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After locating the Axis origin at a point on the picture where you have red, green, and blue axes meeting, then the red and green perspective bars are arranged along axes of the bench.
The next step is to create a palette or face on which to place lines and arc shapes of the bench components. I’ll make that palette a group so it does not interfere with the bench traceover lines and arcs.
Following this set up procedure, the modeling can begin using standard SketchUp tools for tracing over the shape and sizes of the components.
When you orbit with the mouse, the picture will temporarily disappear leaving the components that were traced over. You can get back to the picture by clicking on the Matched Photo Scene tab.
After modeling the major components, the result is a rough structure that is just a start. But this facilitates the ongoing work to complete the detail design including joints. Also, I made no initial effort to size the model. Usually it will be way oversized when importing the picture. Since sizing is a straightforward procedure using the Tape Measure, I don’t bother
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