4 ms·
It’s puzzling - even in most of the mathematical literature, x_0 is used for the homogeneous coordinate.
by joppy 7y ago
It’s puzzling - even in most of the mathematical literature, x_0 is used for the homogeneous coordinate.
- orbots 7y agoMemory layout. You can do a hacky "cast" from a homegeneous 4-vector to a ideal 3-vector for free. Same pointer.
- joppy 7y agoThis would mean that you have to make sure elsewhere in your code that the last coordinate is always normalised to 1, so do you win overall using this strategy? Plus, the same cast in the other method is ptr+1, which is assumedly just as fast.