Selection/Picking question---help?

[Ali]

hey..
how will selection/picking work for an imported drawing...e.g. i want to slect/pick drawing in my application that was created in another software such as AutoCad or Paint

thanks

[dorbie]

Define drawing, picking operates on geometry.

If you want to select rendered image portions you would need to render outlines of those selectable portions as geometry.

To pick stuff in a 2D 3D scene, you set the viewport to the pick region, then draw the scene. As you draw the scene you set a unigue hit identifier for each pickable object in the scene. If the objects are visible they will leave a hit code in the pick buffer.