I wasn't sure were to post this but here is my question...
I have this formula type thing to fill a 4*4 matrix (for directx) but they use 3 functions that I have no clue about.
I don't know normal, cross, or dot. I tried to look them up but didn't get far, I think I have a little understanding of dot though.
zaxis = normal(At - Eye)
xaxis = normal(cross(Up, zaxis))
yaxis = cross(zaxis, xaxis)
xaxis.x yaxis.x zaxis.x 0
xaxis.y yaxis.y zaxis.y 0
xaxis.z yaxis.z zaxis.z 0
-dot(xaxis, eye) -dot(yaxis, eye) -dot(zaxis, eye) 1