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Emissive skydome not contributing to surface luminance


I have been experimenting with image based lighting (IBL) in UE4 4.22 for an archviz scene using physical light units/proper exposure values.

I am trying to get the skydome to contribute to the surface luminance (measured using the pixel inspector) of a white card by increasing the brightness of the skydome emissive material via a multiply node and scalar value. Use emissive for static lighting is also checked, and skylight is set to 'SLS capture scene'. Currently there is no directional light as I am trying to test only the hdri lighting.

It's important to note that I am able to affect the surface luminance of the white card using the skydome by increasing the 'skylight intensity value' - however others have commented that altering this value is physically incorrect. I would like to find a way to effect the luminance of the white card using just the material emissive parameter.

I have included images of a white card luminance measured with a skydome intensity of 50,000, one of a white card luminance measured with a skydome intensity of 1000 and a shot of the skydome material (just in case).alt text

Any help or suggestions would be much appreciated :)

Product Version: UE 4.22
m-skydome.png (314.2 kB)
whitecard-50000.png (404.4 kB)
whitecard-1000.png (614.9 kB)
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asked May 26 '19 at 12:37 AM in Rendering

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