The Add d to Length of  3dsolid command does exactly that.

1. Set the value of d. The command sd sets the distance to the value entered in inches.

2. Start the command and pick near the end point of any straight line edge of the 3d solid. This will increase the length of the 3d solid by the value stored in the variable d.

        In the above example the 3dsolid is 12 inches long and the value of d was set to 4 inches.

 

   

        The Rotate Till Interfere Commands rotates the last entity in the drawing a degrees till it touches or intereferes with another 3d solid (Autocad's 3dsolid entity).

1. Make sure that the 3d solid that will rotate is the last entity in the drawing.

2. Set variable a (degrees) to 4 degrees (in above example).

3. At the command prompt type rti and press enter.

        If the 3d solid to rotate is not the last entity in the drawing the command will fail. Note that the rotation occurs about the origin (0,0,0), wherever you may set that to be.

        The 3d solid rotates in steps of 4 degrees till it interferes with any other 3d solid in the drawing. At this point it creates the interference 3dsolid entity shown in red. In this example a (degrees) was set to a very high value of 4 degrees for demonstration only. This value could be as small as you need (example: a = 0.01 degrees) which would create a tiny interference 3d solid.

        Now, one undo (u + enter) will undo the creation of the 3d interference solid as well as rotate the 3d solid just back to where it is barely not touching the cylinder.

        Note: To undo the command to the beginning of the command use the command sequence: Type undo, press enter, type b (for back), and press enter.

 

 

 

                              

   The 3d Hole command creates a hole in a 3d solid with diameter d. The distance d can be set to the desired value for the hole. The hole is created by extruding a cylinder of diameter d and then subtracting it from the 3dsolid.

1. Make sure that the 3d solid is the last entity in the drawing.

2. At the command prompt type ho and press enter key.

 

       

        The 3d Setup Command creates:

        Ucs’s named: front, left, top.

        Views named: f, l, w, i, and ii.

        This command could be the first step in creating a 3d drawing. It is most useful when opening an existing 3d drawing to quickly set up the above Ucs's and Views. After adding content to the drawing the above views may not exhibit all entities in the drawing. For example, when restoring the front view some of the new entities may not be in view. Using the command again will fix this.

        Note: The view w is the same as the Top Ucs or World Ucs.