void TriangulateAdjacentToRiver(HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e)
{
//alter channel center
if (cell.HasRoads)
{
TriangulateRoadAdjacentToRiver(direction, cell, center, e);
}
if (cell.HasRiverThroughEdge(direction.Next()))
{
if (cell.HasRiverThroughEdge(direction.Previous()))
{
center += HexMetric.GetSolidEdgeMiddle(direction) * (HexMetric.innerToOuter * 0.5f);
}
else if (cell.HasRiverThroughEdge(direction.Previous2()))
{
center += HexMetric.GetFirstSolidCorner(direction) * 0.25f;
}
}
else if (cell.HasRiverThroughEdge(direction.Previous()) && cell.HasRiverThroughEdge(direction.Next2()))
{
center += HexMetric.GetSecondSolidCorner(direction) * 0.25f;
}
EdgeVertices m = new EdgeVertices(Vector3.Lerp(center, e.v1, 0.5f), Vector3.Lerp(center, e.v5, 0.5f));
TriangulateEdgeStrip(m, color1, cell.TerrainTypeIndex, e, color1, cell.TerrainTypeIndex);
TriangulateEdgeFan(center, m, cell.TerrainTypeIndex);
if (!cell.IsUnderwater && !cell.HasRiverThroughEdge(direction))
{
features.AddFeature((center + e.v1 + e.v5) * (1f / 3f), cell);
}
}
void TriangulateOpenWater(HexDirection direction, HexCell cell, HexCell neighbor, Vector3 center)
{
Vector3 c1 = center + HexMetric.GetFirstWaterCorner(direction);
Vector3 c2 = center + HexMetric.GetSecondWaterCorner(direction);
water.AddTriangle(center, c1, c2);
if (direction <= HexDirection.SE && neighbor != null)
{
Vector3 bridge = HexMetric.GetWaterBridge(direction);
Vector3 e1 = c1 + bridge;
Vector3 e2 = c2 + bridge;
water.AddQuad(c1, c2, e1, e2);
if (direction <= HexDirection.E)
{
HexCell nextNeighbor = cell.GetNeighbor(direction.Next());
if (nextNeighbor == null || !nextNeighbor.IsUnderwater)
{
return;
}
water.AddTriangle(
c2, e2, c2 + HexMetric.GetWaterBridge(direction.Next())
);
}
}
}
private void TriangulateCornerCliffTerraces(Vector3 begin, HexCell beginCell, Vector3 left, HexCell leftCell, Vector3 right, HexCell rightCell)
{
float b = 1f / (leftCell.Elevation - beginCell.Elevation);
if (b < 0)
{
b = -b;
}
Vector3 boundary = Vector3.Lerp(HexMetric.Perturb(begin), HexMetric.Perturb(left), b);
Color boundaryColor = Color.Lerp(color1, color2, b);
Vector3 types;
types.x = beginCell.TerrainTypeIndex;
types.y = leftCell.TerrainTypeIndex;
types.z = rightCell.TerrainTypeIndex;
//lower connection
TriangulateBoundaryTriangle(right, color3, begin, color1, boundary, boundaryColor, types);
//upper terrace connection
if (leftCell.GetEdgeType(rightCell) == HexEdgeType.Slope)
{
TriangulateBoundaryTriangle(left, color2, right, color3, boundary, boundaryColor, types);
}
else //upper cliff connection
{
terrain.AddTriangleUnperturbed(HexMetric.Perturb(left), HexMetric.Perturb(right), boundary);
terrain.AddTriangleColor(color2, color3, boundaryColor);
terrain.AddTriangleTerrainTypes(types);
}
}
void TriangulateBoundaryTriangle(Vector3 begin, Color beginColor, Vector3 left, Color leftColor, Vector3 boundary, Color boundaryColor, Vector3 types)
{
Vector3 v2 = HexMetric.Perturb(HexMetric.TerraceLerp(begin, left, 1));
Color c2 = HexMetric.TerraceLerp(beginColor, leftColor, 1);
// first triangle
terrain.AddTriangleUnperturbed(HexMetric.Perturb(begin), v2, boundary);
terrain.AddTriangleColor(beginColor, c2, boundaryColor);
terrain.AddTriangleTerrainTypes(types);
