|
|
Could you post a working demo scene?
thanks very much.
D.
"None" <Non### [at] onca> wrote in message
news:Xns### [at] 204213191226...
> As an educational exercise for myself I've created a set of macros to
> handle quaternions, which can be useful for rotations. I've compiled
> these macros into an include file which I've attached.
>
> Povray thankfully includes the built-in "vaxis_rotate()" function. That,
> along with a number of great macros in "transforms.inc", allows you to
> handle pretty well all of your "rotational" requirements. So why would
> you want to use quaternions to do rotations in Povray? Primarily for
> incremental and true angular interpolation rotations. And I've found a
> few other uses myself, you might as well.
>
> Quaternions are 4D vectors. Yes, they use complex numbers and are
> difficult to understand, but you don't need to preoccupy yourself with
> any of this to take advantage of them for 3D rotations. You can think of
> a unit (normalized) quaternion as a representation of a rotation. So one
> single 4D vector can represent any rotation around any axis. When you
> multiply two unit quaternions together, you are effectively adding two
> rotations together. Other quaternion tricks are used in these macros
> which you may find useful.
>
> If anyone else finds this useful, let me know.
>
>
Post a reply to this message
|
|