in the second sentence, there is a misspelling, where OpenGL is spelled OepnGL. There is also a rogue "A" in the same sentence.
Both emboldened below.
The ofMatrix4x4 is the big class of the math part of openFrameworks. You'll sometimes see it used for doing things like setting where the camera in OepnGL (the mathematically calculated one, not the ofCamera one) is looking or is pointedA, or figuring how to position something in 3d space, doing scaling, etc.
in the second sentence, there is a misspelling, where OpenGL is spelled OepnGL. There is also a rogue "A" in the same sentence.
Both emboldened below.