How to get a 3D position from 2D screen coordinates

Anteater · Post by **Anteater** » Wed May 02, 2007 9:02 pm

How would I get a 3D position from 2D screen coordinates? For example, how would I take the position of the mouse cursor and get a vector3df of the 3D position it's hovering over?

Swarmer · Post by **Swarmer** » Wed May 02, 2007 9:22 pm

I think tutorial 7 (http://irrlicht.sourceforge.net/tut007.html) will explain it.

Tanuva · Post by **Tanuva** » Thu May 03, 2007 2:07 pm

A little variation of the question: How do I get a vector3df from a vector2df? I gonna work with 2d values in my game (2d math - 3d gfx) and the scenenodes want 3d vectors for their positions... Since simply reading the two directional values from the vector2df doesnt work (no methods to access them), how do I realize such?

Sylence · Post by **Sylence** » Thu May 03, 2007 2:16 pm

If you keep in 2 dimensions you can set the third value of the vector to 0. so you can convert the vector like this:

Code: Select all

vector2df pos2d(10,14);
vector3df pos3d(pos2d.X,0,pos2d.Y);

Tanuva · Post by **Tanuva** » Thu May 03, 2007 2:23 pm

Arr! I tried that way, but wrote vector2df.x instead of *.X - case sensitiveness can be damn tricky... Thanks!