joining two points

OpenGL OpenGL: Advanced Coding
1

Hi

I have a grid whereby I want to be able to select a point on that grid and then join it to another - what is the best way of tackling it - any code snippets/ ideas?

thanx

2

Assuming that you know the coordinates of all of the grid points, the only way I can think of is to get the mouse-click location, transform it into your coordinate system, figure out which point they are nearest to, and start the line there. Etc.

Chris

3

any one have selection code for mouse hitting a pixel?

[This message has been edited by fox (edited 05-09-2001).]

4

Project your points from 3D space to 2D coordinates using gluproject. Then compute nearest point using a 2D distance.
di=sqr((xi^2+yi^2))

Select the point on the grid with smallest di to your mouse click.

5

Any code snippet?

cheers

6

Originally posted by fox:
[b] Any code snippet?

cheers[/b]

For the 2D-3D stuff (gluProject and gluUnproject) look at

http://www.opengl.org/discussion_boards/ubb/Forum2/HTML/002179.html

[This message has been edited by Kilam Malik (edited 05-10-2001).]