If you have a transmittance value and wish to know the corresponding transmissivity value, click on Calculate Transmissivity. Enter the transmittance value in the dialogue and then click OK. The RGB transmissivity values will be updated accordingly.
If the Derive from Visible light normal transmittance (Tvis) box is checked, RGB transmissivity values will be calculated from the construction’s visible light normal transmittance and will not be editable. The visible light normal transmittance can be adjusted if required.
