How to draw a continuous mesh wall in triangles? So it isn't missing half the triangles?

I don’t know exactly what you want to achieve overall.
Perhaps you can take some inspiration from the design of my showroom?

see also

wall:

SHOWROOM/showroom/showroomBuildt.js at aa7a082a1b7dacd17e1d075f95215d2858212b67 · hofk/SHOWROOM · GitHub

line 239 function buildWall( i )