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The only time the size of vector from origin is used (that I know of) is BSPs. They have precision problems whatever units you do them in, and having that precision wobble is doubly evil.
Only because a size of a vector is used in normalization. So I want to move thing A toward thing B, and they're really far away. To use the pluto distance example, say your ship is at the sun and you want to plot a course to pluto. normalize(plutoPos - shipPos);
Right, so "plutoPos" and "shipPos" are both fixed-point numbers. But as soon as you subtract one from the other, that's a RELATIVE vector, and it's totally valid and sensible to store that in floats, because (0,0,0) has an interesting meaning (you're already there!)
That's what this line in the blog post means: " All you ever do with these is subtract one position from another (to produce a float32 delta), or add a (float32) delta to a position."
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