/// <summary>
/// Generate a single triangle for the given verticies
/// and automatically add it to the list
/// </summary>
/// <param name="v1">Vertex 1</param>
/// <param name="v2">Vertex 2</param>
/// <param name="v3">Vertex 3</param>
public void AddTriangle(Vector3 v1, Vector3 v2, Vector3 v3)
{
int vertexIndex = vertices.Count;
vertices.Add(HexMetrics.Perturb(v1));
vertices.Add(HexMetrics.Perturb(v2));
vertices.Add(HexMetrics.Perturb(v3));
triangles.Add(vertexIndex);
triangles.Add(vertexIndex + 1);
triangles.Add(vertexIndex + 2);
}
private 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 = HexMetrics.Perturb(v1);
v2 = HexMetrics.Perturb(v2);
v3 = HexMetrics.Perturb(v3);
v4 = HexMetrics.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);
}
private void TriangulateCornerCliffTerraces(Vector3 begin, HexCell beginCell,
Vector3 left, HexCell leftCell, Vector3 right, HexCell rightCell)
{
float b = Mathf.Abs(1f / (leftCell.Elevation - beginCell.Elevation));
Vector3 boundary = Vector3.Lerp(HexMetrics.Perturb(begin), HexMetrics.Perturb(left), b);
Color boundaryColor = Color.Lerp(beginCell.Color, leftCell.Color, b);
TriangulateBoundaryTriangle(right, rightCell, begin, beginCell, boundary, boundaryColor);
if (leftCell.GetEdgeType(rightCell) == HexEdgeType.Slope)
{
TriangulateBoundaryTriangle(left, leftCell, right, rightCell, boundary, boundaryColor);
}
else
{
terrain.AddTriangleUnperturbed(HexMetrics.Perturb(left), HexMetrics.Perturb(right), boundary);
terrain.AddTriangleColor(leftCell.Color, rightCell.Color, boundaryColor);
}
}
private void TriangulateBoundaryTriangle(Vector3 begin, HexCell beginCell,
Vector3 left, HexCell leftCell, Vector3 boundary, Color boundaryColor)
{
Vector3 v2 = HexMetrics.Perturb(HexMetrics.TerraceLerp(begin, left, 1));
Color c2 = HexMetrics.TerraceLerp(beginCell.Color, leftCell.Color, 1);
terrain.AddTriangleUnperturbed(HexMetrics.Perturb(begin), v2, boundary);
terrain.AddTriangleColor(beginCell.Color, c2, boundaryColor);
for (int i = 2; i < HexMetrics.terraceSteps; i++)
{
Vector3 v1 = v2;
Color c1 = c2;
v2 = HexMetrics.Perturb(HexMetrics.TerraceLerp(begin, left, i));
c2 = HexMetrics.TerraceLerp(beginCell.Color, leftCell.Color, i);
terrain.AddTriangleUnperturbed(v1, v2, boundary);
terrain.AddTriangleColor(c1, c2, boundaryColor);
}
terrain.AddTriangleUnperturbed(v2, HexMetrics.Perturb(left), boundary);
terrain.AddTriangleColor(c2, leftCell.Color, boundaryColor);
}