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Lost ability to use image props for sky reflections in windows? - VB-148280


Christiaan

Question

We've previously been able to create environmental/sky reflections in the windows of our elevation drawings by using an Image Props behind the Section Line of a Section Viewport.

 

We seem to have lost this ability at some point between now and the middle of last year. Image props are no longer reflected in the windows. I'm assuming it's a bug because I can't make it work and nor can Stephan Mönninghoff.

 

But I'd I wanted to check if anybody else had some ideas on solving this or using another method.

 

Test file attached:  test-file.vwx 2.zip

 

1.thumb.jpg.cbb16bb19a72366ad4b1177dfb3567e8.jpg

 

2.thumb.jpg.58a400ee3e3c26a5fdf0a7c395ac8d34.jpg

 

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1st, you may already know,

there is a setting in Viewports if hidden geometry will be shown in Reflections or not.

 

2nd, very unlikely,

but I had problems in C4D R19, that Reflections were not shown at all (!)

for my (simple non IOR Arch-) Glass - until I activated some Refraction.

 

And that R19 CineEngine should found its way into VW with VW 2019.

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5 minutes ago, zoomer said:

1st, you may already know,

there is a setting in Viewports if hidden geometry will be shown in Reflections or not.

 

Yes, I think you're talking about the "Cast Shadows of Objects Removed by Section" aren't you? I have that checked (but this little nuance did stump me last year when I started using this method).

 

5 minutes ago, zoomer said:

2nd, very unlikely,

but I had problems in C4D R19, that Reflections were not shown at all (!)

for my (simple non IOR Arch-) Glass - until I activated some Refraction.

 

And that R19 CineEngine should found its way into VW with VW 2019.

 

I like your thinking. Am I "activating" refraction by using these settings? If so it's already active:

 

740554848_ScreenShot2018-09-28at14_52_17.thumb.png.e8d23638493ee14b60d046f5b86a8c2c.png

Edited by Christiaan
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1. Yes, that setting.

 

2. Refraction active :

You don't need (time consuming) blurryness.

Transmission is ok if you want to slightly darken the glass.

Important to activate Refraction is that you set "Index of Refraction" (IOR)

to a value grater than 1,0 (Vacuum), like 1,517 for a typical Building Glass.

 

 

For standard flat + parallel Window Glass Panels, in reality there will be some

IOR Refraction and Ray bending of course. But you will not notice that in a

Rendering that the Ray behind the panel may have jumped 2-3 mm parallel

to the original direction (opposed to a curvy Object like a Bottle).

Therefor in ARchViz you often use a fake simple Arch Glass without Refraction,

to save some Render Time.

Edited by zoomer
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12 hours ago, Christiaan said:

I need to come up with some other solution for my deadline on Monday then.

 

You can use a separate special VW Background for Material Reflections.

Like from an image that looks similar to your Things in front of your Section.

(You could just render your Image Props for that)

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12 hours ago, Christiaan said:

I need to come up with some other solution for my deadline on Monday then

 

Appears to work in 2017 Christiaan. The small area you've provided as a test gives subtle clouds that I would assume will fill the whole elevation as you were expecting. Its certainly making a difference.

 

Testfile 2

745361323_ScreenShot2018-09-29at10_31_07.thumb.png.99995d1fb6b4df443c4b44e4fa6bf27b.png

 

Opened in 2017

 

595955860_ScreenShot2018-09-29at10_31_22.thumb.png.0b9abcb1cce39692b7977c41b39be9c6.png

 

Assuming you are only after visuals for Monday, maybe this will work?

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