[Sidefx-houdini-list] reversing camera track
gary at corestudio.com
Thu Jan 5 10:11:06 EST 2017
Sweet, Matt! I’m going to dig into that. Thanks!
Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
> 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:
> 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.
>>> 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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