All calculation are performed in 2D. Model is projected on table facet plane |
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 Star Upper ratio is |AB| length divided by |CD| length.
All calculation are performed in 2D. Model is projected on table facet plane |
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 Star Upper ratio is |AB| length divided by |CD| length.
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