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);
}
}
void TriangulateCorner(Vector3 bottom, HexCell bottomCell,
Vector3 left, HexCell leftCell, Vector3 right, HexCell rightCell)
{
HexEdgeType leftEdgeType = bottomCell.GetEdgeType(leftCell);
HexEdgeType rightEdgeType = bottomCell.GetEdgeType(rightCell);
if (leftEdgeType == HexEdgeType.Slope)
{
if (rightEdgeType == HexEdgeType.Slope)
{
TriangulateCornerTerraces(bottom, bottomCell, left,
leftCell, right, rightCell);
}
else if (rightEdgeType == HexEdgeType.Flat)
{
TriangulateCornerTerraces(left, leftCell, right,
rightCell, bottom, bottomCell);
}
else
{
TriangulateCornerTerracesCliff(bottom, bottomCell, left,
leftCell, right, rightCell);
}
}
else if (rightEdgeType == HexEdgeType.Slope)
{
if (leftEdgeType == HexEdgeType.Flat)
{
TriangulateCorner(right, rightCell, bottom,
bottomCell, left, leftCell);
}
else
{
TriangulateCornerCliffTerraces(bottom, bottomCell, left,
leftCell, right, rightCell);
}
}
else if (leftCell.GetEdgeType(rightCell) == HexEdgeType.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(color1, color2, color3);
Vector3 types;
types.x = bottomCell.TerrainTypeIndex;
types.y = leftCell.TerrainTypeIndex;
types.z = rightCell.TerrainTypeIndex;
terrain.AddTriangleTerrainTypes(types);
}
features.AddWall(bottom, bottomCell, left, leftCell, right, rightCell);
}
void TriangulateWithRiver(
HexDirection direction, HexCell cell, Vector3 center, EdgeVertices e
)
{
Vector3 centerL, centerR;
if (cell.HasRiverThroughEdge(direction.Opposite()))
{
centerL = center +
HexMetrics.GetFirstSolidCorner(direction.Previous()) * 0.25f;
centerR = center +
HexMetrics.GetSecondSolidCorner(direction.Next()) * 0.25f;
}
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;
}
else if (cell.HasRiverThroughEdge(direction.Next2()))
{
centerL = center;
centerR = center +
HexMetrics.GetSolidEdgeMiddle(direction.Next()) *
(0.5f * HexMetrics.innerToOuter);
}
else
{
centerL = center +
HexMetrics.GetSolidEdgeMiddle(direction.Previous()) *
(0.5f * HexMetrics.innerToOuter);
centerR = center;
}
center = Vector3.Lerp(centerL, centerR, 0.5f);
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;
TriangulateEdgeStrip(m, color1, (int)cell.TerrainType, e, color1, (int)cell.TerrainType);
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 = (float)cell.TerrainType;
terrain.AddTriangleTerrainTypes(types);
terrain.AddQuadTerrainTypes(types);
terrain.AddQuadTerrainTypes(types);
terrain.AddTriangleTerrainTypes(types);
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
);
}
/*
* 绘制三角形的连接区域
* 根据边界类型调用其他Corner绘制方法
* 每一个三角形都连接3个cell
*
* 颜色对应
* red bottom vertex,
* green left vertex
* blue right vertex
*/
void TriangulateCorner(
Vector3 bottom, HexCell bottomCell,
Vector3 left, HexCell leftCell,
Vector3 right, HexCell rightCell
)
{
HexEdgeType leftEdgeType = bottomCell.GetEdgeType(leftCell);
HexEdgeType rightEdgeType = bottomCell.GetEdgeType(rightCell);
if (leftEdgeType == HexEdgeType.Slope)
{
if (rightEdgeType == HexEdgeType.Slope)
{ //slope-slope-flat,类型
TriangulateCornerTerraces(
bottom, bottomCell, left, leftCell, right, rightCell);
}
//slope-flat-slope,类型（底-左-右）
else if (rightEdgeType == HexEdgeType.Flat)
{
TriangulateCornerTerraces(
left, leftCell, right, rightCell, bottom, bottomCell);
}
//
else
{
TriangulateCornerTerracesCliff(
bottom, bottomCell, left, leftCell, right, rightCell);
}
}
else if (rightEdgeType == HexEdgeType.Slope)
{
if (leftEdgeType == HexEdgeType.Flat)
{
//flat-slope-slope,类型（底-左-右）
TriangulateCornerTerraces(
right, rightCell, bottom, bottomCell, left, leftCell
);
}//The Mirror Cases镜像情况
else
{
TriangulateCornerCliffTerraces(
bottom, bottomCell, left, leftCell, right, rightCell);
}
}
//Double Cliffs，双悬崖情况
else if (leftCell.GetEdgeType(rightCell) == HexEdgeType.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(color1, color2, color3);
//添加地形贴图UV
Vector3 types;
types.x = bottomCell.TerrainTypeIndex;
types.y = leftCell.TerrainTypeIndex;
types.z = rightCell.TerrainTypeIndex;
terrain.AddTriangleTerrainTypes(types);
}
features.AddWall(bottom, bottomCell, left, leftCell, right, rightCell);
}