matrix image flip

[thient]

I have a matrix 20x55.  I have to split up into port 3=500 and port 4=600 pixels.  The addressing is correct but the images and text flip upside down when it goes between port 3 and 4.  I have looked at all the setting but I cannot find a solution.  Has anyone seen this before?

Xlights =  latest version
Pixel controller =  latest firmware
fpp= latest version

Any help is greatly appreciated.

[k6ccc]

Almost guaranteed that the physical prop and the way it modeled in software don't match.
For example the software thinks that the pixels start at the top left, but the actual prop starts at the bottom left.

[jnealand]

I had that problem when I built my 50w x 20h matrix.  It happens because I started at the bottom left but the individual port pieces did not start there.  I ended up having to make a model for each piece and group them but also make a shadow model that was a one piece model.  After two years, I went back and put all 1000 pixels on one port (a PiCap no less) and then added power injection in two places.  Oh the things you learn over time.  All works good now and no shadow models or grouping of pieces.  Plus I don't have to remember all the strange things I did to make it work every year when I start over.  sigh