A pair of octahedral complexes showing the differences between Fac and Mer isomers. The triangles are added for emphasis.
These molecules were modeled through a combination of ORCA, UCSF Chimera, and Blender.
https://orcaforum.kofo.mpg.de/app.php/portal
https://www.rbvi.ucsf.edu/chimera
https://www.blender.org/