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Vray tips&tricks
About Truespace Archives
These pages are a copy of the official truespace forums prior to their removal somewhere around 2011.
They are retained here for archive purposes only.
Vray tips&tricks // Roundtable
Post by parva // Jun 13, 2006, 10:44pm
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parva
Total Posts: 822
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I would like to create a thread where the users can share hints about working with Vray 4 trueSpace.
Like known Vray 4 trueSpace isn't Vray for Max but it's nevertheless worth to watch threads in the Chaos Group (http://www.chaosgroup.com/forum/phpBB2/) forum at least as long some specs are the same.
And there trueSpace Vray will get some really special features and advancements in the future it's a place to share help.
The first little hint works even with Vray 4 tS and comes originally from Dmitry Vinnik
(original link (http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=15386) from Chaos Group Forum.)
Here what he says:
... I would like to explain what is affect shadows and why it is there, and how else light can pass through the glass, and what are the physical properties of that:
Affect shadows is a "fake" or a "cheat" to allow fast renderings of light which has passed through glass. However its physicly incorrect. The reason for this is, every light energy that has passed through glass has become a caustic energy.
Therefore you need caustics for the light to show from outside in interriors. For this the refractive caustics must be turned on, however because of often used biased method such as irradience map, caustics will never show, thus the illumination from passed light through glass will not appear, producing result shown in example 3 below.
So, to see the light we eather turn on affect shadows, which is imo a good cheat for a fast and effective rendering time, or we turn off affect shadows, turn on refractive caustics and set illumination method to qmc/lc with very high sampling, or lc/lc in ppt mode and wait for many hours for the light to show.
Here are some research tests I've done for maxwell forum, but they also apply to this:...
I made the same test with trueSpace Vray and even here the ground logic behind works.
From speed point it depends how many photons you use. I used 2000 and it tooks a bit longer as the version with Transparent shadows on.
With 800 photons the Caustic version was much faster.
It's often worth to spend the time in Caustic calculation (which is still very fast), without the need of Transparent Shadow, to get more speed in the Irradiance calculation process.
With Transparent Shadows on you will get a noticeable speed decrease during IR calculation.
Indeed it depends like all settings from the used materials and scene setting.
But finally, if you want realism, deactivate transparent shadows and turn Caustics on :)
Btw. this works just outdoor best with HDRI. Like Dmitry said it didn't work well (indoor) with Irradiance Mapping. To lighten a room with "lightrays passes glass windows" is realistic but needs much much higher GI settings and results in a worse rendertime, and isn't a real alternative to the method described in the Vray Course.
http://www.parva-project.de/stuff/ts/beta/tshad.jpg |
Post by Bobbins // Jun 14, 2006, 11:49am
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Bobbins
Total Posts: 506
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OK, Here's one from my scrap book about VRay for tS7.....
Textures/Image Maps:
At 'Medium' render quality setting: Textures are used directly as seen in the Player view so textures are downsampled. (Note that in the Model view there is a setting for 'Txt res for Player' in the Display Preferences - this is on pages 98 and 929 of the Artists Guide).
At 'High' render quality: The original texture file from disc is used at full resolution. This requires the original image file to still be present in it's original location on disc - no renaming or moving of the file otherwise the downsampled image from Player view will be used as above. |
Post by parva // Jul 1, 2006, 6:37am
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parva
Total Posts: 822
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From Chaos Group comes a program called "Irradiance Map Viewer" (http://www.spot3d.com/vray/misc/imapviewer.rar).
You can inspect and merge several Irradiance Maps together.
So you can build a large but detailed IRMap which stores all GI information, for example from a room.
You must rename your GI Solution to the extension *.vrmap so that the Viewer can read it and you will get something like that:
http://www.parva-project.de/stuff/ts/beta/imapv.jpg
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.
http://www.parva-project.de/stuff/ts/beta/croom.jpg
here (http://www.parva-project.de/stuff/ts/croom.zip) the Sample Scene. |
Post by daybe // Jul 1, 2006, 7:55am
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daybe
Total Posts: 562
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Thanks for the link parva, this will come in very handy.
Cheers, |
Post by b_scotty // Jul 2, 2006, 2:28pm
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b_scotty
Total Posts: 176
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Yes, this looks very interesting! Thanks! |
Post by Johny // Jul 5, 2006, 5:39am
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Johny
Total Posts: 672
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Thanks for the link Parva :banana: |
Post by simpo // Sep 6, 2008, 9:07pm
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simpo
Total Posts: 25
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Can Vray for Truespace work with other programs such as Blender? |
Post by splinters // Sep 6, 2008, 11:03pm
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splinters
Total Posts: 4148
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No, it is a propietary plug-in built using the Vray SDK for the tS code.
Nor can you use the standard Vray (well, not until someone writes a plug-in!) |
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