//connect terrace with cliff
for (int i = 2; i < HexMetric.terraceSteps; i++)
{
Vector3 v1 = v2;
Color c1 = c2;
v2 = HexMetric.Perturb(HexMetric.TerraceLerp(begin, left, i));
c2 = HexMetric.TerraceLerp(beginColor, leftColor, i);
terrain.AddTriangleUnperturbed(v1, v2, boundary);
terrain.AddTriangleColor(c1, c2, boundaryColor);
terrain.AddTriangleTerrainTypes(types);
}
//last triangle
terrain.AddTriangleUnperturbed(v2, HexMetric.Perturb(left), boundary);
terrain.AddTriangleColor(c2, leftColor, boundaryColor);
terrain.AddTriangleTerrainTypes(types);
}
void OnEnable()
{
if (!HexMetric.noiseSource)
{
HexMetric.InitializeHashGrid(seed);
HexMetric.noiseSource = noiseSource;
//HexMetric.InitializeHashGrid(seed);
}
}
public void AddTriangle(Vector3 v1, Vector3 v2, Vector3 v4)
{
int vertexIndex = vertices.Count;
vertices.Add(HexMetric.Perturb(v1));
vertices.Add(HexMetric.Perturb(v2));
vertices.Add(HexMetric.Perturb(v4));
triangles.Add(vertexIndex);
triangles.Add(vertexIndex + 1);
triangles.Add(vertexIndex + 2);
}
internal static EdgeVertices TerraceLerp(EdgeVertices a, EdgeVertices b, int step)
{
EdgeVertices result;
result.v1 = HexMetric.TerraceLerp(a.v1, b.v1, step);
result.v2 = HexMetric.TerraceLerp(a.v2, b.v2, step);
result.v3 = HexMetric.TerraceLerp(a.v3, b.v3, step);
result.v4 = HexMetric.TerraceLerp(a.v4, b.v4, step);
result.v5 = HexMetric.TerraceLerp(a.v5, b.v5, step);
return(result);
}
void TriangulateWaterfallInWater(Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4, float y1, float y2, float waterY)
{
v1.y = v2.y = y1;
v3.y = v4.y = y2;
v1 = HexMetric.Perturb(v1);
v2 = HexMetric.Perturb(v2);
v3 = HexMetric.Perturb(v3);
v4 = HexMetric.Perturb(v4);
float t = (waterY - y2) / (y1 - y2);
v3 = Vector3.Lerp(v3, v1, t);
v4 = Vector3.Lerp(v4, v2, t);
rivers.AddQuadUnperturbed(v1, v2, v3, v4);
rivers.AddQuadUV(0f, 1f, 0.8f, 1f);
}
Transform PickPrefab(int level, float hash, float choice)
{
if (level > 0)
{
float[] thresholds = HexMetric.GetFeatureThresholds(level - 1);
for (int i = 0; i < thresholds.Length; i++)
{
if (hash < thresholds[i])
{
return(urbanCollections[i].Pick(choice));
}
}
}
return(null);
}
public void AddFeature(Vector3 position, HexCell cell)
{
HexHash hash = HexMetric.SampleHashGrid(position);
Transform prefab = PickPrefab(cell.UrbanLevel, 0, 0);
if (!prefab)
{
return;
}
Transform instance = Instantiate(prefab);
position.y += instance.localScale.y * 0.5f;
instance.localPosition = HexMetric.Perturb(position);
instance.localRotation = Quaternion.Euler(0f, 360f, 0f);
instance.SetParent(container, false);
}
void TriangulateWaterShore(HexDirection direction, HexCell cell, HexCell neighbor, Vector3 center)
{
EdgeVertices e1 = new EdgeVertices(
center + HexMetric.GetFirstWaterCorner(direction),
center + HexMetric.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 center2 = neighbor.Position;
center2.y = center.y;
EdgeVertices e2 = new EdgeVertices(
center2 + HexMetric.GetSecondSolidCorner(direction.Opposite()),
center2 + HexMetric.GetFirstSolidCorner(direction.Opposite())
);
if (cell.HasRiverThroughEdge(direction))
{
TriangulateEstuary(e1, e2, cell.IncomingRiver == direction);
}
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);
}
HexCell nextNeighbor = cell.GetNeighbor(direction.Next());
