Throwcast Manual
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Chapter 7The device library

7.2 The Device tab

Device mode replaces both side panels: the left becomes the library of definitions this project owns, the right becomes the editor for the selected one.

The Device tab
Figure 7.2 The Device tab. Left: projectors, devices and lenses this project owns, each row showing how many are in the scene. Centre: a 3D preview with the socket panel laid out on the body. Right: the definition editor.

The editor covers the body (width, height, depth, and whether the machine wears a raised ultra-short-throw head), the optics (lumens, panel, native ratio), the image formats the panel can be driven in, lens mounting (fixed or swappable, and which lenses are compatible), and the ports.

A lens is authored as a casting: which of four shapes it is — a straight barrel, an elbow that turns the light 90°, a rear fold that throws back over the cabinet, or an ultra-short-throw — and how long each of its sections is. Where the beam starts and which way it leaves (§4.4) is derived from that, rather than typed as a set of offsets: say what the part is and the light leaves where the part says it does. Where it bolts on is the machine’s figure, not the lens’s — one Lens mount R / U on the body, so a lens that fits two chassis does not carry one of them around.

Why formats matter

A projector does not have “an aspect ratio” — it has a panel and a list of formats it can drive it in, and the throw ratio changes with the choice. Driving 4:3 on a 16:10 panel uses only part of the panel’s width, so the same distance makes a narrower image and the ratio rises by exactly panel ÷ chosen. Vendors tabulate a separate throw-ratio column per format for this reason, and so does Throwcast.