added set_matrix
update matrix setting and move lookat function
fixed typo
correct variable being set
set position after lookat
improve readablity
simplify lookat
extend and remove need for matrix
making matix to set quaterians from
replace y calculation
make tubes round
arrowhead on lines
change orientation of cylinder
move set_matrix
switch end of arrowhead
debugging
debugging
indexing
return mesh
alineing arrowhead