private void TriangulateAdjacentToRiver(HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e)
{
if (cell.HasRoads)
{
TriangulateRoadAdjacentToRiver(direction, cell, center, e);
}
if (cell.HasRiverThroughEdge(direction.Next()))
{
if (cell.HasRiverThroughEdge(direction.Previous()))
{
center += HexMetrics.GetSolidEdgeMiddle(direction) *
(HexMetrics.innerToOuter * 0.5f);
}
else if (cell.HasRiverThroughEdge(direction.Previous2()))
{
center += HexMetrics.GetFirstSolidCorner(direction) * 0.25f;
}
}
else if (cell.HasRiverThroughEdge(direction.Previous()) && cell.HasRiverThroughEdge(direction.Next2()))
{
center += HexMetrics.GetSecondSolidCorner(direction) * 0.25f;
}
EdgeVertices m = new EdgeVertices(
Vector3.Lerp(center, e.v1, 0.5f),
Vector3.Lerp(center, e.v5, 0.5f)
);
TriangulateEdgeStrip(m, cell.Color, e, cell.Color);
TriangulateEdgeFan(center, m, cell.Color);
}
private void TriangulateWithRiver(HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e)
{
Vector3 centerL, centerR;
if (cell.HasRiverThroughEdge(direction.Opposite()))
{
centerL = center + HexMetrics.GetFirstSolidCorner(direction.Previous()) * 0.25f;
centerR = center + HexMetrics.GetSecondSolidCorner(direction.Next()) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next()))
{
centerL = center;
centerR = Vector3.Lerp(center, e.v5, 2f / 3f);
}
else if (cell.HasRiverThroughEdge(direction.Previous()))
{
centerL = Vector3.Lerp(center, e.v1, 2f / 3f);
centerR = center;
}
else if (cell.HasRiverThroughEdge(direction.Next2()))
{
centerL = center;
centerR = center + HexMetrics.GetSolidEdgeMiddle(direction.Next()) * (0.5f * HexMetrics.innerToOuter);
}
else
{
centerL = center + HexMetrics.GetSolidEdgeMiddle(direction.Previous()) * (0.5f * HexMetrics.innerToOuter);
centerR = center;
}
center = Vector3.Lerp(centerL, centerR, 0.5f);
// Use alternative interpolation otherwise the river will appear pinched instead of straight
EdgeVertices m = new EdgeVertices(
Vector3.Lerp(centerL, e.v1, 0.5f),
Vector3.Lerp(centerR, e.v5, 0.5f),
1f / 6f
);
m.v3.y = center.y = e.v3.y;
TriangulateEdgeStrip(m, cell.Color, e, cell.Color);
terrain.AddTriangle(centerL, m.v1, m.v2);
terrain.AddTriangleColor(cell.Color);
terrain.AddQuad(centerL, center, m.v2, m.v3);
terrain.AddQuadColor(cell.Color);
terrain.AddQuad(center, centerR, m.v3, m.v4);
terrain.AddQuadColor(cell.Color);
terrain.AddTriangle(centerR, m.v4, m.v5);
terrain.AddTriangleColor(cell.Color);
if (!cell.IsUnderwater)
{
bool reversed = cell.IncomingRiver == direction;
TriangulateRiverQuad(centerL, centerR, m.v2, m.v4, cell.RiverSurfaceY, 0.4f, reversed);
TriangulateRiverQuad(m.v2, m.v4, e.v2, e.v4, cell.RiverSurfaceY, 0.6f, reversed);
}
}
private void TriangulateRoadAdjacentToRiver(HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e)
{
bool hasRoadThroughEdge = cell.HasRoadThroughEdge(direction);
bool previousHasRiver = cell.HasRiverThroughEdge(direction.Previous());
bool nextHasRiver = cell.HasRiverThroughEdge(direction.Next());
Vector2 interpolators = GetRoadInterpolators(direction, cell);
Vector3 roadCenter = center;
if (cell.HasRiverBeginOrEnd)
{
roadCenter += HexMetrics.GetSolidEdgeMiddle(
cell.RiverBeginOrEndDirection.Opposite()
) * (1f / 3f);
}
else if (cell.IncomingRiver == cell.OutgoingRiver.Opposite())
{
Vector3 corner;
if (previousHasRiver)
{
if (!hasRoadThroughEdge && !cell.HasRoadThroughEdge(direction.Next()))
{
return;
}
corner = HexMetrics.GetSecondSolidCorner(direction);
}
else
{
if (!hasRoadThroughEdge && !cell.HasRoadThroughEdge(direction.Previous()))
{
return;
}
corner = HexMetrics.GetFirstSolidCorner(direction);
}
roadCenter += corner * 0.5f;
center += corner * 0.25f;
}
else if (cell.IncomingRiver == cell.OutgoingRiver.Previous())
{
roadCenter -= HexMetrics.GetSecondCorner(cell.IncomingRiver) * 0.2f;
}
else if (cell.IncomingRiver == cell.OutgoingRiver.Next())
{
roadCenter -= HexMetrics.GetFirstCorner(cell.IncomingRiver) * 0.2f;
}
else if (previousHasRiver && nextHasRiver)
{
if (!hasRoadThroughEdge)
{
return;
}
Vector3 offset = HexMetrics.GetSolidEdgeMiddle(direction) *
HexMetrics.innerToOuter;
roadCenter += offset * 0.7f;
center += offset * 0.5f;
}
else
{
HexDirection middle;
if (previousHasRiver)
{
middle = direction.Next();
}
else if (nextHasRiver)
{
middle = direction.Previous();
}
else
{
middle = direction;
}
if (!cell.HasRoadThroughEdge(middle) && !cell.HasRoadThroughEdge(middle.Previous()) &&
!cell.HasRoadThroughEdge(middle.Next()))
{
return;
}
roadCenter += HexMetrics.GetSolidEdgeMiddle(middle) * 0.25f;
}
Vector3 mL = Vector3.Lerp(roadCenter, e.v1, interpolators.x);
Vector3 mR = Vector3.Lerp(roadCenter, e.v5, interpolators.y);
TriangulateRoad(roadCenter, mL, mR, e, hasRoadThroughEdge);
if (previousHasRiver)
{
TriangulateRoadEdge(roadCenter, center, mL);
}
if (nextHasRiver)
{
TriangulateRoadEdge(roadCenter, mR, center);
}
}