# Crane Assembly

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With the Crane fully rigged, the previous mining scene with the completed train is again opened and the crane is imported, duplicated and positioned to finish off the mining scene and the tutorial.

Users can jump ahead to a specific section by using the Chapter selection widget on the right side of the player or by directly clicking any of the Chapter Title links below.

Tab | Time | Chapter | Description
1 | 00:00 | Start | Rich imports and places the Crane into the final completed scene.
| 04:13 | Total Video Time |

Frequently Asked Questions--

Q.) He changed the rotation order of the control item, what does that do?

> A.) Think of the 3 degrees of rotation, X Y and Z as rings parented to one another. If Y is parented to X and Z is parented to Y and you rotate X… both Y and Z will go along with it. If you rotate Z, Y and X are unaffected since its the last one in the order. So by allowing the user to change the order of rotation they can affect how the rotation is evaluated to suit their needs, and potentially avoid issues with Gimbal Lock.

Q.) OK, So what is Gimbal Lock?

> A.) Gimbal Lock is the loss of the ability to rotate an axis as it get too close to its parents rotation value. Changing the evaluation order can sometimes avoid the problem all together, but that is dependant on the eventual animation. Like he said, any rig can be broken.

Resources--

Links to the modo in-line help system
--None--

Links to other pages in this training
--None--

File--

Links to the modo scenes used in the video
(click to open in modo)
File: AssemCrane_01_Assembly_01.lxo
File: AssemCrane_01_Assembly_02.lxo

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