When you enable trim bbox the size of the bounding box will be reduced to fit within the actual output format, and no overscan pixels will be output or computed. When you are compositing redistorted items onto the source you generally don't want to have this overscan. For example, when reintroducing distortion, there will be overflow outside of the image. When you apply distortion to the image, the bounding box that SyLens receives will usually grow. This selects the filtering algorithm used for sampling the source image, pick one that gives a better-looking result trim bbox Apply some margin here to shift your distortion midpoint up or down with regards to the center of your digital plate. This can occur when a lens is fitted onto the camera but not properly centered onto the sensor (some lens adapters are especially susceptible to this, like the anamorphic Alexa fittings). Sometimes you are dealing with off-center lens distortion. Apply some margin here to shift your distortion midpoint left or right with regards to the center of your digital plate. If you used this in Syntheyes you can apply it here as well. This is calculated by Syntheyes and needs to be punched in here. When set to apply disto SyLens will apply lens distortion k When set to remove disto, SyLens will remove lens distortion.
See to it that other settings - k, kcube - stay the same! To redistort, plug your oversize plate into a copy of SyLens with the "output" switch set to "apply disto". You will probably note that the bounding box of your output will stick outside the format - this is perfectly fine, read below how to deal with that Redistorting footageĪfter all is done you might want to redistort either your whole comp or only the piece of CG that came to you from 3D (since it would have been rendered from the undistorted film back size). Then just punch in the computed distortion value into the k knob Punch in the lens distortion into the lens settings panel When you start Nuke the next time there is going to be an extra icon in your node toolbar. uginAddPath('sylens-311') # For the unzipped release
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