To render geometry edge:

make a material and apply it to any mesh:

I learned: use Ceil and Power to make hard edge.

(A Ceil, or Ceiling, expression is a simple rounding expression that takes in one input and rounds its value up to the next integer. This is different than typical rounding in that values that

would typically round downwards, such as 3.1282, would actually round upwards to 4. The opposite of this expression is the Floor material expression. )

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