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Best Way to Make a Sun
show user profile  herfst1
Hey, I have my scene nicely setup, sample rate is mostly blue and aqua... then I turn on my sun and this is what happens:

And my intensity is low, so I'm not going crazy with the settings.

I was using a vraySun, size 1.0, turbidity 2.0, ozone 0.8, intensity 0.1, shadow subdiv 3, shadow bias 0.4 (I believe). Also the sun was positioned very far away and the visibility turned on.

I can post my other settings, but there's not too much point (as far as I understand) since they are all pretty much perfectly optimised without that bloody sun.

So... does anyone know a better solution to get the exact same result but not kill my sample rate?

P.S. I have an hdri in a vrayDome quite dark, GI, and I have vrayEnvironmentFog so it's quite misty.
read 899 times
4/7/2015 11:39:00 PM (last edit: 4/7/2015 11:40:54 PM)
show user profile  Garp
I believe there's no decay with vray sun, so the distance doesn't matter. Try an intensity of something like 0.001.
(ps: I haven't used vray in ages, so I might be totally off the mark)

edit: also make sure the vray sky is hooked properly.

read 881 times
4/8/2015 12:15:43 AM (last edit: 4/8/2015 12:19:00 AM)
show user profile  herfst1
Yes, with a very low intensity it makes the sample rate bluer, but then it's losing it's hard shadows and hard spec.

Good to know about the distance thing, I thought the ozone would have some play in softening/blueing up the light.

[edit] yes, I always use instances with the environment map and dome light (using vrayHDRI)... assuming that's what you meant by "hooking properly."

[edit #2] sorry, forgot to say thanks for the reply.
read 875 times
4/8/2015 12:30:27 AM (last edit: 4/8/2015 12:32:55 AM)
show user profile  Garp
I was talking about the VraySky thing. I don't remember which way it goes between vray sky and vray sun but you have to tell one that you're using the other to get a correct solution.

> but then it's losing it's hard shadows and hard spec
Do you mean that they're less intense or that they are now blurry (the latter shouldn't happen).

read 870 times
4/8/2015 12:38:15 AM (last edit: 4/8/2015 12:42:59 AM)
show user profile  herfst1
Oh yeah, when you add the sun it asks to add a vray sky map or something, I say no and keep the hdri I already set up... but having said all that I'm going to do some tests right now.

The shadows are less intense purely because the rest of the scene is less lit up. I'll do some test renders and show comparisons while I'm doing these tests.
read 859 times
4/8/2015 12:58:55 AM (last edit: 4/8/2015 12:58:55 AM)
show user profile  Bolteon
why are you bothering with your sample rate?

-Marko Mandaric

read 837 times
4/8/2015 5:09:31 AM (last edit: 4/8/2015 5:09:31 AM)
show user profile  herfst1
Because I'm very concerned about not burning my shit little laptop... and very concerned about getting it rendered a quickly as possible.

Incidentally, I'm also considering a render farm. Though I'd need some tips on, firstly, saving my file so that the map paths are linked (i.e. don't need to repath if opened on another computer) and, secondly, saving out the camera tracks so they automatically switch when rendering (I remember the video bus was a bit iffy).

P.S. Fell asleep before, will do those tests, Garp.
read 819 times
4/8/2015 9:36:23 AM (last edit: 4/8/2015 10:13:00 AM)
show user profile  herfst1
So rendering out at 320x480, only doing a quarter region select... and the times are ridiculous.

read 807 times
4/8/2015 10:58:33 AM (last edit: 4/8/2015 10:58:33 AM)
show user profile  BishBashRoss
My advice is to leave all the Sun settings at default, use the physical sky and then use the physical camera to expose the scene properly.

Then when you are happy swap the sky for the HDRI and adjust the HDRI multiplier to get it to the same rough brightness as the physical sky.

read 805 times
4/8/2015 11:07:49 AM (last edit: 4/8/2015 11:07:49 AM)
show user profile  herfst1
Okay, great. I'll give that a go. Cheers, BBR.
read 803 times
4/8/2015 11:09:08 AM (last edit: 4/8/2015 11:09:08 AM)
show user profile  reeves1984
Despite your settings being perfectly optimised perhaps you should share them as vray varies a lot depending on the route you go down, such as using aa at something like 1/50 which then divides all the other samples

Simon Reeves - VFX Artist & Blog
twitter <-- I work here

read 796 times
4/8/2015 11:15:39 AM (last edit: 4/8/2015 11:15:39 AM)
show user profile  herfst1
I hate it when I put my foot in my mouth. It is "Perfectly optimised" only regarding sample rate and un-noisy shadows, reflections and refractions. Thing is this is an animation and 99% of it is indoors, so the sun and fog and all that will be turned off after about 200 frames.

Looking at my settings the DMC could be notched up a bit, aa could be VrayLacroz (never know which one to use tbh), and light cache is a bit of a mystery to me, I have my settings low but there are no splodges, so I left them at that... anyway, enough covering my ass, here are the settings:

read 794 times
4/8/2015 11:32:37 AM (last edit: 4/8/2015 11:32:37 AM)
show user profile  ijzerman
Why is your noise treshold so low?
Why not try setting it to 0.01 and when a material gets noisy up the subdivs?

Pushing buttons since "86
read 788 times
4/8/2015 11:45:32 AM (last edit: 4/8/2015 11:45:32 AM)
show user profile  herfst1
Thanks for the tip.

P.S. For all these settings queries e.g. "Why didn't you do that?" the answer is always, "Because I'm no rendering expert."
read 785 times
4/8/2015 11:49:06 AM (last edit: 4/8/2015 11:49:06 AM)
show user profile  Nik Clark
How on earth do you get anything done in Vray with so many settings?!

I much prefer the simplicity of Corona/Cycles/iRay.

Click here to send me an emailClick here to visit my websiteClick here to visit my photo gallery on Flickr

read 781 times
4/8/2015 11:53:09 AM (last edit: 4/8/2015 11:53:09 AM)
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