void TriangulateEstuary(HexCell cell, HexDirection direction)
{
var neighbor = cell.GetNeighbor(direction);
EdgeVertices closerWaterEdge = cell.WaterEdges[(int)direction];
EdgeVertices furtherWaterEdge = neighbor.WaterEdges[(int)direction.Opposite()];
EdgeVertices furtherEdge = neighbor.Edges[(int)direction.Opposite()];
furtherEdge.V1.y = HexMetrics.WaterSurfaceY;
furtherEdge.V2.y = HexMetrics.WaterSurfaceY;
furtherEdge.V3.y = HexMetrics.WaterSurfaceY;
furtherEdge.V4.y = HexMetrics.WaterSurfaceY;
furtherEdge.V5.y = HexMetrics.WaterSurfaceY;
WaterShore.AddTriangleUnperturbed(furtherEdge.V5, closerWaterEdge.V2, closerWaterEdge.V1);
WaterShore.AddTriangleUnperturbed(furtherEdge.V1, closerWaterEdge.V5, closerWaterEdge.V4);
WaterShore.AddTriangleUV(new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f));
WaterShore.AddTriangleUV(new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f));
// left quad
// quad is rotated 90 degrees to the right so the diagonal connection is shorter
// it is done to maintain the symetry with the other quad
Estuaries.AddQuadUnperturbed(furtherEdge.V5, closerWaterEdge.V2, furtherEdge.V4, closerWaterEdge.V3);
Estuaries.AddQuadUV(new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(1f, 1f), new Vector2(0f, 0f));
// big triangle in the middle
Estuaries.AddTriangleUnperturbed(closerWaterEdge.V3, furtherEdge.V4, furtherEdge.V2);
Estuaries.AddTriangleUV(new Vector2(0f, 0f), new Vector2(1f, 1f), new Vector2(0f, 1f));
// right quad
Estuaries.AddQuadUnperturbed(closerWaterEdge.V3, closerWaterEdge.V4, furtherEdge.V2, furtherEdge.V1);
Estuaries.AddQuadUV(new Vector2(0f, 0f), new Vector2(0f, 0f), new Vector2(1f, 1f), new Vector2(0f, 1f));
// is incoming river
if (cell.IncomingRiver == direction)
{
Estuaries.AddQuadUV2(
new Vector2(1.5f, 1f), new Vector2(0.7f, 1.15f),
new Vector2(1f, 0.8f), new Vector2(0.5f, 1.1f));
Estuaries.AddTriangleUV2(
new Vector2(0.5f, 1.1f), new Vector2(1f, 0.8f), new Vector2(0f, 0.8f));
Estuaries.AddQuadUV2(
new Vector2(0.5f, 1.1f), new Vector2(0.3f, 1.15f),
new Vector2(0f, 0.8f), new Vector2(-0.5f, 1f));
}
else
{
// the U coordinates have to be mirrored for outgoing rivers
// the V coordinates are a little bit less straightforward
Estuaries.AddQuadUV2(
new Vector2(-0.5f, -0.2f), new Vector2(0.3f, -0.35f),
new Vector2(0f, 0f), new Vector2(0.5f, -0.3f));
Estuaries.AddTriangleUV2(
new Vector2(0.5f, -0.3f), new Vector2(0f, 0f), new Vector2(1f, 0f));
Estuaries.AddQuadUV2(
new Vector2(0.5f, -0.3f), new Vector2(0.7f, -0.35f),
new Vector2(1f, 0f), new Vector2(1.5f, -0.2f));
}
}
private void TriangulateEstuary(EdgeVertices e1, EdgeVertices e2, bool incomingRiver, Vector3 indices)
{
WaterShore.AddTriangle(e2.v1, e1.v2, e1.v1);
WaterShore.AddTriangle(e2.v5, e1.v5, e1.v4);
WaterShore.AddTriangleUV(
new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f)
);
WaterShore.AddTriangleUV(
new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f)
);
WaterShore.AddTriangleCellData(indices, weights2, weights1, weights1);
WaterShore.AddTriangleCellData(indices, weights2, weights1, weights1);
Estuaries.AddQuad(e2.v1, e1.v2, e2.v2, e1.v3);
Estuaries.AddTriangle(e1.v3, e2.v2, e2.v4);
Estuaries.AddQuad(e1.v3, e1.v4, e2.v4, e2.v5);
Estuaries.AddQuadUV(
new Vector2(0f, 1f), new Vector2(0f, 0f),
new Vector2(1f, 1f), new Vector2(0f, 0f));
Estuaries.AddTriangleUV(
new Vector2(0f, 0f), new Vector2(1f, 1f), new Vector2(1f, 1f));
Estuaries.AddQuadUV(
