Roof lights in the LENICALC XML format

 Roof lights can only be placed on the top floor of a building and are always aligned with the x or y axes of the world. Here is an example of two roof lights and their daylight areas:

In the XML the roof light in lower left looks like this:

<RoofLightList>
  <RoofLight id="1" type="FlatRoofLight" orient="0">
    <XOrig>1.5000000</XOrig>
    <YOrig>1.5000000</YOrig>
    <XLength>4.0000000</XLength>
    <YWidth>1.0000000</YWidth>
    <TauD65Sna>0.8500000</TauD65Sna>
    <TauD65Sa>0.5000000</TauD65Sa>
    <kObl1>0.9000000</kObl1>
    <kObl2>0.9000000</kObl2>
    <kObl3>0.8500000</kObl3>
    <hw>1.0000000</hw>
    <hg>1.0000000</hg>
    <GammaF>0.0000000</GammaF>
    <GammaW>90.0000000</GammaW>
    <hs>0.0000000</hs>
    <LumList/>
  </RoofLight>
</RoofLightList>
 

Note that LumList is an empty branch, which means no luminaires are controlled by the light from this rooflight