¶ Projective Transformation Model (1)
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RBF Definitions
“I am going to give you a mental model of what I did in developing my method of projection. This is really a ‘topological transformation’ rather than a ‘projection’ since it isn’t a shadowgram. I am going to take a thin tempered steel band and I am going to mark it with sub-modules, with increments like an engineer’s scale. If I bend the band, the modules will all stay in their same original uniform lengths. In a bent condition, or in a flat condition the modules will all read the same. Now I am going to punch holes vertically through both the end module marks of the band and I’m going to take two more such bands each marked with the same modules and I am going to overlap their hole-punched ends, and I’m going to put a round rod through the holes. The rods going through each of the corners of the steel band edged triangles make little swivels. The rods go through the bands vertically and perpendicular to the plane of the triangle formed by the steel bands. If I take hold of the bottom ends of two such rods that go through the holes at the end of one of the steel bands and pull them towards each other, I make the steel band bend. Now I take hold of the bottom ends of all three perpendicular steel rods and pull them towards one another.”
¶ Citations
- RBF, Univ. of Rhode Island, 26m Aug. '66, p. 197.
