<t>Puybaret, thank you so much. that is what I want exactly!!<br/>
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BTW, I find a bug when I try to import an object file, eg zip format of a model.<br/>
I found once I imported the object file, its I/O would be locked exclusively no mater when I closed the object importing whindow until I ...

is there any feature provided to change the position of the light source, I find it always at the position of south...