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ramp base on a light


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how can i use a ramp base on a light?


i am trying to get something similar to the HIP file, (that is using vops and a camera), but how can achieve something like that in the shader? with out having to carry all the attributes in the points,  i am asuming should be something like ramp projected from an object?


or i have to import the attributes in the shader?




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