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Using the Assemble Mesh Mouse Mode
You can manually triangulate a mesh using the Assemble Mesh mode of the perspective window. Obviously that takes some more time, at a bit over one click per facet, but it goes quickly. It allows the very specific control necessary for objects such as detailed building models, or for stitching together separately-triangulated meshes.
Tip : You may want to use Assemble Mesh Mode when the vertices form a volume, and you need to work on the front half of a head, say, where triangulation will produce unuseful results from all vertices (unless you use a clipping plane).
To use Assemble Mesh mode, go to the perspective window and select it from the Mesh Operations submenu of the right-click menu. Do not use the Convert to Mesh item on any trackers. (Assemble Meshes does also work directly on vertices, such as an imported Lidar scan.)
Instead, begin clicking on the three trackers you want to form the first facet. As you click on the third, the facet will be created. Click on a fourth tracker, and a new facet will be created from two of the prior three and the new one in a reasonably intelligent fashion. As you click on each additional tracker, a new facet will be created.
You can hit Undo if the triangle created isn't the one you want. To get the triangle you want, click on the vertex you do not want to deselect it; with only two vertices then selected, clicking on another vertex will create a facet with it and the two selected.
To start a new triangle in a different location, hold down the control key as you click a tracker: the previously selected vertices will be deselected, leaving only the new vertex selected. Clicking two more trackers will produce the first new facet.
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