new Vector2(0f, 0f), new Vector2(0f, 0f),
new Vector2(1f, 1f), new Vector2(0f, 1f));
Estuaries.AddQuadCellData(indices, weights2, weights1, weights2, weights1);
Estuaries.AddTriangleCellData(indices, weights1, weights2, weights2);
Estuaries.AddQuadCellData(indices, weights1, weights2);
if (incomingRiver)
{
Estuaries.AddQuadUV2(
new Vector2(1.5f, 1f), new Vector2(0.7f, 1.15f),
new Vector2(1f, 0.8f), new Vector2(0.5f, 1.1f));
Estuaries.AddTriangleUV2(
new Vector2(0.5f, 1.1f), new Vector2(1f, 0.8f), new Vector2(0f, 0.8f));
Estuaries.AddQuadUV2(
new Vector2(0.5f, 1.1f), new Vector2(0.3f, 1.15f),
new Vector2(0f, 0.8f), new Vector2(-0.5f, 1f));
}
else
{
Estuaries.AddQuadUV2(
new Vector2(-0.5f, -0.2f), new Vector2(0.3f, -0.35f),
new Vector2(0f, 0f), new Vector2(0.5f, -0.3f));
Estuaries.AddTriangleUV2(
new Vector2(0.5f, -0.3f), new Vector2(0f, 0f), new Vector2(1f, 0f));
Estuaries.AddQuadUV2(
new Vector2(0.5f, -0.3f), new Vector2(0.7f, -0.35f),
new Vector2(1f, 0f), new Vector2(1.5f, -0.2f));
}
}
/// <summary>
/// Creates the estuary (when river meets shore) geometry.
/// </summary>
void TriangulateEstuary(EdgeVertices e1, EdgeVertices e2, bool incomingRiver, Vector3 indices)
{
// Some of the estuary is still water shore, namely one triangle on each side
// that leaves the estuary itself with a trapezoid shape connecting the shore/river to water
WaterShore.AddTriangle(e2.v1, e1.v2, e1.v1);
WaterShore.AddTriangle(e2.v5, e1.v5, e1.v4);
WaterShore.AddTriangleUV(new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f));
WaterShore.AddTriangleUV(new Vector2(0f, 1f), new Vector2(0f, 0f), new Vector2(0f, 0f));
WaterShore.AddTriangleCellData(indices, weights2, weights1, weights1);
WaterShore.AddTriangleCellData(indices, weights2, weights1, weights1);
// Make the estuary trapezoid
Estuaries.AddQuad(e2.v1, e1.v2, e2.v2, e1.v3); // Adding it rotated for symetric geometry
Estuaries.AddTriangle(e1.v3, e2.v2, e2.v4);
Estuaries.AddQuad(e1.v3, e1.v4, e2.v4, e2.v5);
// For shore effect
Estuaries.AddQuadUV(
new Vector2(0f, 1f), new Vector2(0f, 0f),
new Vector2(1f, 1f), new Vector2(0f, 0f)
);
Estuaries.AddTriangleUV(
new Vector2(0f, 0f), new Vector2(1f, 1f), new Vector2(1f, 1f)
);
Estuaries.AddQuadUV(
new Vector2(0f, 0f), new Vector2(0f, 0f),
new Vector2(1f, 1f), new Vector2(0f, 1f)
);
Estuaries.AddQuadCellData(indices, weights2, weights1, weights2, weights1);
Estuaries.AddTriangleCellData(indices, weights1, weights2, weights2);
Estuaries.AddQuadCellData(indices, weights1, weights2);
// For river effect, depending on river flow direction UVs are different
// That is if river flows into the water or out of the water (e.g. when a river starts from a lake)
if (incomingRiver)
{
Estuaries.AddQuadUV2(new Vector2(1.5f, 1f), new Vector2(0.7f, 1.15f), new Vector2(1f, 0.8f), new Vector2(0.5f, 1.1f));
Estuaries.AddTriangleUV2(new Vector2(0.5f, 1.1f), new Vector2(1f, 0.8f), new Vector2(0f, 0.8f));
Estuaries.AddQuadUV2(new Vector2(0.5f, 1.1f), new Vector2(0.3f, 1.15f), new Vector2(0f, 0.8f), new Vector2(-0.5f, 1f));
}
else
{
Estuaries.AddQuadUV2(new Vector2(-0.5f, -0.2f), new Vector2(0.3f, -0.35f), new Vector2(0f, 0f), new Vector2(0.5f, -0.3f));
Estuaries.AddTriangleUV2(new Vector2(0.5f, -0.3f), new Vector2(0f, 0f), new Vector2(1f, 0f));
Estuaries.AddQuadUV2(new Vector2(0.5f, -0.3f), new Vector2(0.7f, -0.35f), new Vector2(1f, 0f), new Vector2(1.5f, -0.2f));
}
}
/// <summary>
/// Creates geometry for water connection non water cell.
