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Revision: 26197
at April 20, 2010 11:17 by mattkenefick
Initial Code 
var tempMatrix:Matrix3D = Matrix3D.inverse( new Matrix3D([0,0,0]) );
			
var vectorA:Number3D 	= new Number3D( 0,0,1 );
Matrix3D.multiplyVector( *OBJECT*.getPlane().transform, vectorA );
vectorA.normalize();

var vectorB:Number3D = new Number3D( 0,0,1 );
tempMatrix = Matrix3D.clone( *CLICKED-OBJECT*.transform );
Matrix3D.multiplyVector( tempMatrix, vectorB );
vectorB.normalize();

var angle:Number = Math.acos( Number3D.dot(vectorB, vectorA) / (vectorA.modulo*vectorB.modulo) )*180/Math.PI;

trace( angle );
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                                        Initial Description
                                        

                                    

                                    
If you have multiple objects orbiting a 3D object and you want to determine the angle of a specific object, this will help you determine what rotationX you need to set your camera to if you want to be directly behind it. 

Note: It works completely in 3d space. So if your Y, Z, X are not inversed or directly related to your comparison object, the angle will be a little off.

                                

                                                            

                                    

                                        

                                        Initial Title
                                        

                                    

                                    
Get angle from object in 3D space

                                

                                                            

                                    

                                        

                                        Initial Tags
                                        

                                    

                                    

                                

                                                            

                                    

                                        

                                        Initial Language
                                        

                                    

                                    
ActionScript 3