public Vector3 GetRiverMidpointOffset(VoronoiDirection direction)
{
VoronoiDirection prevRiver = direction;
while (!HasRiverThroughEdge(prevRiver))
{
prevRiver = prevRiver.Previous(this);
}
int steps = 0;
VoronoiDirection nextRiver = prevRiver;
while (!HasRiverThroughEdge(nextRiver) || nextRiver == prevRiver)
{
nextRiver = nextRiver.Next(this);
++steps;
}
VoronoiDirection halfDirection = prevRiver;
for (int i = 0; i < steps / 2; ++i)
{
halfDirection = halfDirection.Next(this);
}
if (steps % 2 == 0)
{
return(VoronoiMetrics.GetSolidEdgeMiddle(this, halfDirection) *
VoronoiMetrics.InnerToOuter(this, halfDirection));
}
return(VoronoiMetrics.GetSecondSolidCorner(this, halfDirection));
}
private void Triangulate(VoronoiCell cell, VoronoiDirection direction)
{
Vector3 center = cell.transform.localPosition;
EdgeVertices e = new EdgeVertices(
center + VoronoiMetrics.GetFirstSolidCorner(cell, direction),
center + VoronoiMetrics.GetSecondSolidCorner(cell, direction)
);
if (cell.HasRiver)
{
if (cell.HasRiverThroughEdge(direction))
{
e.V3 = Vector3.ClampMagnitude(e.V3, cell.StreamBedElevation);
if (cell.HasRiverBeginOrEnd)
{
TriangulateWithRiverBeginOrEnd(cell, direction, center, e);
}
else
{
TriangulateWithRiver(cell, direction, center, e);
}
}
else
{
TriangulateAdjacentToRiver(cell, direction, center, e);
}
}
else
{
TriangulateWithoutRiver(cell, direction, center, e);
}
if (cell.EdgeConnections.Contains(direction))
{
TriangulateConnection(cell, direction, e);
}
if (cell.IsUnderwater)
{
TriangulateWater(cell, direction, center);
}
}
private void TriangulateWater(VoronoiCell cell, VoronoiDirection direction, Vector3 center)
{
center = center.normalized * cell.WaterSurfaceElevation;
Vector3 c1 = center + VoronoiMetrics.GetFirstSolidCorner(cell, direction);
Vector3 c2 = center + VoronoiMetrics.GetSecondSolidCorner(cell, direction);
Water.AddTriangle(center, c1, c2);
if (cell.EdgeConnections.Contains(direction))
{
VoronoiCell neighbor = cell.GetNeighbor(direction);
if (neighbor == null || !neighbor.IsUnderwater)
{
return;
}
Vector3 bridge = VoronoiMetrics.GetWaterBridge(cell, direction);
Vector3 e1 = c1 + bridge;
Vector3 e2 = c2 + bridge;
Water.AddQuad(c1, c2, e1, e2);
}
if (cell.CornerConnections.Contains(direction))
{
VoronoiCell neighbor = cell.GetNeighbor(direction);
VoronoiCell nextNeighbor = cell.GetNeighbor(direction.Next(cell));
if (neighbor == null || !neighbor.IsUnderwater || nextNeighbor == null || !nextNeighbor.IsUnderwater)
{
return;
}
Vector3 bridge = VoronoiMetrics.GetWaterBridge(cell, direction);
Vector3 e2 = c2 + bridge;
Water.AddTriangle(c2, e2, c2 + VoronoiMetrics.GetWaterBridge(cell, direction.Next(cell)));
}
}
private void TriangulateWithRiver(VoronoiCell cell, VoronoiDirection direction, Vector3 center, EdgeVertices e)
{
Vector3 centerR;
Vector3 centerL = centerR = center;
// 4 sided straight
if (cell.HasRiverThroughEdge(direction.Next2(cell)) && cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
centerL = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous(cell)) *
(0.25f * VoronoiMetrics.InnerToOuter(cell, direction.Previous(cell)));
centerR = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next(cell)) *
(0.25f * VoronoiMetrics.InnerToOuter(cell, direction.Next(cell)));
// 1 step turn
}
else if (cell.HasRiverThroughEdge(direction.Next(cell)))
{
centerL = center;
centerR = Vector3.Lerp(center, e.V5, 2 / 3f);
// 1 step turn
}
else if (cell.HasRiverThroughEdge(direction.Previous(cell)))
{
centerL = Vector3.Lerp(center, e.V1, 2 / 3f);
centerR = center;
// 2 step turn
}
else if (cell.HasRiverThroughEdge(direction.Next2(cell)))
{
centerL = center;
centerR = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next(cell)) *
(0.5f * VoronoiMetrics.InnerToOuter(cell, direction.Next(cell)));
// 2 step turn
}
else if (cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
centerL = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous(cell)) *
(0.5f * VoronoiMetrics.InnerToOuter(cell, direction.Previous(cell)));
centerR = center;
// 6 sided straight
}
else if (cell.HasRiverThroughEdge(direction.Next3(cell)) &&
cell.HasRiverThroughEdge(direction.Previous3(cell)))
{
centerL = center + VoronoiMetrics.GetFirstSolidCorner(cell, direction.Previous(cell)) * 0.25f;
centerR = center + VoronoiMetrics.GetSecondSolidCorner(cell, direction.Next(cell)) * 0.25f;
// 7 sided straight
}
else if (cell.HasRiverThroughEdge(direction.Previous3(cell)) &&
cell.HasRiverThroughEdge(direction.Next4(cell)) &&
cell.Neighbors.Count > 4)
{
centerL = center + VoronoiMetrics.GetFirstSolidCorner(cell, direction.Previous(cell)) * 0.25f;
centerR = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next2(cell)) * 0.25f;
// 7 sided straight
}
else if (cell.HasRiverThroughEdge(direction.Previous4(cell)) &&
cell.HasRiverThroughEdge(direction.Next3(cell)) &&
cell.Neighbors.Count > 4)
{
centerL = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous2(cell)) * 0.25f;
centerR = center + VoronoiMetrics.GetSecondSolidCorner(cell, direction.Next(cell)) * 0.25f;
// 8 sided straight
