Can't seem to get this to work :( Here's my code
var camForDirVector:Vector3D = camera.transform.deltaTransformVector(Vector3D.Z_AXIS); camForDirVector.normalize(); var objectPosVector:Vector3D = new Vector3D(myMesh.x, myMesh.y, myMesh.z); objectPosVector.normalize(); var dotProd:Number = camForDirVector.dotProduct(objectPosVector); var angle:Number = Math.acos(dotProd); Can't find any relation between the dotProd or the angle for when the object is outside the camera view area... Am I doing something wrong? On Dec 11, 5:42 pm, Miguel Kennedy <[email protected]> wrote: > Thanks so much Michael! > > I'll give it a try ;) > > Have a nice weekend! > > On Dec 11, 5:27 pm, Michael Iv <[email protected]> wrote: > > > > > > > > > Miguel ,I don't have something ready right away but this is easy .It goes > > like this: > > > +camera forward position vector > > +object position vector > > normalize both > > use Vector3D dotProduct() to get their dot product > > If you need an angle between them extract it by var > > angle:Number=Math.acos(dotProduct) (it is in radians) > > > On Sat, Dec 11, 2010 at 5:27 PM, Miguel Kennedy <[email protected]> wrote: > > > Hi Michael! > > > > Thanks for the quick reply! > > > > Regarding: > > > > "you can find if the object is in front of the camera view or > > > behind with dot product calculation(deriving the angle between camera > > > and > > > your object, or just checking dot-if negative its behind the camera)" > > > > Do you have any code example of how this can be done? > > > > Thanks so much for your time! > > > > On Dec 11, 3:19 pm, Michael Iv <[email protected]> wrote: > > > > you can check against frustum planes if the object outside its > > > > volume.(Although I am not sure these are accessible in the current > > > > version)Also you can find if the object is in front of the camera view > > > > or > > > > behind with dot product calculation(deriving the angle between camera > > > > and > > > > your object, or just checking dot-if negative its behind the camera). > > > > > On Sat, Dec 11, 2010 at 5:11 PM, Miguel Kennedy <[email protected]> > > > wrote: > > > > > Hey guys, > > > > > > Can anyone tell me how can I determine if a mesh is currently visible > > > > > by the camera on the scene? > > > > > > Is there a property in the mesh class that tells me that? > > > > > > Thanks! > > > > > -- > > > > Michael Ivanov ,Programmer > > > > Neurotech Solutions Ltd. > > > > Flex|Air > > > |3D|Unity|www.neurotechresearch.comhttp://blog.alladvanced.nethttp:// > > >www.meetup.com/GO3D-Games-Opensource-3D/ > > > > Tel:054-4962254 > > > > [email protected] > > > > [email protected] > > > -- > > Michael Ivanov ,Programmer > > Neurotech Solutions Ltd. > > Flex|Air > > |3D|Unity|www.neurotechresearch.comhttp://blog.alladvanced.nethttp://www.meetup... > > Tel:054-4962254 > > [email protected] > > [email protected]
