I will be using:
123D Catch, which is software made by Autodesk that you can download as an app.
Meshmixer, another Autodesk program that is used to clean up my catch.
123D Make, also free software by Autodesk.
Step 1: Do the Catch
When doing the catch you are to take approx. 40 pictures of your thing, in this case my pineapple. You can do this in any way. Either circling around your object, or taking pictures in random order, but try to get at least a couple pictures of each side and of all undercuts that your object might have. This might take a couple tries. Take the pictures using the 123DCatch app. It seems to work better on ipads than on iphones, but it is supposed to work on both.
Upload your pictures and export it up on to the community. Then transfer to you computer.