Forming field
The field could not be formed in this browser.
The shadow exhibit needs a canvas to draw the three occupancy solids.Same projection. Different bodies.
Canonical occupancy
Locked shadow lamina
Three different bodies are subsets of the same extruded cylinder S × ℝ. S is a rounded cross with a circular hub, defined by a shared signed-distance mask. Canonical projection is orthographic along −Z, up +Y. Occupancy of a pixel is the binary test that the ray through that pixel meets any occupied z-interval. By construction the three masks agree exactly on any raster of S. Off-axis views are inspection; the invariant applies only to that named projection. Paper and UV change presentation, not geometry. Not a manufacturable part. The field is a 64² column tessellation of those intervals, not a second geometry. Seams are the raster of S.