Here’s what I’m experiencing: I’m running the 3d analysis for the first time and am at the calibration and undistortion stage. Corner detection looks good for all camera-1 and camera-2 calibration images. However, upon running calibrate_cameras and check_undistortion, the undistort files are either completely black or contain odd, extreme crops/warps that do not include the grids. I’ve tried all alpha values (0:.1:1) and nothing seems to return a sensible result. Curious what your diagnosis might be. Attached are the original, checkerboard, and undistorted (.2 and .9 alpha) outs from the check_undistortion step.Thanks!