[Gate-users] parallel beam?

[Sarah Blind]

Dear Gate users, 

Here is what, initially, I would like to code in Gate: my world contains a box with water and some nanoparticles. I want my source to be of the same size as one side of my box and I want it to irradiate the full box. I draw here the source in yellow : 


In fact, I want the yellow source to be a parallel beam. Does someone know how I can do that ? 

Many thanks for your help! 

Sarah Blind 
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