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Drag boxes to move; empty space to pan. Alt/Option rotates or orbits.VP labels follow the selected box · arrows point off-screen
02
Read the edge families
The reference turns a corner toward you: two edge families converge on the horizon; verticals stay parallel. Rotate another box and its vanishing points change. Moving or resizing it preserves them.
ON PAPER
Draw the nearest corner. Follow each edge family toward its vanishing point. Compare the lengths you see, not the lengths you know.