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Screen comes up black in material, probably basic fix

hi I just want to know what’s wrong with this material thing, im making a pixel post procssing thing but it comes up black in the editor and in gameplay. I think its the screen position node, because in the tutorial im following the node only has one output, but I know nothing about materials. help maybe?

  1. Your parameters’ default values are set to 0.
  2. You’re math is wrong; it’s returning the pixel coordinates floored. The input for the scene texture takes UVs, but you’re giving it pixel coordinates.

dang it works now thank you

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