Hey Tim -- Doesn't the position of the null == the "position in space where the ray from the camera intersects that surface" when you've snapped the null to the geo in the viewport?
This might be simpler although less cool than the ICE approach. You'd also easily be able to keyframe the null's position. 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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