A forming question
Teach the glass where to fold.
Traditional forming gives the sheet one broad instruction: heat and let gravity shape it. This brief makes the engineering contrast easier to inspect without filling in the missing method.
Compare the forming lens
traditional baseline
Heat, soften, sag
The supplied passage describes the familiar baseline: the entire sheet softens and gravity pulls it into a broad curve.
WHOLE SHEET / BROAD CURVE
Evidence boundary: the excerpt ends before naming the proposed localized process or its equipment.