[Sidefx-houdini-list] reversing camera track

Matt Estela matt.estela at gmail.com
Thu Jan 5 09:17:55 EST 2017


This question tickled my interest, was compelled to go work it out:

http://www.tokeru.com/cgwiki/index.php?title=HoudiniVex#optransform_to_do_a_motion_control_style_camera



On 4 January 2017 at 17:54, Andy Nicholas <andy at andynicholas.com> wrote:

> At the moment, you have an animated world->object transform for the
> object. If your camera is at the origin with no rotation (and if it's not
> then it's probably a good idea to do so), then this also happens to be your
> camera->object relative transform.
>
> To have your camera move around instead, you want to invert the animated
> camera->object xform and apply that to the camera, which will become an
> animated object->camera xform. You can then place your object at the origin
> to get you the desired result. The camera transform is then equivalent to a
> world->camera xform which is what you want.
>
> I'm not in front of Houdini at the moment so I can't test out the best way
> of achieving this unfortunately, but that's the basic principle. Going
> through CHOPs to a duplicate camera and object is probably the best bet so
> you can keep it live.
>
> Cheers,
> Andy
>
> > On 4 Jan 2017, at 09:15, Gary Jaeger <gary at corestudio.com> wrote:
> >
> > Scratching my head on this. I have an object track with static camera
> but I’m trying to reverse the motion to have a static object and moving
> camera. The math eluding me.
> >
> > Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
> > http://corestudio.com <http://corestudio.com/>
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