PolyInfo Struct Reference | C4D R23.110 C++ SDK - 中文文档编制,帮助,手册,教程

PolyInfo Struct Reference

#include <c4d_baseobject.h>

详细描述

Holds polygon neighboring information.

另请参阅: Neighbor::GetPolyInfo

范例：
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.

注意: 若 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.

Opolygon

#define Opolygon

Polygon - PolygonObject.

定义： ge_prepass.h:975

CPolygon::b

Int32 b

Index of the second point in the polygon.

定义： c4d_baseobject.h:46

PointObject::GetPointCount

Int32 GetPointCount(void) const

定义： c4d_baseobject.h:1439

PolygonObject::GetPolygonR