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Vray and bump
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Vray and bump // Archive: Tech Forum
Post by CesareViaggi // May 1, 2006, 8:03am
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CesareViaggi
Total Posts: 8
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:) Hi All,
this is the my first thread in this forum.
I'm learning tS 7.1 and Vray.
I have a doubt about the bump with the GI of Vray:
it seems to work only with the direct light while it disappears in the shdowed zones where it should be the indirect lighting.
I have done many tests, with the normal map too, but the result is always this.
Is it a mistake of mine?
Is it a bug (or a limit) of Vray?
Thanks.
:) :) :) |
Post by Asem // May 1, 2006, 8:24am
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Asem
Total Posts: 255
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I had the same problem but sadly it's a limit of vray. What I tried to do to fix the problem was use a sky light or infinite light that was set low to try and uncover those areas hidden in shadow. |
Post by parva // May 1, 2006, 8:25am
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parva
Total Posts: 822
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Yes we mentioned this in Beta Cycle too.
It's a limitation. You need a direct casting light to see a bump. I'm always not happy about the loss of bump effect.
Sometimes the effect is right (loss of bump detail in corners where just indirect light is) but sometimes it isn't.
@Asem - a skylight is a good idea but the truespace skylight isn't for Vray because it can't cast shadows. |
Post by Asem // May 1, 2006, 8:58am
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Asem
Total Posts: 255
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Yeah, but at least you can get the scene lighted without loss of bump map :D |
Post by CesareViaggi // May 1, 2006, 11:38am
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CesareViaggi
Total Posts: 8
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:( I think that it is a big limit for a GI render engine to obtain a realistic image.
I would like to say to the Caligari-team that this is not a good thing and I hope that they solve it soon. |
Post by Bobbins // May 1, 2006, 9:02pm
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Bobbins
Total Posts: 506
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Bump mapping is essentially a cheat that uses the light direction to create the effect. When you use GI the light direction is effectively from everywhere, so the bump calculations tend to cancel out. That makes it look like bump mapping isn't working unless you also have a direct source in the scene which has a definite direction - as in the example shown.
It's not some fault for Caligari (actually Chaos Group - it's their renderer) to solve, it's just a limit of the way render engines work. |
Post by xmanflash // May 2, 2006, 5:51am
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xmanflash
Total Posts: 335
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:( I think that it is a big limit for a GI render engine to obtain a realistic image.
I would like to say to the Caligari-team that this is not a good thing and I hope that they solve it soon.
Why not use Johhnys BitmaptoNormalPlane instead? http://forums1.caligari.com/truespace/showthread.php?t=730 |
Post by CesareViaggi // May 2, 2006, 7:47am
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CesareViaggi
Total Posts: 8
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Bump mapping is essentially a cheat that uses the light direction to create the effect. When you use GI the light direction is effectively from everywhere, so the bump calculations tend to cancel out. That makes it look like bump mapping isn't working unless you also have a direct source in the scene which has a definite direction - as in the example shown.
It's not some fault for Caligari (actually Chaos Group - it's their renderer) to solve, it's just a limit of the way render engines work.
I disagree:
here the same scene renderd with Carrara 5.1 pro.
(Pov-Ray can do this too).
I have bought Vray-for-tS because I think that it is an excellent engine but so it is like to have a raytracer without the possibility of activating the reflections. |
Post by Bobbins // May 2, 2006, 10:19am
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Bobbins
Total Posts: 506
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You're right in that there are programable cheats that can put the bumps back in when they wouldn't otherwise be seen. This is the same as soft shadows: VRay cannot do them for most lights but by a simple trick they are faked quite nicely for you.
If you try you will find that VRay 1.0 for tS7 can do bump maps with GI. They're just not always seen. |
Post by Vizu // May 2, 2006, 11:55am
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Vizu
Total Posts: 628
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maybe we can get some day the VRay displacement how it is in 3D Max :jumpy: |
Post by Asem // May 2, 2006, 3:30pm
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Asem
Total Posts: 255
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Is anyone having this wierd effect on there textured objects when using vray?
Those blacks spots shouldn't be there and when I use lightworks I get a better result without the black spots.
The texture is 2048 x 1536. |
Post by jamesmc // May 2, 2006, 3:44pm
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jamesmc
Total Posts: 2566
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I need that texture for a fence I'm doing! :D |
Post by GraySho // May 2, 2006, 8:22pm
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GraySho
Total Posts: 695
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Is anyone having this wierd effect on there textured objects when using vray?
Those blacks spots shouldn't be there and when I use lightworks I get a better result without the black spots.
The texture is 2048 x 1536.
Try to reduce amp of your bumpmap and/or shininess. I guess you have to adjust your textures to the render engine to get the best results. |
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