I need to model a source pattern shift on a mesh grid( when light source is tilted by some angle theta)

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Sagar Saxena 2018-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/381604-i-need-to-model-a-source-pattern-shift-on-a-mesh-grid-when-light-source-is-tilted-by-some-angle-the

编辑： Sagar Saxena 2018-2-8

Situation: when light rays falls vertically (i.e zero degree tilt) , lets say the pattern formed on a grid is at location (x,y). Now, i tilt the light source so now rays fall at an angle of 20 degres, so the orignal source pattern on the grid will shift to new location (x',y').

I need to model this in terms of equations. Is there any equation or concepts that deal with modelling shifts in terms of incedent angle.

Any Insight is highly appreciated!!