You then need a "distance to plane" calculation... the distance from the camera to null is the hypotenuse of a right triangle. The angle of that line versus the z axis of the camera then gives you enough information to determine the distance to the camera plane the null is on.
cos(theta)=a/h where you want the length of the adjacent side (a)... So the value you seek is cos(angle)*distance to null. On Fri, Mar 29, 2013 at 3:38 AM, Emilio Hernandez <emi...@e-roja.com> wrote: > Yes it's working with the null centered. But what if I want the focus on > some moving object that is not always in the center of the camera and > coming near? It is like a follow focus rig. > > > > > 2013/3/29 Ben Davis <benjamincliffordda...@gmail.com> > >> Makes sense, thanks Tim! >> >> That means that the info from the "Distance to Output Camera" is doing >> exactly what you need Emilio, since when centered the ICETree info matches >> perfectly. >> >> -- >> Ben Davis >> >> www.moondog-animation.com >> >> +33 6 88 48 54 50 >> >> >> On Fri, Mar 29, 2013 at 10:31 AM, Tim Leydecker <bauero...@gmx.de> wrote: >> >>> Hey Ben, >>> >>> the farther offset the null is off center to the center of the camera >>> view >>> the more "off" the DOF would be because the DOF effect is sets in respect >>> to the viewplane of the camera and it would take some Pythagorean theorem >>> (http://en.wikipedia.org/wiki/**Hypotenuse<http://en.wikipedia.org/wiki/Hypotenuse>) >>> to get the desired major cathetus, >>> which is the Distance between Camera Center and a "Plane" from the >>> shorter >>> cathetus. >>> >>> To avoid that, itæ„€ easier to constraint the camera to "look at" the null, >>> then the hypothenuse "snaps back into" the longer cathetus and there is >>> no offset anymore to worry about. >>> >>> Cheers, >>> >>> tim >>> >>> >>> On 29.03.2013 10:06, Ben Davis wrote: >>> >>>> It looks like "Distance to Output Camera" from the viewport options is >>>> spitting out the info from a plane in front of the camera based on the >>>> distance from the null if it were in the center of your camera's view. >>>> If >>>> your null is centered, the values are the same from the ICETree and the >>>> viewport info. >>>> >>>> The ICE info from the "Get Distance Between" is exactly the distance >>>> from >>>> center to center (global.kine to global.kine). I don't see a problem >>>> with >>>> using the info from ICE to feed into your DOF, you're probably going to >>>> get >>>> a more precise focus placement (I'll accept being refuted by the >>>> photographers out there :) >>>> >>>> Hope that helps! >>>> >>>> Ben >>>> >>>> -- >>>> Ben Davis >>>> >>>> www.moondog-animation.com >>>> >>>> +33 6 88 48 54 50 >>>> >>>> >>>> On Fri, Mar 29, 2013 at 9:20 AM, Emilio Hernandez <emi...@e-roja.com> >>>> wrote: >>>> >>>> Hello I am trying to rig the camera DOF so I can attach the distance >>>>> to a >>>>> null. I am the ICE distance between node. But when I turn on the >>>>> distance >>>>> to output camera from the viewer, it gives me a different result. >>>>> >>>>> So the Distance to output camera from the viewport options is different >>>>> than the Distance between node in the ICE tree using the >>>>> kine.global.pos >>>>> from the camera and the null. >>>>> >>>>> I will appreciate any help on this issue. >>>>> >>>>> -- >>>>> >>>>> >>>>> >>>> >> > > > -- > >
