[Sidefx-houdini-list] reversing camera track

Neil Scholes neil at uvfilms.co.uk
Thu Jan 5 10:37:34 EST 2017


Nice thanks Matt !

Sent from my iPhone

> On 5 Jan 2017, at 15:11, Gary Jaeger <gary at corestudio.com> wrote:
> 
> Sweet, Matt! I’m going to dig into that. Thanks!
> 
> Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
> http://corestudio.com <http://corestudio.com/>
>> On Jan 5, 2017, at 6:17 AM, Matt Estela <matt.estela at gmail.com> wrote:
>> 
>> 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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