private static void InsertEndCapSegments(IReadOnlyDictionary <RoadTopologyEdge, StraightRoadSegment> edgeSegments, RoadTemplateList roadTemplateList)
{
foreach (var edge in edgeSegments.Reverse())
{
// the end cap flag is only relevant when the edge is not connected to another edge on this end
bool hasEndCapAtStart = edge.Key.StartType.HasFlag(RoadType.EndCap) && edge.Value.Start.To == null;
bool hasEndCapAtEnd = edge.Key.EndType.HasFlag(RoadType.EndCap) && edge.Value.End.To == null;
// single edges without any connected edges can only have one end cap (at the end position), even when the flag is present at both nodes
if (hasEndCapAtEnd)
{
EndCapRoadSegment.CreateEndCap(
GetIncomingRoadData(edge.Key.End, edge.Key, edgeSegments[edge.Key]),
edge.Value.EndPosition,
edge.Key.Template,
edgeSegments,
roadTemplateList);
}
else if (hasEndCapAtStart)
{
EndCapRoadSegment.CreateEndCap(
GetIncomingRoadData(edge.Key.Start, edge.Key, edgeSegments[edge.Key]),
edge.Value.StartPosition,
edge.Key.Template,
edgeSegments,
roadTemplateList);
}
}
}
protected override Vector3 ToCorner(RoadSegmentEndPoint neighbor, bool atEnd)
{
var neighborNormal = GetNeighborNormal(neighbor, atEnd);
var toCornerDirection = neighbor.To switch
{
null => DirectionNormalNoZ, // if I have no neighbor, use my own normal
CrossingRoadSegment _ => neighborNormal, // if my neighbor is an unflexible crossing
EndCapRoadSegment _ => neighborNormal, // or end cap, use its normal
_ => Vector3.Normalize(DirectionNormalNoZ + neighborNormal) / 2, // otherwise, meet in the middle
};
// This shouldn't happen but sometimes does in broken maps (Heartland Shield for example).
if (toCornerDirection.LengthSquared() < 0.1f)
{
toCornerDirection = DirectionNormalNoZ;
}
// When two road segments meet in an angled curve, their meeting edge is tilted and thus longer than the width of the road
// -> divide by cosine
// For straight roads ending in a crossing:
// -> the angles in the crossing texture may not well match the actual angles of the incoming roads
// (especially for x-crossings, since there's only one texture for 4-road crossings which assumes 90° everywhere)
// -> the meeting edge may become quite tilted and noticeably longer than road width,
// while the road shown in the texture of the crossing always has the fixed road width
// -> to avoid visible breaks between the road segment and the crossing texture, distort the edge so its tilted seam is 'roadwidth' long
var cosine = Vector3.Dot(DirectionNormalNoZ, toCornerDirection);
var toCornerLength = neighbor.To is CrossingRoadSegment ? HalfHeight : HalfHeight / cosine;
return(toCornerDirection * toCornerLength);
}
