| Author | Message | ||
     Jorge Boetsch (Voxel) New member Username: Voxel Post Number: 1 Registered: 6-2007 Rating: N/A |
Hi! Ive ben making stereoscopic video and I want to know how can i make an object come out of the screen. I have acheeve good 3d Footage, but i havent been able to make a logo fly "out" of the screen. Shoud i converge the cameras on the object aproaching? Please help i need the tip! | ||
| Scott Warren (Scott_warren) Junior Member Username: Scott_warren Post Number: 30 Registered: 8-2006 Rating: N/A |
If you converged the cameras in realtime, with the motion of the object, it would "stay put" while the background would "recede". When you say "logo" do you mean like 3D text? If so, BluffTitler can be set up to output stereo versions of the 3d text rendering (with alpha for compositing). For something to act like it's "flying out of the screen", the relative difference between the InterAxial Distance (cameras) and the projected/InterOccular Distance (viewer's eyes) has to change. For something that's actually NOT moving, but is using the IAD change to simulate movement, the IAD has to keep INCREASING relative to the IOD. This wouldn't work if there were other objects in the scene (you'd get hyperstereo/lilliputism instead), but could work with Bluescreen/Greenscreen compositing techniques. If you're using a 3D modelling/rendering/animation app, just set you stereo camera rig to the usual infinity/parallel linked setting and actually animate the move of the object in the app. I don't know what else to say, maybe I'm not getting your question correctly... Scott | ||
| Jorge Boetsch (Voxel) New member Username: Voxel Post Number: 2 Registered: 6-2007 Rating: N/A |
Scott: Thanks for your answer, i will try to explain myself better, i have a poor english. We are using 3d Studio Max, and we tried allready your last advice, (just move the object towards the paralell cameras), but we ended up with a double image, instead of an object "floting in front of the screen". ...Any idea why? | ||
| Scott Warren (Scott_warren) Junior Member Username: Scott_warren Post Number: 31 Registered: 8-2006 Rating: N/A |
It's probably a "double image" because the parallax is TOO different for you eyes/brain to accommodate. This could be because your virtual camera rig is already set up in "hyperstereo" (wider IAD than normal eye distance) instead of "orthostereo" (same as normal eye distance) relative to your object distance(s). Focal length (and distance from the main object plane) with affect this also--for longer focal lengths, the disparity will be greater, so the IAD should be lowered to compensate. Remember the 30:1 rule--it's a good starting place for setup. Yes, there's a lot of variables to have to juggle. IIWY, I'd experiment with (virtual) camera placement (both IAD and focal distance), camera focal length, overall object size, and camera convergence (though it can get real problematic/complicated when you veer from parallel). Try 1 parameter at a time and see where the changes occur. |