/// </summary>
void TriangulateWaterShore(HexDirection direction, HexCell cell, HexCell neighbor, Vector3 center)
{
// Careful to find the WATER corner not the solid corner
// Careful to get the WATER bridge
EdgeVertices e1 = new EdgeVertices(
center + HexMetrics.GetFirstWaterCorner(direction),
center + HexMetrics.GetSecondWaterCorner(direction)
);
// Triangle fan still part of open water
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);
// Bridge - We get the bridge by finding the land hex center and working from there
Vector3 center2 = neighbor.Position;
if (neighbor.ColumnIndex < cell.ColumnIndex - 1)
{
center2.x += HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
else if (neighbor.ColumnIndex > cell.ColumnIndex + 1)
{
center2.x -= HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
center2.y = center.y;
EdgeVertices 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); // River and Shore meet -> Estuary -> different geometry
}
else // Else normal shore geometry
{
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); // U null, V -> 0 water side, 1 shore side
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);
}
// Corner tripple connection triangle - shore water
HexCell nextNeighbor = cell.GetNeighbor(direction.Next());
if (nextNeighbor != null)
{
Vector3 center3 = nextNeighbor.Position;
if (nextNeighbor.ColumnIndex < cell.ColumnIndex - 1)
{
center3.x += HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
else if (nextNeighbor.ColumnIndex > cell.ColumnIndex + 1)
{
center3.x -= HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
// Since this is a tripple connection we need to check if neighbor is underwater or not
// If he is underwater connect with WaterCorner if not with SolidCorner
Vector3 v3 = center3 + (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) // U null, V -> 0 water side, 1 shore side
);
indices.z = nextNeighbor.Index;
WaterShore.AddTriangleCellData(indices, weights1, weights2, weights3);
}
}
void TriangulateWater(HexDirection direction, HexCell cell)
{
EdgeVertices closerWaterEdge = cell.WaterEdges[(int)direction];
// water fan
Water.AddTriangleUnperturbed(cell.WaterCenter, closerWaterEdge.V1, closerWaterEdge.V5);
HexCell neighbor = cell.GetNeighbor(direction);
if (neighbor == null)
{
return;
}
// estuary
if (!neighbor.IsUnderwater && cell.HasRiverThroughEdge(direction))
{
TriangulateEstuary(cell, direction);
}
EdgeVertices furtherEdge = neighbor.Edges[(int)direction.Opposite()];
EdgeVertices furtherWaterEdge = neighbor.WaterEdges[(int)direction.Opposite()];
HexDirection nextDirection = direction.Next();
HexCell nextNeighbor = cell.GetNeighbor(nextDirection);
HexCell previousNeighbor = cell.GetNeighbor(direction.Previous());
// neighbor is under water as well
if (neighbor.IsUnderwater)
{
if (direction <= HexDirection.SouthEast)
{
Water.AddQuadUnperturbed(closerWaterEdge.V1, closerWaterEdge.V5, furtherWaterEdge.V5, furtherWaterEdge.V1);
}
}
// estuary is on the right side
else if (nextNeighbor != null && nextNeighbor.HasEstuaryThroughEdge(direction.Previous()))
{
Vector3 v4 = furtherEdge.V1;
v4.y = HexMetrics.WaterSurfaceY;
WaterShore.AddQuadUnperturbed(closerWaterEdge.V1, closerWaterEdge.V5, furtherWaterEdge.V5, v4);
WaterShore.AddQuadUV(0f, 0f, 0f, 1f);
}
// estuary is on the left side
else if (previousNeighbor != null && previousNeighbor.HasEstuaryThroughEdge(direction.Next()))
{
Vector3 v3 = furtherEdge.V5;
v3.y = HexMetrics.WaterSurfaceY;
WaterShore.AddQuadUnperturbed(closerWaterEdge.V1, closerWaterEdge.V5, v3, furtherWaterEdge.V1);
WaterShore.AddQuadUV(0f, 0f, 0f, 1f);
}
// standard connection quad
else if (!cell.HasRiverThroughEdge(direction))
{
WaterShore.AddQuadUnperturbed(closerWaterEdge.V1, closerWaterEdge.V5, furtherWaterEdge.V5, furtherWaterEdge.V1);
