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Rico Hofmann avatar image
Rico Hofmann asked ·

Emission in standard surface

Sometimes I have to use the emission in set standard shader to light a part of the scene. Then it males no difference to set the emission to 100 to to 1000. It's not getting brighter. Is there something limiting the emission of the standard shader on higher values?

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Stephen Blair avatar image
Stephen Blair answered ·

The UI control is disabled, so you get the default of 10

if you want a different value, enable the UI and change the avlue.

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Thank you. This hint is very helpful.

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Stephen Blair avatar image
Stephen Blair answered ·

User options workaround:


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Rico Hofmann avatar image
Rico Hofmann answered ·

Here I set the emission to 100 an the sample clamp to 1 and 100. There is no difference in brightness.


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There's a bug in the plugin and the indirect clamp is not exported properly now. It's gonna be fixed in a next release.

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As a workaround you can set the indirect_sample_clamp as a user option in the render settings:

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Rico Hofmann avatar image
Rico Hofmann answered ·

I did some tests and I changed the indirect sample clamp. But the brightness of the emission does not change.

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Rico Hofmann avatar image
Rico Hofmann answered ·

Is this the setting for clamping diffuse samples? By default it's switched off. Or is there another setting?


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Stephen Blair answered ·

The surface itself should be getting "brighter"
The pixel values on the surface will be way over 1,1,1


Other objects in the scene use diffuse (indirect) sampling to get a contribution from the emissive surface, and that is clamped to 10 by default.


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Rico Hofmann answered ·

Can someone help? Maybe I don’t have explaind my problem well.

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