Light Problems in scene.

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I'm very new to this forum and a bit decrepit, so I apologise if I do anything wrong.

I've created a simple room building scene. But there's a strange problem with the lighting. As you can see in the image below with no light added to the scene or with a light inside the box everything is okay. If I add any kind of light outside the box to the scene (point, direct, skylight etc) light stops entering the box and the scene is rendered incorrectly.

Thanks very much if you can help, Gray
Edited by Jerry Hat - Nov. 3, 2019 17:03:47

Attachments:
houdiniproblem001.png (272.9 KB)
roomtest.hipnc (495.0 KB)

- blog: http://www.jerryhat.com [www.jerryhat.com] - usually features Houdini these days
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see attached,
no light attenuation, use shaders.

Attachments:
roomtest_newshaders.hipnc (722.7 KB)

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cpb
see attached,
no light attenuation, use shaders.

Just wanted to respond quickly to thank you.

I've had a look and I understand more or less what's going on but will no doubt have some questions later.

again thanks, Gray
- blog: http://www.jerryhat.com [www.jerryhat.com] - usually features Houdini these days
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