Blending HDRI and Sky?
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Also, they are resolving a lot of the HDRI issues in the next release with a Sky Dome feature. Thank God. I hate that every time I buy an HDRI I have to open it in PS and blur it so it works. Pain in the backside.
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Yea - I've not been able to get a result of Blend today.
And I'm really looking forward to the Skydome.
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I take that back about the environment background slot... doesn't actually work the way I thought. To get the blend right you have to adjust two variables:
GI multiplier for the HDRI
sun intensity for the texskyJust like in Fernando's tutorial
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@valerostudio said:
Fernando has a trick for this. Basically use the HDRI in your Envir and BG slots. Then put the TexSky in your Reflect Color, uncheck it to turn it off (Vray still remembers the Texsky settings), then under Global switches have Default Lights checked, this uses the sun settings that are hidden under Reflect Color to cast the shadows. Voila!
Golden!!!
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hmm.... if you use a plain colour for GI you can also easily tint the general environment while have full control over your sky shadow.
I made the sky size 20 so I got quite soft shadows - like on a partially clouded sky which my BG HDRI display. And then I lowered the intensity and now the shadow areas aren't so dark. Perfect!
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Well, the issue is with reflections. I went back to the original model I was testing, and it was an issue of reflections, not lighting levels. If your background is too bright or too dark, you won't see the reflection of your environment map, or you might see too much. The blend helps control reflections only. Hope that is of some use.
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I'm not seeing any problems with reflections. It appears to me that I see just the BG HDRI...
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OK. I was just explaining the reason behind my alternative approach. YMMV
the illumination levels still depend on the sun intensity setting and HDRI multiplier either way. -
I guess it might depend on the Sky and HDRI settings - in my current setup it seems to work ok.
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It all comes down to workflow and what you are trying to achieve. I use Fernando's method and wait patiently for Sky Dome!
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hi everyone
I chose a picture for BG in vray option window
does anybody knows how i can reduce the size of image and make it repeat in the back ground? -
Hello,
in the Texture Editor of BG settings, if you use a TexBitmap, in the UVWGenEnvironment, you've got a "repeat" option for horizontal and vertical settings.
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@chon said:
in the Texture Editor "repeat" option
yes but it is not working for me:
it is a reflect able sphere I rendered for you to see
I attached original picture and rendered pictures with 1, 5 ,20 and 100 repeat both in horizontal and vertical directions.
as you see when repeat number increases it seams picture goes to be zoomed more and more in the background!
why I can not see at least one picture in complete size in the background? while I want to see pictures tiled in the background!
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Perhaps try a repeat of 0.25 (this should give you 4 images across the 360 degree view)
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Using background images, VRay maps an image on the interior faces of a sphere representing the sky with your scene in the middle of that sphere.
So, on your image, you've got to represent both north AND south hemispheres with the horizon on the middle of that image like that :
Hope it will help you...
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@andybot said:
try a repeat of 0.25
this is a 0.25 repeat... as you can see it is still one picture in the background!
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@chon said:
So, on your image, you've got to represent both north AND south hemispheres with the horizon on the middle of that image
i understood what you said...
but why i should do that? I mean what happens if don't do that?
and how it helps me too have a tile texture in the background? -
@ali64risk said:
this is a 0.25 repeat... as you can see it is still one picture in the background!
I guess that's slightly less bad
Maybe it's time to look for a different environment image - there's just not enough sky in that one... -
@chon said:
in the UVWGenEnvironment, you've got a "repeat" option for horizontal and vertical settings.
When you set UVWGenEnvironment, is it also set to Spherical? I've always wished that there was a graphic representation of the environment map in the scene that I could manipulate. I always end up using an image in the reflect and refract and then add same image as a background in Photoshop.
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ali64risk,
take a look on that VIDEO. It will help you for configuration.
Try to render your scene with my sky image. You will have a bad BG render because of low resolution but you will understand how it works.
To have good results, your HDR image must have a very high resolution.
On this exemple, the HDR image is 9000 pixels long and is a pure render, no photoshop postprod :
On the net, high HDR images sold are 12000 pixels long...
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