A simple test to figure out what the pixel hit resolution parameter does:
Use Technical proposal benchmark as reference:
Default pixel resolution is written down in this file: tkgeometry/config/stdinclude/ModuleTypes/pixel
resolutionLocalX 0.013 resolutionLocalY 0.028
pt 1000 Real 2.30948 Ideal 0.53651 Loss 4.3
d 1000 Real 0.00601 Ideal 0.00241 Loss 2.5
z0 1000 Real 0.00696 Ideal 0.00273 Loss 2.5
Make the following change to Barrel BPX in PixelTechnicalProposal2014.cfg:
Layer 1,2,3,4 { resolutionLocalX 0.001 // 1 um }
pt 1000 Real 2.18685 Ideal 0.04127 Loss 53.0
Make the following change to Barrel BPX in PixelTechnicalProposal2014.cfg:
Layer 1,2,3,4 { resolutionLocalY 0.001 // 1 um }
pt 1000 Real 2.30948 Ideal 0.53651 Loss 4.3
z0 1000 Real 0.00496 Ideal 0.00010 Loss 50.8