Sheer Curtains

sheer curtains - everytime I try to make a material translucent in SketchUp, it has a glass-like appearance when rendered with IRender nXt.

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Permalink Reply by Render Plus on January 26, 2012 at 4:42pm

We probably need you to create a small model and image we can look at.

Here I created a translucent cylinder, with a yellow light inside of it. If you look hard you can see the light itself.

The cylinder has there material settings:

Transoarency: 0.70

Refraction: 1.00

Translucency: 0.50

Does it have the glass like effect you describe?

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Permalink Reply by Jorge Lopez on January 27, 2012 at 7:55pm

Al,

I'm sorry to have bothered you. I tried to reproduce the problem and as you can see by the attachment - I am getting the effect I want. I think I was remembering the problem with another rendering program. Thanks again for your time.

Attachments:

hotel-interior-city.jpg, 56 KB

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Permalink Reply by Render Plus on January 27, 2012 at 8:04pm

Great - always great to hear when something works right and Rich and I don't have to try to fix it.

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Permalink Reply by Render Plus on January 28, 2012 at 12:30pm

After I played around with the SketchUp file, I noticed I got the shiny effect when using all the defaults settings and rendering in high dynamic. I don't get this effect when rendering with sun. I've pasted jpgs below.

I would like to send you the Sketchp file but do not know how to do it in this manner. Could trying to send it using the reply be causing my problem? The file is only 2.38 MB

The SketchUp file does not have any IRender lights. I modified it further for the previous replies. Instead it was used with another rendering package (previous to getting Render nXt). Could that renderer be causing some conflict with your rendering engine?

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Permalink Reply by Render Plus on January 28, 2012 at 12:33pm

Use the Uploads menu above to send the .SKP file, or email it to support@renderplus.com.

I can't tell by looking at the JPEG's which is right or which is wrong, or what the problem is. You may need to be more specific.

Our Rendering package does pick up some Kerkythea settings and some Podium settings. But without the model, and without knowing what to look for it is hard to guess what might be wrong.

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Permalink Reply by Jorge Lopez on January 28, 2012 at 3:39pm

Here are the two images again with some additional text.

I sent you the SketchUp file per your email response. I'm slowly getting better with this Forum stuff...

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Permalink Reply by Render Plus on January 29, 2012 at 7:35am

Thank you for sending the .SKP file.

The only setting on the curtains - material: curtain1 - was transparency in SketchUp.

The default rendering settings for transparent materials is to treat them as thin, reflective glass - so that the rendering of the curtains was very much like the rendering of the windows. We make windows reflective because windows are reflective, and because it makes exterior scenes more realistic because there is often reflection of the sky in the windows.

If you right click on the sheer curtain, and select "IRender nXt/Create Material" then you can override the settings for Curtain1.

Here are the default settings it gets - because it is transparent:

(Note reflection intensity on the Main tab is 1.00 - set it to 0.00, and the Index of refraction on the Trans tab is 1.50, set it to 1.00)

Here is a rendering with the default settings - having the glass like reflection you noticed:

Here is a rendering with reflection set to 0.00 and Refraction set to 1.0:

Next, I went to the Trans tab and set Translucency to 1.00. This has the effect of making the curtain like a lamp shade - it lets light through - but objects behind the curtain are not specifically visible. This would be more effective if the scene was being illuminated more by light coming from the scene behind the window - rather than the sunlight coming from behind the camera because of your other transparent walls.

Also, you can lower the effect of the translucency by setting ti to values less than 1.00 to achieve a partial translucency.