Particle speed based on luminance of the map


#1

Hey guys i need help with some expressions, so i am working on a galaxy and someone said that a good way to add height to the galaxy that has been emitted from a plane is to set the particles speed based on luminance of the map but i don’t know how to do that, also another way to get height to the galaxy might be to use the min and max distance rather than speed based on luminance of a map.


#2

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