All the time, especially at rendering,
displacement is added only WHEN rendering or rendered (it's stored in memory I believe post render to an extent?)

rendeirng is applied, as it's a super bump map effect, when rendering, if you look at a dispalcement item before it'srendered, it'susually smooth or such, when render get applies, it re-calculates the polygons postion as they are now displaced

so say you had a flat cube, it shows as a flat cube in the display, until you render it

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