On Monday, 7 December 2020 at 13:48:51 UTC, jmh530 wrote:
On Monday, 7 December 2020 at 13:41:17 UTC, Ola Fosheim Grostad
wrote:
On Monday, 7 December 2020 at 13:17:47 UTC, jmh530 wrote:
[snip]
"no need to calculate inverse matrix" What? Since when?
I dont know what he meant in this context, but a common
technique in computer graphics is to build the inverse as as
you apply computations.
Ah, well if you have a small matrix, then it's not so hard to
calculate the inverse anyway.
It is an optimization, maybe also for accuracy, dunno.
So, instead of ending up with a transform from coordinate system
A to B, you also get the transform from B to A for cheap. This
may matter when the next step is to go from B to C... And so on...
