Question-and-Answer Resource for the Building Energy Modeling Community
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You can try approximating it by increasing the front and back side slat beam and diffuse solar reflectance in the WindowMaterial:Blind input object.
Another option is to use WindowMaterial:ComplexShade which does have a slat curve field. That is part of the Constuction:ComplexFenestrationState series of objects. These objects have many inputs but some additional flexiblity.
