Beshmeee

I want to be able to move my mouse over the floor of this room but extract the coordinates as if on the flow (imagine the floor is a grid of squares).

At the moment I've been doing a rough and ready extraction of the mouse position on screen completely independent of OpenGL on the 'back wall' of the room, but I really want to do this in GL as ultimately I'll be rotating the view of the room, but still need to extract the positional data.

Lastly there will by a fair number of objects that I will be pointing at - all created in GL using obj files and it will be the position of these object I need to find and later track as they move.

Any thoughts. Guessing at the stage it will be to do with worldtoscreen/sreentoworld message, but can this be done with many objects independently?

I have a 'scene' of a room in GL.
I want to be able to move my mouse over the floor of this room but extract the coordinates as if on the flow (imagine the floor is a grid of squares).
At the moment I've been doing a rough and ready extraction of the mouse position on screen completely independent of OpenGL on the 'back wall' of the room, but I really want to do this in GL as ultimately I'll be rotating the view of the room, but still need to extract the positional data.

Any thoughts.  Guessing at the stage it will be to do with worldtoscreen/sreentoworld message, but can this be done with many objects independently?


3d-coordinates

this is not easy. i think your best bet is to look at the java example in:

Max5/examples/jitter-examples/java/jitjavagui-example.maxpat

and the java files used by this mxj, specifically Max5/Cycling '74/java/classes/JitterGuiElement.java

this file uses the method Jitter3DUtils.intersectLineQuad to perform collision detection.

also check out the COSM library, which provides some collision detection features:

this is not easy. i think your best bet is to look at the java example in:
Max5/examples/jitter-examples/java/jitjavagui-example.maxpat

and the java files used by this mxj, specifically Max5/Cycling '74/java/classes/JitterGuiElement.java
this file uses the method Jitter3DUtils.intersectLineQuad to perform collision detection.

also check out the COSM library, which provides some collision detection features:
http://www.allosphere.ucsb.edu/cosm/


Thanks Robert, I had a feeling it might go this way on reading some other posts.

3d coordinates