di to getInstanceOrNull
G6 to eval
nb to vertexBuffer
format
ob to colorBuffer
remove useless code
vertexBO, colorBO, vertexBuffer, colorBuffer
pc to writeDepth, Rc to curDepth
K to vbLen, N to cbLen
 to flushBuffer
remove useless code
unused tb
tb to exitWhenError
comment
onKeyPress,Down,Up
M to instance
Cx to instance
Sc to curAdditive
should be lowercase
support local debug