if (nextNeighbor != null)
{
Vector3 v3 = nextNeighbor.Position + (nextNeighbor.IsUnderwater ? HexMetric.GetFirstWaterCorner(direction.Previous()) : HexMetric.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));
}
}
internal void Refresh(int newx, int newz)
{
heightNoise = new CoherentNoise.Generation.ValueNoise2D(seed);
temperatureNoise = new CoherentNoise.Generation.ValueNoise2D(seed + 1);
chunkCountX = newx;
chunkCountZ = newz;
UnityEngine.Random.InitState(seed);
//component setup
HexMetric.noiseSource = noiseSource;
HexMetric.InitializeHashGrid(seed);
// set grid size
grid = new HexCell[cellCountX * cellCountZ];
cellCountX = chunkCountX * HexMetric.chunkSizeX;
cellCountZ = chunkCountZ * HexMetric.chunkSizeZ;
CreateChunks();
CreateCells(true);
}
void Triangulate(HexDirection direction, HexCell cell)
{
Vector3 center = cell.Position;
EdgeVertices e = new EdgeVertices(
center + HexMetric.GetFirstSolidCorner(direction),
center + HexMetric.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.HasRiverThroughEdge(direction))
{
features.AddFeature((center + e.v1 + e.v5) * (1f / 3f), cell);
}
}
if (direction <= HexDirection.SE)
{
TriangulateConnection(direction, cell, e);
}
if (cell.IsUnderwater)
{
TriangulateWater(direction, cell, center);
}
}
void TriangulateEdgeTerraces(EdgeVertices begin, HexCell beginCell, EdgeVertices end, HexCell endCell, bool hasRoad)
{
EdgeVertices e2 = EdgeVertices.TerraceLerp(begin, end, 1);
Color c2 = HexMetric.TerraceLerp(color1, color2, 1);
float t1 = beginCell.TerrainTypeIndex;
float t2 = endCell.TerrainTypeIndex;
//first task
TriangulateEdgeStrip(begin, color1, t1, e2, c2, t2, hasRoad);
//process of creating actual steps
for (int i = 2; i < HexMetric.terraceSteps; i++)
{
EdgeVertices e1 = e2;
Color c1 = c2;
e2 = EdgeVertices.TerraceLerp(begin, end, i);
c2 = HexMetric.TerraceLerp(color1, color2, i);
TriangulateEdgeStrip(e1, c1, t1, e2, c2, t2, hasRoad);
}
//last task
TriangulateEdgeStrip(e2, c2, t1, end, color2, t2, hasRoad);
}
void TriangulateCornerTerraces(Vector3 begin, HexCell beginCell, Vector3 left, HexCell leftCell, Vector3 right, HexCell rightCell)
{
Vector3 v3 = HexMetric.TerraceLerp(begin, left, 1);
Vector3 v4 = HexMetric.TerraceLerp(begin, right, 1);
Color c3 = HexMetric.TerraceLerp(color1, color2, 1);
Color c4 = HexMetric.TerraceLerp(color1, color3, 1);
Vector3 types;
types.x = beginCell.TerrainTypeIndex;
types.y = leftCell.TerrainTypeIndex;
types.z = rightCell.TerrainTypeIndex;
terrain.AddTriangle(begin, v3, v4);
terrain.AddTriangleColor(color1, c3, c4);
terrain.AddTriangleTerrainTypes(types);
for (int i = 2; i < HexMetric.terraceSteps; i++)
{
Vector3 v1 = v3;
Vector3 v2 = v4;
Color c1 = c3;
Color c2 = c4;
v3 = HexMetric.TerraceLerp(begin, left, i);
v4 = HexMetric.TerraceLerp(begin, right, i);
c3 = HexMetric.TerraceLerp(color1, color2, i);
c4 = HexMetric.TerraceLerp(color1, color3, i);
terrain.AddQuad(v1, v2, v3, v4);
terrain.AddQuadColor(c1, c2, c3, c4);
terrain.AddQuadTerrainTypes(types);
}
terrain.AddQuad(v3, v4, left, right);
terrain.AddQuadColor(c3, c4, color2, color3);
terrain.AddQuadTerrainTypes(types);
}
void TriangulateConnection(HexDirection direction, HexCell cell, EdgeVertices e1)
{
//Is border cell?
