#### Position and move objects

 Unit of distance Since ThreeDimSim does not make assumptions about the unit of distance used in your script, you have to assume the unit size. In the previous example, the box was moved 5 units, you have to assume if this means 5 meters, 5 inches or 5 micrometers, or anything else. The only prerequisite is that all units used in the script form a consistent set. For example, as velocity is expressed in distance units per time units, the choice you make for the distance unit has to be  reflected in the velocity unit. Move As demonstrated in the previous paragraph, an object can be positioned by using the method move. The move(x,y,z) method translates an object over the specified vector [x,y,z]. The vector is given by the 3 arguments x,y,z. Many methods have alternate forms. In this case, the move method also accepts one argument containing the translation vector: move(p). You can define a vector by enclosing its 3 elements by braces: {x, y, z}. Example: ```// move the object 'a' 10 units in x-, 20 in y- //and 30 in z- direction a.move(10,20,30);``` ```// define a vector p var p = {10,20, 30}; // translate the object 'a' over vector 'p' a.move(p); ``` ```// create the vector on the fly a.move ( { 10,20,30} ); ``` Rotate The orientation of an object can be changed by the rotate method. Example: ```// express angles in degrees factory.useDegrees = true; // rotate around y-axis with 90 degrees a.rotate(0, 90, 0);``` In this example object 'a' is rotated around the y-axis with 90 degrees. The factory property useDegrees was set to true, meaning that after this property is set, all arguments concerning angles are expressed in degrees. This setting will continue to hold until the 'useDegrees' property is changed. When useDegrees is set false, radians are expected. Example: ```// express angles in radians factory.useDegrees = false; // rotate around x-axis with .2 radians a.rotate(.2,0,0); ``` Another way to change the orientation is the method rotateAround. This method will rotate the object around another one, over a specified angle. To do so, it uses the current position and orientation of the object to define the plane in which the object will be rotated.  Example: ```// create a cylinder var a = Cylinder(10,10,20); // create a cube with size 10 at position [30,0,0] var b = Box({10,10,10}, {30,0,0}); // rotate the box around the cylinder with 45 degrees b.rotateAround(a, 45); ```