We are wondering how to decide a 3d point is visible to a camera?
Because the camera projection in Away3d 4 now,is projecting even when the point is not in front of the camera.

Is there a built-in function to easily decide if a 3d point is visible/in front of a camera?

Thank you.

kick this up to see if anyone could give us some hint on the topic, thank you.

raise me up~

Try the following:

Paul Schlichter - 04 May 2012 01:14 PM

Try the following:

var inFrontOfCamera : Vector3D  = view3D.vector3DtoCheck.subtract( view3D.camera.position );
if ( inFrontOfCamera.dotProduct( viewportA3d.camera.forwardVector ) > 0 )
{
   // vector3DtoCheck is in front of camera !
} 

it works fine totally,wish my math can be as good as you, thank you Paul.

Glad to help
My math isnt that good, just found this solution somewhere else

i don’t use away3D so i just took a look at source;
your point : P1:Vector3D
the projection of your point : P2 = camera.project(P1)

if (P2.z>0) {
  the point is front of the camera
}

to be visible somthing like that:
P2.x<=1 && P2.x>=-1 && P2.y<=1 && P2.y>=-1 && P2.z>0 && P2.z<1