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Are Transform3D's commutative? (lemmy.blahaj.zone)
submitted 3 years ago* (last edited 3 years ago) by to c/godot@programming.dev
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As in, for any two Transform3D objects A and B i might encounter does Godot (4.1) always return A * B == B * A as true? Alternatively is it approximately commutative, ie (A * B).is_equal_approx(B * A), in case there are situations where floating point imprecision messes the exact equality up.

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[–] -1 points 3 years ago*

but for graphics in general, the 4th coordinate is important, even if it is “usually” 1.

Who said it isn't? Transformation matrices acting on R^3^ are 4x4 (since transformation matrices acting on R^n^ are of dimension n+1 in general), whether they're full rank or not.

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