For creating objects from the keyboard, use Keyboard Entry rollout in Create Panel. This rollout is closed by default. Click the Keyboard Entry rollout to open it. Give desired values of different parameters of an Object, by highlighting present value using mouse and give New Value from the Keyboard. Here X, Y, Z are the coordinates of center point of object, to be created. Click on Create button, the object appears in the active viewport. Once created, a new object is unaffected by the numeric fields in the Keyboard Entry rollout. Now we can adjust parameter values on the Parameters rollout, either immediately after creation or on the Modify panel.

Each standard primitive has the following parameters on its Keyboard Entry rollout.

Primitive	Parameters	XYZ point
Box	Length, Width, Height	Center of base
Cone	Radius 1, Radius 2, Height	Center of base
Sphere	Radius	Center
GeoSphere	Radius	Center
Cylinder	Radius, Height	Center of base
Tube	Radius 1, Radius 2, Height	Center of base
Torus	Radius 1, Radius 2	Center
Pyramid	Width, Depth, Height	Center of base
Teapot	Radius	Center of base
Plane	Length, Width	Center