Transform coordinates from 3d to 2d without matrix or built in methods
- by Thomas
Not to long ago i started to create a small 3D engine in javascript to combine this with an html5 canvas.
One of the issues I run into is how can you transform 3d to 2d coords.
Since I cannot use matrices or built in transformation methods I need another way.
I've tried implementing the next explanation + pseudo code:
http://freespace.virgin.net/hugo.elias/routines/3d_to_2d.htm
Unfortunately no luck there. I've replace all the input variables with data from my own camera and object classes.
I have the following data:
An object with a rotation, position vector and an array of 4 3d coords (its just a plane)
a camera with a position and rotation vector
the viewport - a square 600 x 600 surface.
The example uses a zoom factor which I've set as 1
Most hits on google use either matrix calculations or don't implement camera rotation.
Basic transformation should be like this:
screen.x = x / z * zoom
screen.y = y / z * zoom
Can anyone point me in the right direction or explain to me howto achieve this?
edit:
Thanks for all your posts, I haven't been able to apply all this to my project yet but I hope to do this soon.