WaterShore.AddQuadUV(0f, 0f, 0f, 1f);
}
// calculate connection triangles
if (neighbor.IsUnderwater)
{
if (direction <= HexDirection.East && nextNeighbor != null && nextNeighbor.IsUnderwater)
{
Vector3 v3 = nextNeighbor.WaterEdges[(int)nextDirection.Opposite()].V5;
Water.AddTriangleUnperturbed(closerWaterEdge.V5, furtherWaterEdge.V1, v3);
}
}
// calculate water shore
else if (cell.HasRiverThroughEdge(direction) && nextNeighbor != null)
{
Vector3 v2 = neighbor.Edges[(int)direction.Opposite()].V1;
v2.y = HexMetrics.WaterSurfaceY;
Vector3 v3 = nextNeighbor.WaterEdges[(int)nextDirection.Opposite()].V5;
WaterShore.AddTriangleUnperturbed(closerWaterEdge.V5, v2, v3);
WaterShore.AddTriangleUV(new Vector2(0f, 0f), new Vector2(0f, 1f),
new Vector2(0f, nextNeighbor.IsUnderwater ? 0f : 1f));
}
else if (nextNeighbor != null)
{
Vector3 v2, v3;
// estuary is on the right side
if (cell.HasRiverThroughEdge(nextDirection))
{
v2 = furtherWaterEdge.V1;
v3 = nextNeighbor.Edges[(int)nextDirection.Opposite()].V5;
v3.y = HexMetrics.WaterSurfaceY;
}
// estuary is on the left side
else if (nextNeighbor.HasEstuaryThroughEdge(direction.Previous()))
{
v2 = furtherEdge.V1;
v2.y = HexMetrics.WaterSurfaceY;
v3 = nextNeighbor.WaterEdges[(int)nextDirection.Opposite()].V5;
}
else
{
v2 = furtherWaterEdge.V1;
v3 = nextNeighbor.WaterEdges[(int)nextDirection.Opposite()].V5;
}
WaterShore.AddTriangleUnperturbed(closerWaterEdge.V5, v2, v3);
WaterShore.AddTriangleUV(new Vector2(0f, 0f), new Vector2(0f, 1f),
new Vector2(0f, nextNeighbor.IsUnderwater ? 0f : 1f));
}
}
private void TriangulateWaterShore(HexDirection direction, HexCell cell, HexCell neighbour, Vector3 centre)
{
var e1 = new EdgeVertices(
centre + HexMetrics.GetFirstWaterCorner(direction),
centre + HexMetrics.GetSecondWaterCorner(direction)
);
Water.AddTriangle(centre, e1.v1, e1.v2);
Water.AddTriangle(centre, e1.v2, e1.v3);
Water.AddTriangle(centre, e1.v3, e1.v4);
Water.AddTriangle(centre, e1.v4, e1.v5);
var indices = new Vector3(cell.Index, neighbour.Index, cell.Index);
Water.AddTriangleCellData(indices, weights1);
Water.AddTriangleCellData(indices, weights1);
Water.AddTriangleCellData(indices, weights1);
Water.AddTriangleCellData(indices, weights1);
var centre2 = neighbour.Position;
if (neighbour.ColumnIndex < cell.ColumnIndex - 1)
{
centre2.x += HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
else if (neighbour.ColumnIndex > cell.ColumnIndex + 1)
{
centre2.x -= HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
centre2.y = centre.y;
var e2 = new EdgeVertices(
centre2 + HexMetrics.GetSecondSolidCorner(direction.Opposite()),
centre2 + HexMetrics.GetFirstSolidCorner(direction.Opposite())
); // rather than calculating from current centre, work backwards from neighbour centre to find edge
if (cell.HasRiverThroughEdge(direction))
{
TriangulateEstuary(e1, e2, 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 nextNeighbour = cell.GetNeighbour(direction.Next());
if (nextNeighbour == null)
{
return;
}
var centre3 = nextNeighbour.Position;
if (nextNeighbour.ColumnIndex < cell.ColumnIndex - 1)
{
centre3.x += HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
else if (nextNeighbour.ColumnIndex > cell.ColumnIndex + 1)
{
centre3.x -= HexMetrics.WrapSize * HexMetrics.InnerDiameter;
}
var v3 = centre3 +
(nextNeighbour.IsUnderwater ?
HexMetrics.GetFirstWaterCorner(direction.Previous()) :
HexMetrics.GetFirstSolidCorner(direction.Previous()));
v3.y = centre.y;
WaterShore.AddTriangle(e1.v5, e2.v5, v3);
WaterShore.AddTriangleUV(
new Vector2(0f, 0f),
new Vector2(0f, 1f),
new Vector2(0f, nextNeighbour.IsUnderwater ? 0f : 1f));
indices.z = nextNeighbour.Index;
WaterShore.AddTriangleCellData(indices, weights1, weights2, weights3);
}
