User clipping plane

hi all:
the spec. specific the user define clipping plane coefficients in object space
and must transform to viewing space and perform DOT operation with a viewing space vertex.

if i want to implement the user define clipping plane feature using
per-pixel clipping(like texkill in shader)

does the DOT operation must perform in viewing space?
or it’s OK in object space?

As long as it behaves identically, implementation details don’t matter.

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