topic Re: Multiple Transparency, False Light in Visualization

Multiple Transparency, False Light

Lingwisyer — Thu, 11 May 2023 09:53:35 GMT

Hi all,

I appear to be getting false illumination when rendering through multiple panes of glass into a shaded space... Render settings are the default Outdoor Daylight Fast settings with the Ray Threshold increased to 10.

Ling.

Re: Multiple Transparency, False Light

Daniel Kovacs — Mon, 01 Oct 2018 13:12:21 GMT

Hi,

I am not sure I understand what is happening in this picture exactly, but maybe what you see is just the reflection of what is behind the camera?

If you have problems with the light going through multiple panes of glass, I suggest you to read the corresponding section of this article (there is more to it than just Ray Threshold):
https://helpcenter.graphisoft.com/knowledgebase/41188/

If that doesn't help, can you send in a bigger/clearer picture, so that I can see what the problem might be exactly? (maybe compare it to what you see in OpenGL).

Thanks, Daniel

Re: Multiple Transparency, False Light

Lingwisyer — Tue, 02 Oct 2018 02:58:06 GMT

That is a door and the containing wall inside the room viewed through a balustrade and a window. On a view that looks over the balustrade, the interior is essentially black due to the lack of interior illumination.

A different location using the default "Outdoor Daylight Fast (Physyical)" settings.

Ling.

Re: Multiple Transparency, False Light

Belinda Ercan — Tue, 02 Oct 2018 08:45:03 GMT

Hi there,

Ray threshold should be decreased and Ray Depth should be increased.
This is the relevant HelpCenter article:
https://helpcenter.graphisoft.com/knowledgebase/41188/

The relevant section is: CineRender and glass surfaces

Re: Multiple Transparency, False Light

Lingwisyer — Wed, 03 Oct 2018 01:53:17 GMT

Ray Depth is 10, enough for 3 layers of glass. Lowering the Ray Threshold does not change the result.

Ling.

Re: Multiple Transparency, False Light

Daniel Kovacs — Thu, 04 Oct 2018 07:14:26 GMT

Lingwisyer wrote:
Ray Depth is 10, enough for 3 layers of glass. Lowering the Ray Threshold does not change the result.

Hi,

That might not be enough. I just did a quick test here, and actually lowering ray threshold did more for me. Try setting the Ray Threshold to 1% and the Ray Depth to 30. If that doesn't solve your problem, it is possible that it's a limitation of the rendering engine, or there's something else in the way. In this case please send me the project in a Private message (in a PLA format), so that I can investigate it further!

Thanks,