tapered extrusion

[Arrakis]

I have a star that ive extruded then I want one end to taper. How would I do this? Someone said expand it then select the points at one end but there only seems to the option to expand appearance and then theres no points to select after I do that, just a bounding box.

[Monika Gause]

I'm not sure what kind of object you are talking about, cann you please show a screenshot?

If this is 3D, please tell us exactly which methods you applied.

[Arrakis]

Yes 3D.  Created star shape extruded with 3D. I want it to taper off into the distance like the image attached. 

[Ton Frederiks]

Both the new and the classic 3D effects have a perspective option to use with a large extrusion.

[Arrakis]

Yes tried that but doesn't do what I want

[Ton Frederiks]

If you want to do it manually, you could use the Classic 3D and expand appearance.

The new 3D and Materials has an option in the latest AI update to expand as Wireframes (to be found at the bottom of the Object section).

[Anna Lander]

You can use perspective during creating your 3D as Ton says or create a Blend object with a Smooth Color option from large to small stars. The last way allows you to control the extrusion depth easily and change the sizes of starting and final objects at any moment.

[kphotopage]

Here I took a totally different approach. I did it manually.

Star Tool, Place a star. Free Transform.
Turn on Smart Guides. Snap to point
Line Tool, draw some lines.
Direct Select each end point, move to star.
Bottom end points, Object>Path>Average. (This gives you the Vanishing Point.)

Live Paint. Fills. Recolor as you wish.
Expand Live Paint, Delete strokes. Select same color and Pathfinder>Unite.
Perhaps play with gradients.

K