Matrix.tr

transform vector, equals ( m * vec4( v, fc ) ).xyz

only: W==4 && ( H==4 || H==3 ) && isFloatingPoint!E

struct Matrix(size_t H, size_t W, E)
Vector!(3, E)
tr
const
(
X
)
(
in Vector!(3, X) v
,
E fc
)

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