PolyInfo Struct Reference

#include <c4d_baseobject.h>

Detailed Description

Holds polygon neighboring information.

See also

Neighbor::GetPolyInfo

Example:
The following code browses through all available edges:

if (pObj->GetType() != Opolygon)
  return;
 
PolygonObject* pPolyObj = ToPoly(pObj);
if (pPolyObj == nullptr)
  return;
 
Neighbor neighbor;
const CPolygon* pPolyR = pPolyObj->GetPolygonR();
Int32 pointCount = pPolyObj->GetPointCount();
Int32 polyCount = pPolyObj->GetPolygonCount();
 
if (pPolyR == nullptr)
  return;
 
if (!neighbor.Init(pointCount, pPolyR, polyCount, nullptr))
  return;
 
for (Int32 polyIdx = 0; polyIdx < polyCount; polyIdx++)
{
  PolyInfo* polyInfo = neighbor.GetPolyInfo(polyIdx);
 
  for (Int32 edgeIdx = 0; edgeIdx < 4; edgeIdx++) // Test all 4 edges of a polygon
  {
    // Only proceed if the edge has not already been processed and edge really exists
    // For triangles edge 2 from c.......d does not exist as c == d
    // One can also skip the edgeIdx == 2 && pPolyR[polyIdx].c == pPolyR[polyIdx].d test as polyInfo->mark[2] is always true for triangles
    if (polyInfo->mark[edgeIdx] || (edgeIdx == 2 && pPolyR[polyIdx].c == pPolyR[polyIdx].d))
      continue;
 
    Int32 edgeA = -1, edgeB = -1;
 
    switch (edgeIdx)
    {
      case 0: edgeA = pPolyR[polyIdx].a; edgeB = pPolyR[polyIdx].b; break;
      case 1: edgeA = pPolyR[polyIdx].b; edgeB = pPolyR[polyIdx].c; break;
      case 2: edgeA = pPolyR[polyIdx].c; edgeB = pPolyR[polyIdx].d; break;
      case 3: edgeA = pPolyR[polyIdx].d; edgeB = pPolyR[polyIdx].a; break;
    }
 
    GePrint("Triangle " + String::IntToString(polyIdx));
    GePrint("Edge" + String::IntToString(edgeA) + " ------------ " + String::IntToString(edgeB));
 
    // Do something with the edge a.......b
  }
}

Public Attributes
Int32	face [4]
Int32	edge [4]
Char	mark [4]

Member Data Documentation

face

Int32 face[4]

The neighboring polygons.

Note

If NOTOK it then means there is no neighbor.

edge

Int32 edge[4]

The edges of the polygon.

mark

Char mark[4]

false if that polygon "generated" an edge.
For example think of 2 polygons that share an edge, one has set mark = false for the edge because it was the first and "built" the edge and the other(s) will set mark = true as no new edge had to be generated.