the angle between the two planes is the dot product of the normals to the two planes?

Correct.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP PCW

In reply to Re^5: (OT) moving points from one plane to another by BrowserUk
in thread (OT) moving points from one plane to another by merrymonk

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