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I was wondering if it needs "DAY=1; NIGHT=1" since if you attach the effect file without that parameter, it will show both day and night already. If it is need to be seen only night, the parameter "DAY=0; NIGHT=1" is required. This parameter "DAY=1; NIGHT=1" is never meant to be used, may it cause problem during export? I don't know either. Why don't you try it just only attach the effect without any parameters and see how it is?

Try exporting without parameter (no any DAY or NIGHT). Just to check that your parameter is correct. If you can see the effect without parameter then disappear when you add parameter, so the problem should be from parameter.It was only a test purpose, just to see if it works in day and night time conditions.








1. Make a plane, or box, or whatever...this is a real piece that will show in the sim.
2.Make the poly, or whatever you will use to attach the effect...convert it to editable mesh.
3. At this point, if I'm planning on a dusk-to dawn light, I will clone the editable mesh object. So far we have 3 pieces. one object that will show in the sim, and two editable mesh objects. Let's call them Plane_01, Box_01, and Box_02. The boxes are the editable mesh.
4. Since there are two boxes occupying the same space, you may have to select the second one with the selection list. At any rate, select one of them.
5.Run the attachtool script from the FS Tools menu. Check the "Effects" box ONLY.
6. Select the proper effect to be attached, then in the parameters box, put DAY=0;NIGHT=1. Press the "attach to selected geometry" button.
7. Repeat steps 4 through 6 for the other box, but put DAWN=1;DUSK=1 in the parameters box.
8. Name the file and save it. Run the LOD Name tool to assign a guid to the object (and hence the .mdl).
9. Export the file as an FSX .MDL.