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dotCooCoo 2d0fa32d30 Docs: the projection checks compare absolute values
The horizon test compares a point's signed w with the largest absolute
value in the bottom row, and the invertibility test compares the
absolute value of the determinant with the largest absolute value among
its six products, so a negative determinant counts as invertible. A
stored projection that overflows is divided by the largest absolute
value in its bottom row.
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