Re: Camera distance to an object
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. --
Re: Camera distance to an object
Thx Ben. The thing is the distance between node output is almost twice the distance reported by the viewport. If I use the value of the Distance Between node, the focus is farther than the expected. I am right now dividing the result by 2 and I think I am getting there and getting the focus plane where I want. I am trying to figure out the logic on this and the only thing that comes up to my mind is that maybe the focus distance is splitted in two. One half is from camera to object and the other is from object to camera. Don't know if I explained myself or is there some logic into this. 2013/3/29 Ben Davis benjamincliffordda...@gmail.com 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.comwrote: 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. -- --
Re: Camera distance to an object
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) to get the desired major cathetus, which is the Distance between Camera Center and a Plane from the shorter cathetus. To avoid that, it´s 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. --
Re: Camera distance to an object
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/**Hypotenusehttp://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, it愀 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. -- attachment: DOF_center.PNG
Re: Camera distance to an object
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/**Hypotenusehttp://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, it愀 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. -- --
Re: Camera distance to an object
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/**Hypotenusehttp://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, it愀 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. -- --
Re: Camera distance to an object
Cool I will try that thanks a lot! 2013/3/29 Andy Moorer andymoo...@gmail.com 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.comwrote: 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.dewrote: 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/**Hypotenusehttp://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, it愀 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. -- -- --
