3/16/2024 0 Comments Maya camera lens distortion![]() Scale the resolution up until the edge of your plate are back inside the render area. So to do this in 2D apply a reformat node after the lens distortion set to scale and a resize type of none. Either way anything coming back into nuke should be rendered slightly larger because when you apply your distortion back on it is going to suck the edges back in towards the center. To fix this you can either ignore it and request 3d to overscan by a certain percentage or render out the plate at a slightly larger resolution like an overscan inside nuke. This sim was a little less then that at 19.69mmX2 = 39.38mm but the track was solid so Im sticking with them.Īfter the lens distortion is removed your plate should extend out over the render area. The first time I had used the wrong resolution but it came out to 24mmX2 = 48mm. I tracked this footage a few times and it always gave me slightly below 50mm for my lens. After you input this info go back to the first tab an track the footage and output a scene with a camera. SO shooting at 5k anamorphic is actually 17.8mm X 14.58mm. I shot on the Red Epic and had to check the support page because the red cameras window the sensor at different resolutions essentially changing the filmback size. Now in the solver tab I used the unknown constant because not all lenses are bang on 50mm or 85mm etc and then put in the filmback size from the camera. *This way was a lot more accurate then using the lens distortion node to remove it and selecting no distortion in the camera tracker. So I have an anamorphic lens and a stretch factor of 2, and after you do the grid analysis the rest of the values will fill out.Īfter using the lens grid to calculate the lens distortion, copy these values into the camera tracker and select undistort input. First add in the parameters that you know so the computer doesnt guess and get these values wrong. So once the plate is desqueezed you can setup the lens distortion. Also I had to shrink the plate down a bit but from 5Kana down to around 2K but this may be because Im doing some of this on a laptop. If you just try to analyse the lines you may get odd results, it seems like you have to reformat the grid so it is no longer squeezed. ![]() If you are going to be tracking anything in these plates you really should shoot a lens grid. I was able to get most of the info I needed off the support page on Red.com and downloading the manual for the Epic camera. Then once you move into 3d you will find some settings no longer match up and you might have to redo everything or accept that its not going to be perfect. Do not automatically use the 2k or 4k cinemascope formats because the aspect ratio may not match up with what you actually shot. Import your footage into nuke as the original squeezed source then Set the project to match the resolution of your footage and the pixel aspect ratio should match the stretch of your lens.
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