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Problem with a transparent material

7 ANTWORTEN 7
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Nachricht 1 von 8
Anonymous
1790 Aufrufe, 7 Antworten

Problem with a transparent material

I have an issue with a transparent material and I can't find any similar questions online. 

 

I am trying to make a diagrammatic rendering showing a long row of electrical racks. I want the racks to be red and mostly transparent. The problem is when I line them up in rows, after the light travels through approx. 6 planes of material, the material suddenly renders as opaque. I would like it to gradually go opaque as the light travels through more and more surfaces, and I can't seem to find a way to fix the material after a lot of experimentation. Attached images are of the phenomenon, of my render settings, and the last is the image when I simply turn the graphic display options to "realistic". Turning the view to realistic seems to show the material as i want it. Anyway to make the actual rendering look this way?

 

Thanks!!

 

Annotation 2020-05-15 191727.jpgAnnotation 2020-05-15 190801.jpgAnnotation 2020-05-15 191823.jpg

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Nachricht 2 von 8
barthbradley
als Antwort auf: Anonymous


@Anonymous wrote:

after the light travels through approx. 6 planes of material, the material suddenly renders as opaque.

 

 




https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Revit-Customize/files/GUID-FE11BBF0-830B-4AFA-B639-D8617008BB3E-htm.html

Nachricht 3 von 8
ToanDN
als Antwort auf: Anonymous

Try the Highest rendering quality to increase the number of transparent layers you can see through.
Nachricht 4 von 8
Anonymous
als Antwort auf: barthbradley

Yes I also found this while googling the problem, however this page does not specify anything about maximum planes of transparent material or anything similar...

Nachricht 5 von 8
barthbradley
als Antwort auf: Anonymous

Try a different Asset. Maybe red-colored Air? :zwinkerndes_Gesicht: 

Nachricht 6 von 8
Anonymous
als Antwort auf: barthbradley

I tried the air asset and a couple others and the problem remained. However, I also tried upping the render quality and that seems to have worked. Per the screen shot there is no longer any "transparency cutoff". Its unfortunate that i have to use high quality, as the render times are significantly longer and I was hoping to do a series of these renders, but c'est le vie. 

 

 

However there is some sort of moire-ish pattern that I'm not sure where its coming from. Any ideas how to get rid of that? (I tried rendering at Best quality and its still there).

 

render 5 high.jpg

Nachricht 7 von 8
barthbradley
als Antwort auf: Anonymous

Looks like a Radial Gradient to me, but you wouldn't be able there with Air Asset. Are you using an the actual "Air" Asset found in the Asset Library?  Which version of Revit? 

 

Air.png

 

Also, what is the thickness of the geometry using this material?  

Nachricht 8 von 8
Anonymous
als Antwort auf: barthbradley

The render with the grain-iness is not with the air asset. You are correct in that the air asset did not have the gradient, however when I used the air asset I was not able to get the nice layered transparency look that you have in your render. Per the attached, I get a sort of look of a homogeneous color, no matter how many planes the viewer is looking through (the racks are modeled as individual masses with 1" space between them, per the second screen shot). I have played with the penetration distance as well and that does not seem to alter it. 

 

I'm editing to add that for the grainy picture, there is no gradient on the material, as its just a generic asset material with a transparency applied. In fact, it seems like the center of that gradient exactly matches the viewpoint of the camera, so I'm wondering if this is some sort of artifact of that. I can't really think what else would cause that.

high.jpgAnnotation 2020-05-20 161056.jpg

 

 

grainy render:

Annotation 2020-05-20 163240.jpg

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