON, with no noise and rendering time acceptable.

I've no noise with universal setting with noise 0.07, but rendering time, with one PC at 1920px gives me >45 hours
And I don't want to talk you when the buckets are on the glass lamps....

[vlado]

And again, I have nothing new to say in that regard. Since we don't have adaptive multibounce sampling yet, you will have to find other ways to remove the sources of the noise. This may include, for example, using the VRayOverrideMtl material to make your materials simpler for GI, limiting the number of reflection/refraction bounces, disabling reflection/refraction GI caustics (if they are enabled) etc.

Best regards,
Vlado

[cecofuli]

I'm trying with this setting:

• LWF

• Rehinard 1|0.2|2.2

• sub-pixel and Clamp OFF

• Affect background ON

• Don't affect colors (adaptation only) OFF

• Linear workflow OFF

• AA 1 50

• QMC 100

• all reflection subdivs 100

• all refraction subdivs 8

• 0.85 | 0.01 | 8 | 1

Noise is muuuch less, but not acceptable in production. The bad new is that 800x600, with 4 esacore @ 3.9Ghz = 2h00min...
When the buckets are on the lamps take hours to render...

Sorry for the unfinished render... =)

[cecofuli]

The big, big problem is on the glass lamps, where the buckets take ages. Also near reflective objects. But Vlado, clear We will wait. Thank you.

[vlado]

The progressive rendering in V-Ray 3.0 will also help somewhat in that regard; right now you have to wait for all buckets to complete in order to have an image that you can show - but in progressive mode, even if the glass objects aren't quite done yet, you still have an image to show.

Best regards,
Vlaod

[cecofuli]

I reduced the three VRaylights inside the lamps from 140 to 10. The sampling now is much better and the rendering time too.
But it's always high from my point of view with 4 PC.

[vlado]

Heh ok Good point.

Best regards,
Vlado

[cecofuli]

Very good features!
About my scene. I reduced from 10 to 5 the lights intensity... The rendering time a little bit better.
How do you see the rendering sampling?

[Morbid Angel]

buy 10 Titans...

[cecofuli]

Wow... I had not thought XD ehhh...

[Morbid Angel]

I must have time-traveled again....sorry! Btw have you tried rendering your scenes with vray RT Cpu...?

[cecofuli]

Ehh me too! Yes Morbid.. better with QMC+LC.
Here just another test. (ugly). but 1h30 min with 4 Esacore is too much! See how much noise.
Don't look the left wall. There is a super-tiny specular map. In the floor too much bump, I know.
But ee the ceiling Just a little bump noise, but nothing to extreme. a lot of noise.
And also in the other objects. DOF in camera.
Also the jagged edges AA near a bright areas

• LWF

• Rehinard 1|0.2|2.2

• sub-pixel and Clamp OFF

• Affect background ON

• Don't affect colors (adaptation only) OFF

• Linear workflow OFF

• AA 1 50

• QMC 100

• all reflection subdivs 100

• all refraction subdivs 8

• 0.85 | 0.01 | 8 | 1

[vlado]

Btw have you tried making the glass elements invisible to GI? It seems to me that some of the noise comes from light being refracted through the tiny crystals.

Best regards,
Vlado

[alexyork]

Also a prime candidate for splitting the render into passes - one with and one without the glass elements, so you can individually control render settings for speed and quality.

[Morbid Angel]

cecofuli have you ever tried maxwell for your interiors or another renderer in general? just curious how others deal with such complex interiors?