[Sidefx-houdini-list] size of a pixel sample a a particular camera depth?

Dan Wills gdanzo at gmail.com
Mon Feb 10 21:56:18 EST 2014

G'day Robert,
We have a tool for this, which implements this formula:

pixelSize = ( length( vector from P to camera centroid ) / focalLength ) *
( Aperture / ResX )

Which looks like this in vops:

[image: Inline image 1]

Hope that helps :)

On Tue, Feb 11, 2014 at 9:57 AM, Robert Kelly <isstuff at gmail.com> wrote:

> I am currently working on this problem and was wandering if someone has
> already solved how to get a size of sample at a particular depth?
> given a point in a point cloud and a camera with its resolution, aperture
> and focal
> The problem i dealing with is getting point replicate procedural to use
> just the rite number of points when a cluster of 50 points covering 2
> pixels is a waste.
> so anyone already solved this one that would be better than reinventing the
> wheel.
> Thanks
> Robert.
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