facetIndex0 Method

Given a valid facet index, return the index at which its face loop starts in the index arrays.

• A "face loop" is a contiguous block of indices into the parallel polyface index arrays.
• Each of these indices represents an edge of a facet, thus it is sometimes called an "edgeIndex".
• Together with facetIndex1, this method can be used to iterate the face loop of the facet with index iFacet as follows:

  for (let iEdge = this.facetIndex0(iFacet); iEdge < this.facetIndex1(iFacet); iEdge++) {
  const iPoint = this.data.pointIndex[iEdge];
  const p = this.data.point[iPoint];
  // ... process the edge of this facet starting at point p
  }
  

facetIndex0(facetIndex: number): number

Returns - number

Defined in

• polyface/Polyface.ts Line 620