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I would like to model on non sequential mode an image reflected on a surface and study its shape and brightness from many angles. How could I do this? 
You can do that in the non-sequential mode indeed.


Set up a source to shine on an object.


Set up the scattering properties of this object. 


Add a detector to record the data and launch a raytrace.





Here is what it looks like in the sample file ''ABg scattering surface.zmx'' attached when you open a shaded model:








You can then change the angle of your source and run a raytrace again to analyse the pattern for different angles.





Here is an article describing the different scattering models in Zemax OpticStudio: https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01415


Finally, here is an article which shows how to add the surface properties to objects: https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01353


 

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