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Windows Render Black when Image is Used in Background

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Anonymous
1878 Aufrufe, 5 Antworten

Windows Render Black when Image is Used in Background

Hello,

 

When doing a basic rendering, if I use the Revit "Sky: Very Few Clouds" setting my windows reflect fine.  If I change the background to an Image of a sky, then my windows black-out.  My Glass reflectivity on these is 60+, and I haven't changed the rendering settings at all between one image and the other.  Any suggestions???

 

Thanks,

-Jon

 

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JasonKunkel
als Antwort auf: Anonymous

I haven't tested this, but when Revit is using an image as the background, is it literally just a background... like a giant billboard behind your model?  If so, then there is nothing "in front" of the model to reflect.

 

Seems like a very sad workaround would be to make a huge billboard with your sky image attached, put it "behind" the camera an render...


Jason Kunkel
Senior Practice Manager, Architecture and Engineering
CADD Microsystems Blog
RVIT Blog | Twitter | LinkedIn
Nachricht 3 von 6
Anonymous
als Antwort auf: JasonKunkel

Hi Jason, thanks for your response.  I am happy (albeit a little embarrassed for Revit?) to report back that your solution does in fact work.  It does however add a very tricky problem into the mix:  the location of the sun relative to this billboard.  It really limits what time of day one can shoot a perspective -- basically the sun has to have an altitude higher than 45 degrees.  Also the billboards get massive -- for the perspective I showed I needed two billboards about 5000' x 800' to catch all the windows in the project.

 

Anyway, thank you for your help!

-Jon

 

Nachricht 4 von 6
ToanDN
als Antwort auf: Anonymous

That is actually realistic if you think about it in real life.
Nachricht 5 von 6
Anonymous
als Antwort auf: ToanDN

Agreed Toan!  Although I would have imagined Revit to follow suit from other rendering platforms and establish a place where one can select a custom "atmosphere" other than just the standard "partly cloudly, mostly cloudy" options.  If "Background Image" was a 3D dome around the project instead of a flat piece of paper behind the rendering then the problem would be solved.

 

Thanks for your feedback!

-Jon

 

Nachricht 6 von 6
ToanDN
als Antwort auf: Anonymous

You can replace the OOTB EXR files with custom light probe images.  Make sure the images can map a hemisphere properly.  You can even convert HDR and any other image format to EXR via this online conversion tool.  Make a backup of the OOTB Presets folder before changing anything.

 

Below is a test.   I just picked a random free EXR on the internet so obviously it mapped all wrong.  

 

Capture.PNG

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