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Vray settings: info please
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Vray settings: info please // New Users
Post by weaveribm // May 2, 2007, 11:51pm
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weaveribm
Total Posts: 592
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I'd like to find out more about the Vray/GI settings please as I notice that GI:Environment setting appears to have no visible result (appears to have no result, on my system, it could be me) from full white to full black - and I realise that those other mysterious settings if explained simply may be less hit-and-miss for a burgeoning group of new users. New and proud, if daft as a brush :)
I understand Transparent and Soft shadows and the value of the Bounce parameters, may I list the parameters I do not understand? I've studied the Vray course but trying to crystallise things with advice from more users who may have found these settings mysterious too when starting out
Size of Lights
Which lights :)
(number of Samples seems straightforward)
GI: Environment
Nothing appears to happen 0 to 256 (greyscale lighting only needed)
(Environment Image seems straightforward)
GI/HDRI Sampling
This section is mysterious. I can understand that 'bigger is better' generally :) - but in plain English can anyone explain those settings in there please?
(HDRI I explored but isn't suitable for the work I'm doing at the moment so no need for info on it, GI though is wonderful)
Min Rate/Max Rate and Custom I understand, the Pointillistes would love it.
For the TS user who asks about Vray or not Vray nearby I would advise you to definitely get the Vray addon if you can afford it, seeing the renderer going through its paces finding the bouncing light rays is as beautiful and interesting as can be. You get to see the mind of the machine at work directly, mathematics to beautiful images as you watch - and plenty fast too... very engaging.
Thanks for any help offered and any news on the differences between the present version of Vray and the new version would be very interesting too.
Peter
http://i117.photobucket.com/albums/o63/Mington/vraysettings.jpg |
Post by Shike // May 3, 2007, 12:19am
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Shike
Total Posts: 511
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Size of light: You can't control which light, but for example, it makes point-lights behave as area lights. Softer shadows...and I think it's faster than arealights.
Environment: Make sure "Enable" is checked and test it with no other lights in the scene. It's like a skylight and you can control intensity and tint with the color button.
5721
GI settings:
Below the "Enable" you have a folddown and can choose what quality you require. Start with a low setting, then increase until you're satisfied.
But that part you already got covered. I usually choose one that gives good result and then test if I can with less GI passes, for example
MinRate -3, MaxRate -3 (since same values only does one pass).
Unfortunately I don't remember what the other stuff did, but it feels like the ...,low,medium,high...(and so on) settings are pretty good as
starting point, and then just changing the Min/MaxRate to balance speed/quality. |
Post by Shike // May 3, 2007, 12:40am
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Shike
Total Posts: 511
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Some examples.
No lights, Bright White Enviro color:
5723
No lights, Medium Blue Enviro color:
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One pointlight, softshadows (needs more samples ;) ), Medium Blue Enviro color:
5724 |
Post by parva // May 3, 2007, 1:21am
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parva
Total Posts: 822
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-> Lights
Indeed this should be accesable for each light individually but for now you have only one light paramter panel which effects "all" lights (if they do transparent or soft shadows).
-> GI Environment
Like Shike described. You can use either color "or" env. texture, not both.
->GI
I can understand that 'bigger is better' generally
mmh, no... not at all. The threshould paramter becomes more accurate or sensitive at lower values. Generally you can use the presets, low, medium etc.
Important is the sampling and interpolate sampling value. Here you have to play because it depends from scene to scene which setting is the best, finally it's a user question if you want long rendertime and max details or a median.
Btw. in v1.5 from vray for tS you get the well known, new GI engine from original vray, called Light Mapping. Similar like Photon Mapping but without some of the problems it causes, it's the most used engine in Vray in conjunction with Irradiance Mapping.
It decrease the rendertime enourmesly in comparison to Direct computation (which was used until now in vray 1.0 to generatre the Second bounces.).
Some new pros and cons also but the best will be surely the direct previous it has. Means you see the result of you picture at the very first seconds, noisy but good to judge if you want to render further or break up and change some settings.
That just btw. ;) |
Post by Bobbins // May 3, 2007, 3:06am
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Bobbins
Total Posts: 506
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Size of Lights
Which lights :)
(number of Samples seems straightforward)
As pointed out this setting is global. It's actually referring to the soft shadows only and affects point, spot and projector lights. The soft shadows are simulated by a disc of light and the size parameter refers to the radius of the disc used to calculate the soft shadows. A small size means sharper shadows, a larger size means softer shadows. In general, the larger the size then the more samples will also be needed to avoid noise and artifacts.
The GI parameters are quite nicely documented in the Artist's Guide Addendum for VRay along with examples. I'd sit down and have a good read through that - it should help make sense of them. |
Post by weaveribm // May 3, 2007, 5:23am
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weaveribm
Total Posts: 592
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Thanks all for great info!
Parva a link to your link to the Irradiance Map Viewer
http://forums1.caligari.com/truespace/showthread.php?t=917
Now you can create more GI maps from different points of your scene and merge all together with the Viewer.
You could now load this new Irradiance Map and can instantly render without the need to recalculate the GI solution - good if you want a flyby through a room or alike.
This is exactly what I am doing Parva thanks that will be very useful :)
(Size of Lights) As pointed out this setting is global. It's actually referring to the soft shadows only and affects point, spot and projector lights. The soft shadows are simulated by a disc of light
Ah got it now Bobbins cheers mate I've dug out the vray.pdf and will study up. Environment lighting didn't show up then because the action takes place in a darkish room doh! :)
softshadows (needs more samples)
Thanks for those demos Shike yes I find very noisy renders sometimes and I panic not knowing which parameter to tweak. And that render you get sometimes with psychedelic twisted shadows. Nice effect though for something. Something Gothic. Nosferatu?
For new users like me- be sure to look down the bottom of threads for the 'Similar Threads' function...
Peter
Sig standing by ready for editing. Monday let's hope <crosses fingers> |
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