basics are confused

i am very new to openGL,i have a doubt why the vertices values r given only as 0.,1.0… like that, y shouldn’t i mention something like 140,670 like that.???
i am very confused on jargon like world coordinates,eye coordinates … what r all these thing refering to???

Vertices values can be any sort of float value.
I am afraid you will have to learn some of the jargon :
Coordinates : What are the different coordinate spaces

It may be simpler for you to start with glOrtho projection, I found it easier to understand at first : glOrtho allow to display everything inside the given cube-ish space.

Where have gone the time when people spent many to buy a book and learn something. Now, when everything is one click away, and there are so many free books and tutorials on-line, people don’t want to spend even a day learning something. :frowning: