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;
}
var m = new EdgeVertices(
Vector3.Lerp(center, e.v1, 0.5f),
Vector3.Lerp(center, e.v5, 0.5f)
);
TriangulateEdgeStrip(
m, weights1, cell.Index,
e, weights1, cell.Index
);
TriangulateEdgeFan(center, m, cell.Index);
if (!cell.IsUnderwater && !cell.HasRoadThroughEdge(direction))
{
features.AddFeature(cell, (center + e.v1 + e.v5) * (1f / 3f));
}
}
private void Triangulate(HexDirection direction, HexCell cell)
{
var center = cell.Position;
var e = new EdgeVertices(
center + HexMetrics.GetFirstSolidCorner(direction),
center + HexMetrics.GetSecondSolidCorner(direction)
);
if (cell.HasRiver)
{
if (cell.HasRiverThroughEdge(direction))
{
e.v3.y = cell.StreamBedY;
if (cell.HasRiverBeginOrEnd)
{
TriangulateWithRiverBeginOrEnd(direction, cell, center, e);
}
else
{
TriangulateWithRiver(direction, cell, center, e);
}
}
else
{
TriangulateAdjacentToRiver(direction, cell, center, e);
}
}
else
{
TriangulateWithoutRiver(direction, cell, center, e);
if (!cell.IsUnderwater && !cell.HasRoadThroughEdge(direction))
{
features.AddFeature(cell, (center + e.v1 + e.v5) * (1f / 3f));
}
}
if (direction <= HexDirection.SE)
{
TriangulateConnection(direction, cell, e);
}
if (cell.IsUnderwater)
{
TriangulateWater(direction, cell, center);
}
}
private void TriangulateConnection(
HexDirection direction, HexCell cell, EdgeVertices e1
)
{
var neighbor = cell.GetNeighbor(direction);
if (neighbor == null)
{
return;
}
var bridge = HexMetrics.GetBridge(direction);
bridge.y = neighbor.Position.y - cell.Position.y;
var e2 = new EdgeVertices(
e1.v1 + bridge,
e1.v5 + bridge
);
var hasRiver = cell.HasRiverThroughEdge(direction);
var hasRoad = cell.HasRoadThroughEdge(direction);
if (hasRiver)
{
e2.v3.y = neighbor.StreamBedY;
Vector3 indices;
indices.x = indices.z = cell.Index;
indices.y = neighbor.Index;
if (!cell.IsUnderwater)
{
if (!neighbor.IsUnderwater)
{
TriangulateRiverQuad(
e1.v2, e1.v4, e2.v2, e2.v4,
cell.RiverSurfaceY, neighbor.RiverSurfaceY, 0.8f,
cell.HasIncomingRiver && cell.IncomingRiver == direction,
indices
);
}
else if (cell.Elevation > neighbor.WaterLevel)
{
TriangulateWaterfallInWater(
e1.v2, e1.v4, e2.v2, e2.v4,
cell.RiverSurfaceY, neighbor.RiverSurfaceY,
neighbor.WaterSurfaceY, indices
);
}
}
else if (
!neighbor.IsUnderwater &&
neighbor.Elevation > cell.WaterLevel
)
{
TriangulateWaterfallInWater(
e2.v4, e2.v2, e1.v4, e1.v2,
neighbor.RiverSurfaceY, cell.RiverSurfaceY,
cell.WaterSurfaceY, indices
);
}
}
if (cell.GetEdgeType(direction) == HexEdgeType.Slope)
{
TriangulateEdgeTerraces(e1, cell, e2, neighbor, hasRoad);
}
else
{
TriangulateEdgeStrip(
e1, weights1, cell.Index,
e2, weights2, neighbor.Index, hasRoad
);
}
features.AddWall(e1, cell, e2, neighbor, hasRiver, hasRoad);
var nextNeighbor = cell.GetNeighbor(direction.Next());
if (direction <= HexDirection.E && nextNeighbor != null)
{
var v5 = e1.v5 + HexMetrics.GetBridge(direction.Next());
v5.y = nextNeighbor.Position.y;
if (cell.Elevation <= neighbor.Elevation)
{
if (cell.Elevation <= nextNeighbor.Elevation)
{
TriangulateCorner(
e1.v5, cell, e2.v5, neighbor, v5, nextNeighbor
);
}
else
{
TriangulateCorner(
v5, nextNeighbor, e1.v5, cell, e2.v5, neighbor
);
}
}
else if (neighbor.Elevation <= nextNeighbor.Elevation)
{
TriangulateCorner(
e2.v5, neighbor, v5, nextNeighbor, e1.v5, cell
);
}
else
{
TriangulateCorner(
v5, nextNeighbor, e1.v5, cell, e2.v5, neighbor
);
}
}
}
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);
var 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, weights1, cell.Index,
e, weights1, cell.Index
);
terrain.AddTriangle(centerL, m.v1, m.v2);
terrain.AddQuad(centerL, center, m.v2, m.v3);
terrain.AddQuad(center, centerR, m.v3, m.v4);
terrain.AddTriangle(centerR, m.v4, m.v5);
Vector3 indices;
indices.x = indices.y = indices.z = cell.Index;
terrain.AddTriangleCellData(indices, weights1);
terrain.AddQuadCellData(indices, weights1);
terrain.AddQuadCellData(indices, weights1);
terrain.AddTriangleCellData(indices, weights1);
if (!cell.IsUnderwater)
{
var reversed = cell.IncomingRiver == direction;
TriangulateRiverQuad(
centerL, centerR, m.v2, m.v4,
cell.RiverSurfaceY, 0.4f, reversed, indices
);
TriangulateRiverQuad(
m.v2, m.v4, e.v2, e.v4,
cell.RiverSurfaceY, 0.6f, reversed, indices
);
}
}
private void TriangulateRoadAdjacentToRiver(
HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e
)
{
var hasRoadThroughEdge = cell.HasRoadThroughEdge(direction);
var previousHasRiver = cell.HasRiverThroughEdge(direction.Previous());
var nextHasRiver = cell.HasRiverThroughEdge(direction.Next());
var interpolators = GetRoadInterpolators(direction, cell);
var 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;
if (cell.IncomingRiver == direction.Next() && (
cell.HasRoadThroughEdge(direction.Next2()) ||
cell.HasRoadThroughEdge(direction.Opposite())
))
{
features.AddBridge(roadCenter, center - 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;
}
var 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;
}
var offset = HexMetrics.GetSolidEdgeMiddle(middle);
roadCenter += offset * 0.25f;
if (
direction == middle &&
cell.HasRoadThroughEdge(direction.Opposite())
)
{
features.AddBridge(
roadCenter,
center - offset * (HexMetrics.innerToOuter * 0.7f)
);
}
}
var mL = Vector3.Lerp(roadCenter, e.v1, interpolators.x);
var mR = Vector3.Lerp(roadCenter, e.v5, interpolators.y);
TriangulateRoad(roadCenter, mL, mR, e, hasRoadThroughEdge, cell.Index);
if (previousHasRiver)
{
TriangulateRoadEdge(roadCenter, center, mL, cell.Index);
}
if (nextHasRiver)
{
TriangulateRoadEdge(roadCenter, mR, center, cell.Index);
}
}
private void TriangulateWaterShore(
HexDirection direction, HexCell cell, HexCell neighbor, Vector3 center
)
{
var e1 = new EdgeVertices(
center + HexMetrics.GetFirstWaterCorner(direction),
center + HexMetrics.GetSecondWaterCorner(direction)
);
water.AddTriangle(center, e1.v1, e1.v2);
water.AddTriangle(center, e1.v2, e1.v3);
water.AddTriangle(center, e1.v3, e1.v4);
water.AddTriangle(center, e1.v4, e1.v5);
Vector3 indices;
indices.x = indices.z = cell.Index;
indices.y = neighbor.Index;
water.AddTriangleCellData(indices, weights1);
water.AddTriangleCellData(indices, weights1);
water.AddTriangleCellData(indices, weights1);
water.AddTriangleCellData(indices, weights1);
var center2 = neighbor.Position;
center2.y = center.y;
var e2 = new EdgeVertices(
center2 + HexMetrics.GetSecondSolidCorner(direction.Opposite()),
center2 + HexMetrics.GetFirstSolidCorner(direction.Opposite())
);
if (cell.HasRiverThroughEdge(direction))
{
TriangulateEstuary(
e1, e2,
cell.HasIncomingRiver && cell.IncomingRiver == direction, indices
);
}
else
{
waterShore.AddQuad(e1.v1, e1.v2, e2.v1, e2.v2);
waterShore.AddQuad(e1.v2, e1.v3, e2.v2, e2.v3);
waterShore.AddQuad(e1.v3, e1.v4, e2.v3, e2.v4);
waterShore.AddQuad(e1.v4, e1.v5, e2.v4, e2.v5);
waterShore.AddQuadUV(0f, 0f, 0f, 1f);
waterShore.AddQuadUV(0f, 0f, 0f, 1f);
waterShore.AddQuadUV(0f, 0f, 0f, 1f);
waterShore.AddQuadUV(0f, 0f, 0f, 1f);
waterShore.AddQuadCellData(indices, weights1, weights2);
waterShore.AddQuadCellData(indices, weights1, weights2);
waterShore.AddQuadCellData(indices, weights1, weights2);
waterShore.AddQuadCellData(indices, weights1, weights2);
}
var nextNeighbor = cell.GetNeighbor(direction.Next());
if (nextNeighbor != null)
{
var v3 = nextNeighbor.Position + (nextNeighbor.IsUnderwater
? HexMetrics.GetFirstWaterCorner(direction.Previous())
: HexMetrics.GetFirstSolidCorner(direction.Previous()));
v3.y = center.y;
waterShore.AddTriangle(e1.v5, e2.v5, v3);
waterShore.AddTriangleUV(
new Vector2(0f, 0f),
new Vector2(0f, 1f),
new Vector2(0f, nextNeighbor.IsUnderwater ? 0f : 1f)
);
indices.z = nextNeighbor.Index;
waterShore.AddTriangleCellData(
indices, weights1, weights2, weights3
);
}
}