Advanced 3D/Video Compositing - Mastering Blender - page 738

Your average solve error for the scene ideally should be less than 0.5 pixels. A solve error greater than 3
pixels is unacceptable. A solve error between those values is dicey but may be usable depending on the situ-
ation.Foronething,thesignificanceofapixelwidthdependsontheresolutionofyourfootage.Apixel'sworth
of error on 5K footage is less of a problem than a pixel's worth of error on much smaller footage.
Highersolveerrorsarelikelyindicativeofpatchesoftotalwrongness.Inthesecases,ifyoutrytoreconstruct
the scene, you'll see the camera jumping around haphazardly, and the reconstructed 3D scene will go haywire
on certain frames.
Big solve errors can be the result of small problems. If your tracked scene looks okay, the problem is likely
the camera settings. Try adjusting the settings, and choose Focal Length, Optical Center, K1, and K2 from the
Refinement menuontheToolshelf.Thecamera solversometimes requires somejiggling togetthefocal length
estimated properly, so try setting the focal length at various values by hand and rerunning the camera solver.
Like bad apples, one bad track can screw up the camera solution for all the rest. The camera solver tries to
make all the tracks make sense together. If one of the tracks is crazy, for example, if it's enabled when it should
be enabled and is sliding across the space, this will have a corrupting effect on all the other tracks.
If 3D markers are set to display, they will show up in red if their error value is greater than 1 and green if
their error value is less than 1. You can see where they are in relation to the 2D markers, as shown in Figure
10-20 .
Figure 10-20 A 3D marker with an error of greater than 1