Transmittance value tolerance issue with Radiance Glass Material 3 component

grasshopper honeybee[+]
1

Hi
I’m inputting a value of 0.4 to the Transmittance of the radGlassMat3 component, but the result is 0.436219534254 for some reason.

I tried coercing the input to take a float type hint but that doesn’t change anything, neither does changing precision settings in the Rhino file itself.

Any ideas why this is?

Thanks

2

Search for transmittance vs transmissivity. Your input value is transmittance (0.4) but Radiance needs the transmissivity value (0.4362195…).