1 create an ice tree on a null(call the rig) > 2 get scalar to 3d vector node (you will only change z through a slider, x, y, should be 0)> 3 get a srt to matrix node > 4 plug the scalar to 3d into position of srt to matrix> 5 get a 4x4 matrix node> 6 connect the srt to matrix out to value of 4x4 matrix> 7 get data node camera.kine.global> 8 get a multiply node and connect 4x4 matrix into first port, camera.kine.global into second(order matters)> 9 get a set data node> 10 connect the multiply node's out into value of set data and give it a name like 'xfo' or something>
11. On the controller to snap, create another ice tree. Get data rig.'xfo' and set data to self.kine.global. you are done. Just move the camera and the controller will follow. To move it on the camera ray path just use the slider created in the step 2. Wrote this right of the top of my head, did not try it in ice actually. But should work. Just get the distance between the controller and the camera through an expression or through ice. I suggest expression because getting vector lengths is expensive in ice (that is also the reason we have squared distance node in case it is just a comparison of distances). Cheers! Alok. On Thu, Sep 26, 2013 at 5:15 PM, Tim Crowson <[email protected] > wrote: > But the distance I want is the distance between the camera and the > closest point on an arbitrary geometric surface behind the target. Now > maybe the easiest thing to do would be to snap the target to said surface > and get that distance. But there again, I need to identify the position in > space where the ray from the camera intersects that surface. > > -Tim > > > On 9/26/2013 4:09 PM, Christian Freisleder wrote: > > Hey Tim, > I would use a expression. > open the exression editor-->Function-->Distance-->distance to camera > the result would be something like > ctr_dist_cam( null. ) > null. would be the object name you're using to mesure the distance. > hope that helps > christian > > On 26.09.2013 22:58, Tim Crowson wrote: > > I'm trying to set up a camera rig that will let me use an item of some > kind (null, curve...) to act as a kind of focal point that can be moved > around the frame. Basically I want to have a control parented to the camera > which I can move around the frame, and which can be used to create a vector > between the camera and whatever surface is "behind" that focal control. I'd > then get the distance between the camera and that point on the surface and > pass that to my lens shader. > > I'm really a noob when it comes to ICE in general, so I'm wondering how > best to do this. I suck with vectors... > -- > > > > *Tim Crowson > **Lead CG Artist* > > *Magnetic Dreams, Inc. > *2525 Lebanon Pike, Building C. Nashville, TN 37214 > *Ph* 615.885.6801 | *Fax* 615.889.4768 | www.magneticdreams.com > [email protected] > > *Confidentiality Notice: This email, including attachments, is > confidential and should not be used by anyone who is not the original > intended recipient(s). If you have received this e-mail in error please > inform the sender and delete it from your mailbox or any other storage > mechanism. Magnetic Dreams, Inc cannot accept liability for any statements > made which are clearly the sender's own and not expressly made on behalf of > Magnetic Dreams, Inc or one of its agents.* > > > > > -------------------------- > To unsubscribe: mail [email protected] with subject > "unsubscribe" and reply to the confirmation email. > > > > > -------------------------- > To unsubscribe: mail [email protected] with subject > "unsubscribe" and reply to the confirmation email. > > > -- > > > > > -------------------------- > To unsubscribe: mail [email protected] with subject > "unsubscribe" and reply to the confirmation email. > --
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