/*
* 连接三角形 针对left right都是梯田的
*/
void TriangulateCornerTerraces(
Vector3 begin, HexCell beginCell,
Vector3 left, HexCell leftCell,
Vector3 right, HexCell rightCell)
{
//在slope-slope-flat类型中，和平台的插值TriangulateEdgeTerraces方法一样
Vector3 v3 = HexMetrics.TerraceLerp(begin, left, 1);
Vector3 v4 = HexMetrics.TerraceLerp(begin, right, 1);
Color c3 = HexMetrics.TerraceLerp(color1, color2, 1);
Color c4 = HexMetrics.TerraceLerp(color1, color3, 1);
//添加地形贴图UV
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 < HexMetrics.terraceSteps; i++)
{
Vector3 v1 = v3;
Vector3 v2 = v4;
Color c1 = c3;
Color c2 = c4;
v3 = HexMetrics.TerraceLerp(begin, left, i);
v4 = HexMetrics.TerraceLerp(begin, right, i);
c3 = HexMetrics.TerraceLerp(color1, color2, i);
c4 = HexMetrics.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 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 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
);
}