How can I make underwater god rays. Unity does have a sun shaft script but the water blocks it also it only makes beams from objects. What I want is something like this : - YouTube
You can always do these things manually for maximum control using additive shaders!
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Make a plane or a cylinder with no caps
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Make a ray texture by painting straight white rays that fade out at the lower end on a black background
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Put the texture on your plane or cap-less cylinder using an additive shader, you can find one in the particle shader section! This only makes the bright parts of the texture visible.
-Animate the plane/cylinder itself or some uv scrolling on the material and you have sunrays!
What about using billboard particles with stretch.?
There is as system on the asset store that does what you want I think