The benefits of the technique used in this tutorial are efficiency & speed as well as the relativity gentle learning curve for those without experience in CAD (computer assisted design).
You will need:
-iPhone or iPad
-123D Catch from the app store (free)
-Meshmixer computer program (download for free here)
-123D Design (download for free here)
-Keyshot (Trial Version here)
-Photoshop (for optional image enhancements, trial available here)
Step 1: Preparing the Catch
There are two approaches to the catch, with an iphone/ipad or with a digital camera & computer. In my experience I have found the iphone/ipad method to be the fastest & most reliable so that is the method I will explain If you would like to know the other method (which is actually very similar) visit: http://www.123dapp.com/catch/learn
For the iphone/ipad approach download the (free) 123D Catch app from the app store 123D Catch App. Then create an account & log in.
You (person being catched) should be standing in a comfortable position with enough room around them for the "assistant" (person assisting taking the catch) to walk around them taking photos keeping the catchee's body within the frame.
The environment should be as evenly lit as possible but does not require studio quality backdrops or lights.
The catchee should stand as still as possible and stare directly forwards with eyes closed.
Step 2: Catching
Taking a photo by taping the camera icon the assistant walks around the catchee taking photos of the catchee from the chest every keeping the catchee's body within the frame. The aim would be to get 10-15 photos for every lap around the person and to have 3 laps; one from the floor looking up , one at the waist-chest level looking strait on, and one above looking downwards (as shown in the diagram).
Once the catcher has completed the 3 laps and the image count is between 25-35 tap the "Review" button in the bottom right corner. Then tap Finish Capture button in the top right hand side.
Makerbot has some good tips on catching here. Tinkernut also has a very nice you tube clip of the whole process Weekend Hacker: Turn Photos Into 3D Models
Step 3: Publishing the Catch
Tap the export icon and select "Share to Community".
On your computer open your web browser and navigate to the 123Dapps site & sign in.
Navigate to "My corner tab" and find the model you just shared, click it and on the right hand side you will see a download section. Download the .zip file under "Mesh Package File File".
Step 4: MeshMixer
Open MeshMixer and go to File > Import and find where you downloaded the .zip file in the last step. Once located select & open the .obj file.
Follow Makerbots tutorial on cleaning up a model here using the Inspector & Autofix Tools. You can also use the "VolBrush" tools to create a spoon shape by pulling a stem out, expanding it into a bubble then pushing it into a concave form. For a more in-depth explanation of this refer to MeshMixers tutorial page.
Keep Meshmixer Open and move onto the next step.
Step 5: Making the Speaker Cone
Then using the Pyramid Tool create a pyramid (size is irrelevant for now), the using the cut off tool cut the top of the cone off. Then use the shell tool to shell it to a disired thickness (make sure you select the bottom face to remove when shelling). Export file to your corner in 123D. Then download the zip file so you can open it in Mesh Mixer.
Go back to your MeshMixer window and import the file, when the dialog box asking you if you would like to open a new model or append to the existing choose "append".
Click on the cone and hit "s" (to open select tool) and then "cntr + a" (to select all) the choose edit transform surfaces to move scale and rotate the cone till it sits as shown.
For a more in-depth explanation of this refer to MeshMixers tutorial page.
Once done select File > Export obj.
Step 6: KeyShot Rendering and Photoshop Finishing
Import your obj file.
Follow the Keyshot Basics - Getting Started Tutorial
Apply material to your model by dragging from the materials dialog.
Choose a scene in the Scene dialog.
Hit render and choose the render settings you desire, generally the larges frame size in the presets drop-down is sufficient quality at a fast speed.
If you want to apply touch-ups to your render take the image file into Photoshop and do so. I choose to photo-merge two different materials to make a copper vase and marble twigs. I did this by rendering on shot with the gold material applied, then without moving or rotating the object or the scene I changed the material to porcelain. Then I overlayed the two in Photoshop gold layer ontop and masked out the vase section of the porcelain layer. I Photoshoped in a speaker and cable.