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Tutorial on modeling lamp shade in Creo Elements/Pro aka Pro/Engineer Wildfire.
Here is the tutorial.
Step 1
Sketch >> Top plane.
Step 2
Draw a circle.
Step 3
Extrude it.
Step 4
Sketch >> Top plane.
Step 5
Draw a circle.
Step 6
Extrude it with remove material up to next surface.
Step 7
While selecting the cut feature click Edit >> Pattern.
Step 8
Pattern it about axis at 360º 8 times.
Step 9
Front Plane >> Sketch.
Step 10
Draw a spline.
Step 11
Exit the sketch. Goto Insert >> Warp.
Step 12
Select the body.
Step 13
Click Spine tool.
Step 14
Click Warp radially along axis.
Step 15
Now carefully transform the body by dragging the control points.
Step 16
Click List. Here are all the warp operations done.
Step 17
Click Warp.
Step 18
Center type.
Step 19
Now while pressing alt+shift drag the control point about the edge and input the value of 65.
Step 20
Similarily about the other edge.
Step 21
As we can see there are warp operation in list in the order.
Step 22
Click OK and the feature is generated.
Step 23
Shell the body while removing the face.
Step 24
Sketch >> Top plane.
Step 25
Draw a circle.
Step 26
Extrude cut it up to next surface.
Step 27
Well if we apply some more operations like fillet and twisting under warp our result will be like this.