cameraPositionWithMatrix4Example.js

// Get a Matrix4 which contains position, rotation and scale info for the cube
var matrix = cube.matrix;

// Move the matrix behind and above the cube a bit
matrix.translate(Vector3(0, 400, 400));

// Make the matrix's rotation point it at the cube's position
matrix.lookAt(matrix.position, cube.up, matrix.up);

// Set the camera's position and rotation from the matrix
camera.position.getPositionFromMatrix(matrix);
camera.position.getRotationFromMatrix(matrix);