private void TriangulateCorner(
Vector3 bottom, HexCell bottomCell,
Vector3 left, HexCell leftCell,
Vector3 right, HexCell rightCell)
{
var leftEdge = bottomCell.GetEdgeType(leftCell);
var rightEdge = bottomCell.GetEdgeType(rightCell);
if (leftEdge == HexEdgeType.Slope)
{
if (rightEdge == HexEdgeType.Slope) // SSF: slope-slope-flat
{
TriangulateCornerTerraces(bottom, bottomCell, left, leftCell, right, rightCell);
}
else if (rightEdge == HexEdgeType.Flat) // SFS: slope-flat-slope
{
TriangulateCornerTerraces(left, leftCell, right, rightCell, bottom, bottomCell);
}
else
{
TriangulateCornerTerracesCliff(bottom, bottomCell, left, leftCell, right, rightCell);
}
}
else if (rightEdge == HexEdgeType.Slope)
{
if (leftEdge == HexEdgeType.Flat) // FSS: flat-slope-slope
{
TriangulateCornerTerraces(right, rightCell, bottom, bottomCell, left, leftCell);
}
else // must be a cliff, as left as slope has already been covered
{
TriangulateCornerCliffTerraces(bottom, bottomCell, left, leftCell, right, rightCell);
}
}
else if (leftCell.GetEdgeType(rightCell) == HexEdgeType.Slope) // both sides are cliffs, top is slope
{
if (leftCell.Elevation < rightCell.Elevation)
{
TriangulateCornerCliffTerraces(right, rightCell, bottom, bottomCell, left, leftCell); // CCSR: cliff, cliff, slope to right
}
else
{
TriangulateCornerTerracesCliff(left, leftCell, right, rightCell, bottom, bottomCell); // CCSL: cliff, cliff, slope to left
}
}
else // no terraces anywhere, so a simple triangle will do
{
Terrain.AddTriangle(bottom, left, right);
var indices = new Vector3(bottomCell.Index, leftCell.Index, rightCell.Index);
Terrain.AddTriangleCellData(indices, weights1, weights2, weights3);
}
Features.AddWall(bottom, bottomCell, left, leftCell, right, rightCell);
}
private void TriangulateCornerCliffTerraces(
Vector3 bottom, HexCell bottomCell,
Vector3 left, HexCell leftCell,
Vector3 right, HexCell rightCell)
{
var b = Mathf.Abs(1f / (leftCell.Elevation - bottomCell.Elevation));
var boundary = Vector3.Lerp(HexMetrics.Perturb(bottom), HexMetrics.Perturb(left), b);
var boundaryWeights = Color.Lerp(weights1, weights2, b);
var indices = new Vector3(bottomCell.Index, leftCell.Index, rightCell.Index);
TriangulateBoundaryTriangle(right, weights1, bottom, weights2, boundary, boundaryWeights, indices);
if (rightCell.GetEdgeType(leftCell) == HexEdgeType.Slope)
{
TriangulateBoundaryTriangle(left, weights2, right, weights3, boundary, boundaryWeights, indices);
return;
}
Terrain.AddTriangleUnperturbed(HexMetrics.Perturb(left), HexMetrics.Perturb(right), boundary);
Terrain.AddTriangleCellData(indices, weights2, weights3, boundaryWeights);
}
