Download the .zip file below and open basketball.prt.
Insert -> Offset/Scale -> Offset Surface. Make sure “single face” is selected in the selection filter, and choose any one of the orange faces.
Enter a value of 0.046875 in, and make sure that the direction vector is pointing toward the center of the basketball. The reason for using this value is that we are going to pattern this offset surface with spheres of radius 0.0625 in (1/16th in), and we would like for only the top eighth of the sphere to protrude through the surface of the basketball.
From the assembly navigator, right-click the surface you just created, and select “Show only,” to simplify the work environment.
Insert -> Curve from Curves -> Offset in Face.
Set “Connected Curves” as the selection filter, and choose the boundary of the offset surface created in step 3. Enter a value of 0.0625 in the Section1:Offset1 box. Select the offset surface as the “Face or Plane,” as shown below:
Next you will fill up the surface with evenly spaced offset copies of the curve just created. Again Insert-> Curve from Curves -> Offset in Face. This time select the curve just created, and enter an offset distance of 0.09375. Select the offset surface as “Face or Plane,” and make sure that the offset curve appears on the inside of the first curve.
Select “Add New Set,” and again select the first offset curve. Enter an offset distance of 2*0.09375, and make sure the offset vector is pointing inward.
Repeat step 8 with an offset distance of 3*0.09375. For the nth step, the offset distance is n*0.09375. Continue until the surface is evenly foliated, as the picture below suggests. Once you have finished, select OK.
Now you are ready to pattern the offset face with spheres of radius 0.0625. Insert -> Design Feature -> Sphere. Set the diameter to 0.125, and enter the point dialog to specify the location. Under “Type,” select “End Point” and an arc on the first offset curve, then “OK.” Back in the Sphere dialog box, select Apply, and repeat this process for each of the offset curves.
Once you have a sphere on each offset curve, use Insert -> Associative Copy -> Instance Geometry, and create copies along each path. Start with 250-300 on the longest path, and decrease the total by 10 for each subsequent offset path inward. The result will be a fully patterned face, as below:
You can now show the rest of the basketball to see the effect: pretty convincing!