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The perspective window’s grid is used for object creation and mesh editing. It can be aligned with any of the walls of the set: floor, back, ceiling, etc. A move-grid mode translates the grid, while maintaining the same orientation, to give you a grid 1 meter above the floor, say.
A shared custom grid position can be matched to the location of several vertices or trackers using the right-click|Grid|To Facets/Verts/Trackers menu item. If 3 or more trackers (or vertices) are selected, the grid is moved into the plane defined by the best- fitting approximation to them (ignoring outliers). If two are selected, the grid is rotated to align the side-to-side axis along the two. If one is selected, the grid slides to put that tracker at the origin.
To take advantage of this, you should first select 3 or more vertices or trackers, and align once to set the overall plane. Then select only one of them, and align again to set it to be the origin. Select two of them, and align again to spin the plane so the X axis
is parallel to the two. (You can do it in the order 3+,1,2 or 3+, 2, 1 ... the 3+ should always be first!)
You can easily create an object on the plane defined by any 3 (or more) trackers by selecting them, aligning the grid to the trackers, then creating the object, which will be on the grid.
You can toggle the display of the grid using the Grid/Show Grid menu item, or the ‘G’ key.
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