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Q: I have a 720×486 background source footage that I am using in 3ds MAX. It wont be stabilized until the end of compositing, but I want to render more area in my 3d frames to allow for when the frames get shifted later (so there is still 3d scene there). When I increase the width of pixels in the renderer, all it does is crop the top and bottom of my camera and doesnt give me any more area on the sides where I need it. Its kind of like those cheap cameras that say they take panoramic pics, all they do is crop the hell out of the top and bottom of the frame. anyone know how to do what I need to do here???
thank you,
Marc
Hi.
As you’ve noticed, the image width in 3ds is locked on ont the fov as long as you’re vorking on an image wider than higher (which is obviously your case). My suggestion would be, if you want to preserve a correct Fov and ratio : render a wider image of your original shot with your 2d package, let’s say with an extra black frame wherever you need it. Use this footage as your background/environnement in 3ds, resizing your rendering outpout to the new size. Then, Re do your camera matching/ 3d tracking operations, in order to get a correct fov matching your new output size. That’s about it.
P.S. instead of using black to frame your original footage ine your 2d pack, try using a mirror or zoomed extension of your image, int order to avoid any black outline on your 3d material rendered on the side areas (w. motion blur, particles, volumetics or transparencies…)L.T.
And by the way, if your issue is ONLY to increase your image range on the sides, and not on the top/bottom (as in a true panoramic), there is a trick : in your standard rendering parameters menu, copy the value of the initial rendering image width (the input footage one) into your Apperture width (note your previous value if you’re using it, as for camera matching). Then, copy the value of your cameras’s fov into your clipboard. Note that the value will appear weird, since the apperture will probably be out of the classic ranges.
Then, set your rendering width to your new value (larger then the previous one), and copy this value into the apperture again. As you know it, the image will appear to be croped in the vertical axis.
Now here is the trick : paste your old FOV value from your clipboad into the camera’s fov value, and ther you are.
you now have your exact image, but with a wider fov, yet preserving the original height.
Last but not least, enter your original apperture value to recover your original fov value scale.Come to think about it, this method works well for any “field of visibility” increase, be it horizontal, vertical or both (just ensure to re-enter your orignal image ratio in that case as a laste step).
Hope it helps.L.T.
France (that’s for the crappy writting)
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