I second this motion.
> We should also decide which way is up. I like the OpenGL coordinate
> system, which has X increasing to the right, Y up, and Z coming out of
> your monitor.
>
> Non-symmetric objects that move should be defined so that increasing
> their X position makes them look like they are moving forward. For
> example, if modelling a car, the headlights should shine down the +X
> axis and if you look out the sun roof you should be looking in the +Y
> direction.
Going with OpenGL does have some advantages ... except that most
"ordinary" (what ever that is) people think of x to the right, y
is forward, and z is up. Certainly, that's what is taught in grade
school, high school, and college ....
> Date: Tue, 2 Aug 1994 14:37:23 PDT
> From: Mike Roberts <[email protected]>
> Subject: Re: Standardizing coordinate systems, units of measure
>
> I also think "inside space" co-ordinate systems and "outside space"
> co-ordinate systems are different things. What about the galactic model
> sitting, fishtank like, on my bookshelf ? On the outside it is quite small, but
> inside .. really huge ...
Mike,
That's exactly the point that Gavin Bell is making. Transmitted together
with the galaxy model is a transform matrix that says "divide all
dimensions by 365 x 24 x 3600 x 3 x 10^8", so that your galactic model
can be expressed in light-years, despite that fact that it is a mere
one meter off the floor in your living room. That's the whole point
of having "modelling matrices".
--linas