[Sidefx-houdini-list] export 2d track to 3d

jose fernandez jose.fernandez at framestore-cfc.com
Mon Mar 17 11:33:39 EDT 2008

Well basically have a point in an arbitrary place in 3d space, that 
moves proportionally in screen space as the 2d track. no matter where 
the camera is...

brian goodwin wrote:
> There many solutions to this,
> but to get a better idea of what u are trying to achieve,
> are you trying to use the 2D track in 3 Dimentions or just have a flat plane
> with locators that move on that flat place?
> On Mon, Mar 17, 2008 at 3:09 PM, jose fernandez <
> jose.fernandez at framestore-cfc.com> wrote:
>> Hi I'm trying to export a 2d track into 3d space. I've brought in the
>> data through chops and fitted it to uv space (0-1) through a range node
>> (1-2048 in x, 1-1556 in y).
>> My first try was to use a grid at a certain point to project uv
>> cordinates from camera... and transferring attributes between chops and
>> the grid with point sops and finally a transfer attribute that copies
>> color with the 3d information in it to the tracking point. In short this
>> technique worked, but the metaball sampling doesn't seem to be accurate
>> enough and while the point is at the expected position I get random
>> jumps every few frames as it moves. I've tried playing with the kernel
>> values but nothing makes it better.
>> Could any ones suggest a more intelligent (and accurate) approach?
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