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asmartkid

Unexpected result with Portal Lights

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I have to say now I'm completely confused about the workings of portal lights.
I've been testing some interiors renderings with Mantra, and constantly getting strange results. It seems the portal lights were the problem. I have setup and uploaded a simple scene to show how I'm configuring them and to try to understand why I'm getting the opposite results to what's expected: more noise /worse sampling with the portal lights on for exactly the same rendering settings.
Worse quality picture is with Portals on. I attach the scene file, hope you can help me, I'm sure this is a very trivial issue but I'm not seeing what's wrong and this issues is causing me extremely long render times in my working scene.
Thanks in advance!

 

portalOn.thumb.png.2ec289de876df7e4c7aeb2a0dd56866e.pngportalOff.thumb.png.6c3e6d21f4c9abb90ed919b68277babe.png

 

 

portalTest.hiplc

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Very odd - I downloaded your scene and did nothing but remove the texture from the light, because I don't have it and try to render it - with and without the portal geo on. With portal geo it's much faster and less noisy than without - Didn't change a thing.

 

What version are you using (I'm on 16.5.323).

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7 hours ago, marcosimonvfx said:

Very odd - I downloaded your scene and did nothing but remove the texture from the light, because I don't have it and try to render it - with and without the portal geo on. With portal geo it's much faster and less noisy than without - Didn't change a thing.

 

What version are you using (I'm on 16.5.323).

I'm on 17.5.391.

I forgot to mention that... when there's no environment map, the portal light seems to work as expected, as you've seen. I think it could be a bug... Have you tried using another HDRI as a map for the light?

Edited by asmartkid

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