}
else if (cell.HasRiverThroughEdge(direction.Previous4(cell)) &&
cell.HasRiverThroughEdge(direction.Next4(cell)) &&
cell.Neighbors.Count > 4)
{
centerL = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous2(cell)) * 0.25f;
centerR = center + VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next2(cell)) * 0.25f;
// 3 step turn
}
else if (cell.HasRiverThroughEdge(direction.Previous3(cell)) &&
cell.HasRiverThroughEdge(direction.Next5(cell)) &&
cell.Neighbors.Count > 5)
{
centerR = center + VoronoiMetrics.GetSecondSolidCorner(cell, direction.Next2(cell)) * 0.25f;
centerL = center + VoronoiMetrics.GetFirstSolidCorner(cell, direction.Previous(cell)) * 0.25f;
// 3 step turn
}
else if (cell.HasRiverThroughEdge(direction.Previous5(cell)) &&
cell.HasRiverThroughEdge(direction.Next3(cell)) &&
cell.Neighbors.Count > 5)
{
centerL = center + VoronoiMetrics.GetFirstSolidCorner(cell, direction.Previous2(cell)) * 0.25f;
centerR = center + VoronoiMetrics.GetSecondSolidCorner(cell, direction.Next(cell)) * 0.25f;
}
center = Vector3.Lerp(centerL, centerR, 0.5f);
EdgeVertices m = new EdgeVertices(
Vector3.Lerp(centerL, e.V1, 0.5f),
Vector3.Lerp(centerR, e.V5, 0.5f),
1 / 6f
);
m.V3 = Vector3.ClampMagnitude(m.V3, cell.StreamBedElevation);
center = Vector3.ClampMagnitude(center, cell.StreamBedElevation);
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);
bool reversed = cell.IncomingRiver == direction;
TriangulateRiverQuad(centerL, centerR, m.V2, m.V4, cell.RiverSurfaceElevation, 0.4f, reversed);
TriangulateRiverQuad(m.V2, m.V4, e.V2, e.V4, cell.RiverSurfaceElevation, 0.6f, reversed);
}
private void TriangulateAdjacentToRiver(VoronoiCell cell, VoronoiDirection direction, Vector3 center, EdgeVertices e)
{
if (cell.HasRoads)
{
TriangulateRoadAdjacentToRiver(cell, direction, center, e);
}
// Inside two step turn
if (cell.HasRiverThroughEdge(direction.Next(cell)) &&
cell.HasRiverThroughEdge(direction.Previous(cell)))
{
if (cell.Neighbors.Count == 4)
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction) *
(0.25f * VoronoiMetrics.InnerToOuter(cell, direction));
}
else
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction) *
(0.5f * VoronoiMetrics.InnerToOuter(cell, direction));
}
// 6 sided adjacencies
}
else if (cell.Neighbors.Count == 6)
{
if (cell.HasRiverThroughEdge(direction.Next(cell)) &&
cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
center += VoronoiMetrics.GetFirstSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous(cell)) &&
cell.HasRiverThroughEdge(direction.Next2(cell)))
{
center += VoronoiMetrics.GetSecondSolidCorner(cell, direction) * 0.25f;
}
// 7 sided adjacencies
}
else if (cell.Neighbors.Count == 7)
{
if (cell.HasRiverThroughEdge(direction.Next(cell)) &&
cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
center += VoronoiMetrics.GetFirstSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous(cell)) &&
cell.HasRiverThroughEdge(direction.Next2(cell)))
{
center += VoronoiMetrics.GetSecondSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next2(cell)) &&
cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next(cell)) &&
cell.HasRiverThroughEdge(direction.Previous3(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous(cell)) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next3(cell)) &&
cell.HasRiverThroughEdge(direction.Previous(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next(cell)) * 0.25f;
}
}
else if (cell.Neighbors.Count == 8)
{
if (cell.HasRiverThroughEdge(direction.Next(cell)) &&
cell.HasRiverThroughEdge(direction.Previous3(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Previous(cell)) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next2(cell)) &&
cell.HasRiverThroughEdge(direction.Previous2(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Next3(cell)) &&
cell.HasRiverThroughEdge(direction.Previous(cell)))
{
center += VoronoiMetrics.GetSolidEdgeMiddle(cell, direction.Next(cell)) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous(cell)) &&
cell.HasRiverThroughEdge(direction.Next4(cell)))
{
center += VoronoiMetrics.GetSecondSolidCorner(cell, direction.Next(cell)) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous2(cell)) &&
cell.HasRiverThroughEdge(direction.Next3(cell)))
{
center += VoronoiMetrics.GetSecondSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous3(cell)) &&
cell.HasRiverThroughEdge(direction.Next2(cell)))
{
center += VoronoiMetrics.GetFirstSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous4(cell)) &&
cell.HasRiverThroughEdge(direction.Next(cell)))
{
center += VoronoiMetrics.GetFirstSolidCorner(cell, direction.Previous(cell)) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous(cell)) &&
cell.HasRiverThroughEdge(direction.Next2(cell)))
{
center += VoronoiMetrics.GetSecondSolidCorner(cell, direction) * 0.25f;
}
else if (cell.HasRiverThroughEdge(direction.Previous2(cell)) &&
cell.HasRiverThroughEdge(direction.Next(cell)))
{
center += VoronoiMetrics.GetFirstSolidCorner(cell, 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);
}