private static (List <Vector3>, List <Face>) CalcVerticesAndFaces(RoadNetwork roadNet)
{
var vertices = new List <Vector3>();
var faces = new List <Face>();
RoadSegmentMeshInfo[] segmentMeshInfos = new RoadSegmentMeshInfo[roadNet.SegmentCount];
for (int i = 0; i < roadNet.VertCount; ++i)
{
// Construct incoming road edge descriptors
RoadVertexView roadVert = roadNet.GetVertex(i);
List <int> connSegIndices = roadVert.Data.ConnectedSegmentIndices; // Assumed connected segments in clockwise order
var incRoadEdges = new RoadSegmentEdges[connSegIndices.Count];
var roadMeshEndInfos = new RoadSegmentMeshEndInfo[connSegIndices.Count];
for (int j = 0; j < connSegIndices.Count; ++j)
{
// Extract road segment mesh end info to fill out
// This is used to assign the vertices we create in this loop to the correct road segment, at the correct end.
int curSegmentIndex = connSegIndices[j];
ref RoadSegmentMeshInfo curSegmentMeshInfo = ref segmentMeshInfos[curSegmentIndex];
if (curSegmentMeshInfo == null)
{
curSegmentMeshInfo = new RoadSegmentMeshInfo();
}
RoadSegmentView curSegment = roadNet.GetSegment(curSegmentIndex);
ref RoadSegmentMeshEndInfo curSegMeshEndInfo = ref ((curSegment.StartVertex.Index != i) ? ref curSegmentMeshInfo.startVertIndices : ref curSegmentMeshInfo.endVertIndices);
curSegMeshEndInfo = new RoadSegmentMeshEndInfo();
roadMeshEndInfos[j] = curSegMeshEndInfo;
// Get adjacent vertex on this road segment
int adjVertIdx = curSegment.StartVertex.Index != i ? curSegment.StartVertex.Index : curSegment.EndVertex.Index;
RoadVertexView adjRoadVert = roadNet.GetVertex(adjVertIdx);
// Construct the incoming left and right road edge descriptors
Vector2 incDir = (roadVert.Position - adjRoadVert.Position).normalized;
Vector2 rot90Dir = new Vector2(-incDir.y, incDir.x); // Rotated 90 degrees counter clockwise
Vector2 leftOffset = rot90Dir * curSegment.HalfWidth;
Vector2 rightOffset = -rot90Dir * curSegment.HalfWidth;
RoadSegmentEdges roadSegmentEdges = new RoadSegmentEdges()
{
left = new Line()
{
start = adjRoadVert.Position + leftOffset,
end = roadVert.Position + leftOffset
},
right = new Line()
{
start = adjRoadVert.Position + rightOffset,
end = roadVert.Position + rightOffset
}
};
// Add incoming edges to array
incRoadEdges[j] = roadSegmentEdges;
}