Camera Rig for 123D Catch

123D Catch is a new application and service from Autodesk that turns a series of photographs into a 3D model of an object or space.

The rig described here helps you structure the photos for best results. It lets you spin the camera around the object at a constant height and distance, while the object stays still. You can easily move the camera up and down to get top and bottom angles.

For this project, you will need:

Tools

3D printer
Saw
Electric screwdriver

Wood materials

3x 36" long 1" dia dowel
1x 12" long x 3/4" thick x 2" wide plank
1x 8" x 8" x 3/4" board
1x 6" x 6" x 3/4" board

Hardware

38x #8 3/4" construction screws
4x #8 3/4" hex bolt
1x #8 1" hex bolt
5x #8 wing nuts (6x optional)
2x #8 lock washers (3x optional)
1x 1/4" x 3/4" thumbscrew
1x 1/4 washer
2x casters (the base should not exceed 2" in depth)

You will need a 3D printer, such as a Makerbot, or access to one via a 3D printing bureau such as Shapeways or Ponoko. You will need to print:

1x l-brace
1x 3-brace
2x 2-brace
2x 1-brace
1x collar
1x flange
3x shaft collar
1x camera ring
1x camera platform
1x extension arm (optional)

Download the files and print them yourself, or send them to a service. They are also hosted on Thingiverse.

Take one piece of dowel, and cut it into 2x 4" pieces, and 2x 8" pieces

Mark center of your 12" plank. Attach the L-brace to plank with 4x #8 screws.

Place an 8" dowel in the middle of the 3-brace. Insert the 8" dowel into the top of the l-brace. Insert a 4" length of dowel on to the branches of the 3-brace. Fit a 1-brace onto the free end of the 4" dowels

Bring the 1-braces down to the plank by sliding the 3-brace down the longer length of dowel. Make sure the 4" dowels are tightly seated, into the 3-brace on one end, and a 1-brace on the other end.

Attach the 1-braces to the plank using 8x #8 screws. Secure the 4" dowels to the 1-brace and 3-brace by using 4x #8 screws (2 on each side).

Do NOT secure the 8" dowel yet. Its destiny lies elsewhere. 

Attach the casters to the bottom of the plank using 8X #8 screws. Try not to hit the screws that hold the 1-brace in place from the other side.

Put a 2-brace on each end of one piece of 8" dowel (the one that is not in the base). Do not secure it with a screw yet.

Assemble the shaft collars by putting a #8 hex bolt through one side, and secure it with a #8 wing nut (do not tighten). The head of the hex bolt goes on the side with a matching hexagonal recess.

Attach the collar piece to the end of one of the 36" dowels. Put a shaft collar on the dowel with the collar, and slide it down towards the center

Attach the flange to the 8" x 8" board using 4x #8 screws. Attach the other flange to the 6" x 6" board using 4x #8 screws

Slide one end of the 8" dowel with the 2-braces over the other 8" dowel (in the 3-brace). Put a shaft collar on the dowel with the collar, and slide it down towards the center. Fit the long dowel with the collar through the other 2-brace and then through the bottom of the l-brace. 

Ensure the 2-braces are lined up and secure them with 2x #8 screw

Remove the 8" dowel from the 3-brace and place it in the flange, secure it with 1x #8 screw.

Put a shaft collar over the 8" dowel in the flange.

Put the collar on the end of the long dowel over the short dowel in the flange.

Adjust the height of the shaft collar so that the long dowel is level.

Place the other long dowel in the top of the 3-brace, threading it through the loose 2-brace. The main structure should be almost completely assembled.

Place the small platform (with flange) over the short dowel that is attached to the bottom plate

Place a shaft collar on the outside of the long horizontal dowel. Tighten it down to secure the boom. Move the shaft collar that you placed on the boom earlier out, to secure the lower brace.

Assemble the camera adapter by putting a #8 hex bolt through the two tabs, and secure it with a wing nut.

Attach the camera platform to the camera adapter with a "1 #8 hex bolt, placing a lock washer between the adapter ring and the platform. Secure with a wing nut.

Put a 1/4" thumbscrew in the bottom of the camera platform (the side with the raised ring) and tighten it.

Put the camera adapter ring over the main pole (vertical dowel) and secure it by tightening the wing nut.

Congratulations! You have finished assembling the rig. Test it out by pushing the base back and forth, it should orbit smoothly around the platform.

Attach your camera to the camera platform by screwing the 1/4" thumbscrew into the tripod fixture in the bottom of the camera, securing it to the camera platform.

Loosen the wing nut that holds the platform and camera adapter ring, and adjust the camera until it is pointed right at the platform.

Place your target object on the platform, and take 30 or so evenly spaced pictures. 

Loosen the wing nut on the camera adapter, and slide the whole camera mount up. Take another 20-30 pictures looking down at the platform.

Repeat, this time moving the camera mount down, so you can take pictures looking up at the platform.

You can adjust the vertical pole to move it farther or closer to the object, by loosening the two shaft collars and sliding the whole assembly on the boom.