1. Star Upper ratio calculation on first star facet example highlighted with pink:
1.1 Draw a line a through star facet edge belongs to table. Line will separate plane into half-planes β and δ:
1.2 Find most distant point (call it B) on star facet from line a. A is point, where perpendicular from point B is crossing line a:
1.3 Find most distant point on girdle (call it D) from line a, point should belong to β half-plane. C is point, where perpendicular from point D is crossing line a:
1.4 Start Upper ratio is |AB| length divided by |CD| length.
2. "Star Upper ratio" calculation on second star facet example highlighted with pink:
2.1 Draw a line a through star facet edge belongs to table. Line will separate plane into half-planes β and δ:
2.2 Find most distant point (call it B) on star facet from line a. A is point, where perpendicular from point B is crossing line a:
2.3 Find most distant point on girdle (call it D) from line a, point should belong to β half-plane. C is point, where perpendicular from point D is crossing line a:
2.4 Start Upper ratio is |AB| length divided by |CD| length.
3. Notes
- If you have any question, please ask it in comments or send e-mail to developer.
- If you find mistake. please describe it in comments or send e-mail to developer.