HexCell neighbor = cell.GetNeighbor(direction);
if (neighbor == null)
{
return;
}
//create bridge between cells
Vector3 bridge = HexMetric.GetBridge(direction);
bridge.y = neighbor.Position.y - cell.Position.y;
EdgeVertices e2 = new EdgeVertices(e1.v1 + bridge, e1.v5 + bridge);
if (cell.HasRiverThroughEdge(direction))
{
e2.v3.y = neighbor.StreamBedY;
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);
}
else if (cell.Elevation > neighbor.WaterLevel)
{
TriangulateWaterfallInWater(e1.v2, e1.v4, e2.v2, e2.v4, cell.RiverSurfaceY, neighbor.RiverSurfaceY, neighbor.WaterSurfaceY);
}
}
else if (
!neighbor.IsUnderwater && neighbor.Elevation > cell.WaterLevel)
{
TriangulateWaterfallInWater(e2.v4, e2.v2, e1.v4, e1.v2, neighbor.RiverSurfaceY, cell.RiverSurfaceY, cell.WaterSurfaceY);
}
}
if (cell.GetEdgeType(direction) == HexEdgeType.Slope)
{
TriangulateEdgeTerraces(e1, cell, e2, neighbor, cell.HasRoadThroughEdge(direction));
}
else // cliffs or flat cells
{
TriangulateEdgeStrip(e1, color1, cell.TerrainTypeIndex, e2, color2, cell.TerrainTypeIndex, cell.HasRoadThroughEdge(direction));
}
//create triangle that connects three cells together
HexCell nextNeighbor = cell.GetNeighbor(direction.Next());
if (direction <= HexDirection.E && nextNeighbor != null)
{
Vector3 v5 = e1.v5 + HexMetric.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);
}
}
}
void TriangulateWithRiver(HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e)
{
//outer walls
Vector3 centerL, centerR;
if (cell.HasRiverThroughEdge(direction.Opposite()))
{
centerL = center +
HexMetric.GetFirstSolidCorner(direction.Previous()) * 0.25f;
centerR = center +
HexMetric.GetSecondSolidCorner(direction.Next()) * 0.25f;
}
// sharp turns
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;
}
// two way turns
else if (cell.HasRiverThroughEdge(direction.Next2()))
{
centerL = center;
centerR = center + HexMetric.GetSolidEdgeMiddle(direction.Next()) * (0.5f * HexMetric.innerToOuter);
}
else
{
centerL = center + HexMetric.GetSolidEdgeMiddle(direction.Previous()) * (0.5f * HexMetric.innerToOuter);
centerR = center;
}
//mid point of channel
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;
//fill area
TriangulateEdgeStrip(m, color1, cell.TerrainTypeIndex, e, color1, cell.TerrainTypeIndex);
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);
terrain.AddTriangleColor(color1);
terrain.AddQuadColor(color1);
terrain.AddQuadColor(color1);
terrain.AddTriangleColor(color1);
Vector3 types;
types.x = types.y = types.z = cell.TerrainTypeIndex;
terrain.AddTriangleTerrainTypes(types);
terrain.AddQuadTerrainTypes(types);
terrain.AddQuadTerrainTypes(types);
terrain.AddTriangleTerrainTypes(types);
//river water quads
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 += HexMetric.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 = HexMetric.GetSecondSolidCorner(direction);
}
else
{
if (
!hasRoadThroughEdge &&
!cell.HasRoadThroughEdge(direction.Previous())
)
{
return;
}
corner = HexMetric.GetFirstSolidCorner(direction);
}
roadCenter += corner * 0.5f;
center += corner * 0.25f;
}
else if (cell.IncomingRiver == cell.OutgoingRiver.Previous())
{
roadCenter -= HexMetric.GetSecondCorner(cell.IncomingRiver) * 0.2f;
}
else if (cell.IncomingRiver == cell.OutgoingRiver.Next())
{
roadCenter -= HexMetric.GetFirstCorner(cell.IncomingRiver) * 0.2f;
}
else if (previousHasRiver && nextHasRiver)
{
if (!hasRoadThroughEdge)
{
return;
}
Vector3 offset = HexMetric.GetSolidEdgeMiddle(direction) * HexMetric.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 += HexMetric.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);
}
}
public HexEdgeType GetEdgeType(HexDirection direction)
{
return(HexMetric.GetEdgeType(info.elevation, neighbors[(int)direction].info.elevation));
}
public HexEdgeType GetEdgeType(HexCell otherCell)
{
return(HexMetric.GetEdgeType(info.elevation, otherCell.info.elevation));
}
