Question about Anti Aliasing

[sarford]

Hi guys,

I have this image here with two renders, both with the same Kray settings (everything option 'Low' with sampling option 'Medium').
In the top image all surfaces are set-up with nodes, in the lower image all surfaces are set-up with the standard LW material (except the whiskey glass and the pill bottle).

The difference in render time is 22 hours per frame. Most of that time, I'd say at least 20 hours, went to anti aliasing the top image.
I know that the new shaders are more computational intensive but I'm a bit baffled to see only the anti aliasing part of the render stage take up 90% of the time.

My question is if this is normal behaviour, and if so, what can I change to keep my render times manageable while using nodes?
With manageable I mean that anti alias times can be around 30% of total render time.

Cheers,

Simon

[jure]

Hi guys,

I have this image here with two renders, both with the same Kray settings (everything option 'Low' with sampling option 'Medium').
In the top image all surfaces are set-up with nodes, in the lower image all surfaces are set-up with the standard LW material (except the whiskey glass and the pill bottle).

The difference in render time is 22 hours per frame. Most of that time, I'd say at least 20 hours, went to anti aliasing the top image.
I know that the new shaders are more computational intensive but I'm a bit baffled to see only the anti aliasing part of the render stage take up 90% of the time.

My question is if this is normal behaviour, and if so, what can I change to keep my render times manageable while using nodes?
With manageable I mean that anti alias times can be around 30% of total render time.

Cheers,

Simon

Obviously Kray ran into some problem there. This usually happens with "exotic" nodes like some material nodes and such. Sometimes LW will pass huge values to kray which then throws off calculation and makes Kray work harder than necessary. Unfortunately the only way we can fix this is by users sending us offending scenes so we can add some kind of workaround for this behaviour.

In your case there seems to be something strange going on on TV screen since I see quite some noise there. You can try and disable those nodes first and see if that fixes the problem.

For AA i suggest you try grid 4 or 5 with FSAA.
Nice scene btw!

[Janusz Biela]

Imho use complicate Nodes is not quite good idea...only some surfaces need it (for example Dielectric which does not work correct, car paint which does not work correct, SSS .... this Nodes was prepare for Lightwave native render not for Kray....even V-ray has special internal shaders for that ) so we must wait for SSS shader in Kray, volumetric etc.
btw AA phase in render should be around 20%-40% in renders, depends from scene of course (same in V-ray, there is very good AA speed...which is realy fast....but not that much comparing to Kray)