private void TriangulateCorner(
Vector3 bottom, VoronoiCell bottomCell,
Vector3 left, VoronoiCell leftCell,
Vector3 right, VoronoiCell rightCell)
{
VoronoiEdgeType leftEdgeType = bottomCell.GetEdgeType(leftCell);
VoronoiEdgeType rightEdgeType = bottomCell.GetEdgeType(rightCell);
if (leftEdgeType == VoronoiEdgeType.Slope)
{
if (rightEdgeType == VoronoiEdgeType.Slope)
{
TriangulateCornerTerraces(bottom, bottomCell, left, leftCell, right, rightCell);
}
else if (rightEdgeType == VoronoiEdgeType.Flat)
{
TriangulateCornerTerraces(left, leftCell, right, rightCell, bottom, bottomCell);
}
else
{
TriangulateCornerTerracesCliff(bottom, bottomCell, left, leftCell, right, rightCell);
}
}
else if (rightEdgeType == VoronoiEdgeType.Slope)
{
if (leftEdgeType == VoronoiEdgeType.Flat)
{
TriangulateCornerTerraces(right, rightCell, bottom, bottomCell, left, leftCell);
}
else
{
TriangulateCornerCliffTerraces(bottom, bottomCell, left, leftCell, right, rightCell);
}
}
else if (leftCell.GetEdgeType(rightCell) == VoronoiEdgeType.Slope)
{
if (leftCell.Elevation < rightCell.Elevation)
{
TriangulateCornerCliffTerraces(right, rightCell, bottom, bottomCell, left, leftCell);
}
else
{
TriangulateCornerTerracesCliff(left, leftCell, right, rightCell, bottom, bottomCell);
}
}
else
{
Terrain.AddTriangle(bottom, left, right);
Terrain.AddTriangleColor(bottomCell.Color, leftCell.Color, rightCell.Color);
}
}
private void TriangulateConnection(VoronoiCell cell, VoronoiDirection direction, EdgeVertices e1)
{
VoronoiCell neighbor = cell.GetNeighbor(direction);
Vector3 bridge = VoronoiMetrics.GetBridge(cell, direction);
EdgeVertices e2 = new EdgeVertices(
e1.V1 + bridge,
e1.V5 + bridge
);
if (cell.HasRiverThroughEdge(direction))
{
e2.V3 = Vector3.ClampMagnitude(e2.V3, neighbor.StreamBedElevation);
TriangulateRiverQuad(e1.V2, e1.V4, e2.V2, e2.V4,
cell.RiverSurfaceElevation, neighbor.RiverSurfaceElevation, 0.8f,
cell.HasIncomingRiver && cell.IncomingRiver == direction
);
}
if (cell.GetEdgeType(direction) == VoronoiEdgeType.Slope)
{
TriangulateEdgeTerraces(e1, cell, e2, neighbor, cell.HasRoadThroughEdge(direction));
}
else
{
TriangulateEdgeStrip(e1, cell.Color, e2, neighbor.Color, cell.HasRoadThroughEdge(direction));
}
VoronoiCell nextNeighbor = cell.GetNeighbor(direction.Next(cell));
if (cell.CornerConnections.Contains(direction))
{
Vector3 v5 = e1.V5 + VoronoiMetrics.GetBridge(cell, direction.Next(cell));
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 TriangulateCornerCliffTerraces(
Vector3 begin, VoronoiCell beginCell,
Vector3 left, VoronoiCell leftCell,
Vector3 right, VoronoiCell rightCell)
{
float b = 1f / (leftCell.Elevation - beginCell.Elevation);
b = b < 0 ? -b : b;
Vector3 boundary = Vector3.Lerp(VoronoiMetrics.Perturb(begin), VoronoiMetrics.Perturb(left), b);
Color boundaryColor = Color.Lerp(beginCell.Color, leftCell.Color, b);
TriangulateBoundaryTriangle(right, rightCell, begin, beginCell, boundary, boundaryColor);
if (leftCell.GetEdgeType(rightCell) == VoronoiEdgeType.Slope)
{
TriangulateBoundaryTriangle(left, leftCell, right, rightCell, boundary, boundaryColor);
}
else
{
Terrain.AddTriangleUnperturbed(VoronoiMetrics.Perturb(left), VoronoiMetrics.Perturb(right), boundary);
Terrain.AddTriangleColor(leftCell.Color, rightCell.Color, boundaryColor);
}
}
