void AddHalfCell(SquareCell cell, GridDirection direction, Vector3 centre, Vector3 v0, Vector3 v1, Vector3 v2, Vector3 va, Vector3 vb, Vector3 vc, Vector3 vd, Vector3 vx, Vector3 vy, Vector3 vz)
{
Vector3 riverbed = centre + Vector3.up * (cell.CentreElevation + GridMetrics.streamBedElevationOffset) * GridMetrics.elevationStep;
Vector3 midSolidEdgePrev = centre + GridMetrics.GetSolidEdge(direction.Previous()) + Vector3.up * (cell.CentreElevation + GridMetrics.streamBedElevationOffset) * GridMetrics.elevationStep;
Vector3 midSolidEdgeNext = centre + GridMetrics.GetSolidEdge(direction.Next()) + Vector3.up * (cell.CentreElevation + GridMetrics.streamBedElevationOffset) * GridMetrics.elevationStep;
SquareCell neighborPrev = cell.GetNeighbor(direction.Previous()) ?? cell;
SquareCell neighborNext = cell.GetNeighbor(direction.Next()) ?? cell;
Vector3 midEdgePrev = centre + GridMetrics.GetEdge(direction.Previous()) + Vector3.up * ((cell.CentreElevation + neighborPrev.CentreElevation) / 2 + GridMetrics.streamBedElevationOffset) * GridMetrics.elevationStep;
Vector3 midEdgeNext = centre + GridMetrics.GetEdge(direction.Next()) + Vector3.up * ((cell.CentreElevation + neighborNext.CentreElevation) / 2 + GridMetrics.streamBedElevationOffset) * GridMetrics.elevationStep;
if (cell.HasRiver)
{
if (cell.HasRiverThroughEdge(direction.Previous()))
{
terrain.AddTriangle(v0, midSolidEdgePrev, riverbed); // split tri into two tris
terrain.AddTriangle(midSolidEdgePrev, v1, riverbed);
}
else
{
terrain.AddTriangle(v0, v1, riverbed);
} // edge with no river
if (cell.HasRiverThroughEdge(direction.Next()))
{
terrain.AddTriangle(v1, midSolidEdgeNext, riverbed); // split tri into two tris
terrain.AddTriangle(midSolidEdgeNext, v2, riverbed);
}
else
{
terrain.AddTriangle(v1, v2, riverbed);
} // edge with no river
}
else
{
terrain.AddTriangle(v0, v1, v2);
}
if (cell.HasRiverThroughEdge(direction.Next()))
{
terrain.AddQuad(v1, va, midEdgeNext, midSolidEdgeNext);
terrain.AddQuad(midSolidEdgeNext, midEdgeNext, vb, v2);
}
else
{
terrain.AddQuad(v1, va, vb, v2);
} // top Edge
if (cell.HasRiverThroughEdge(direction.Previous()))
{
terrain.AddQuad(v1, midSolidEdgePrev, midEdgePrev, vd);
terrain.AddQuad(midSolidEdgePrev, v0, vc, midEdgePrev);
}
else
{
terrain.AddQuad(v1, v0, vc, vd);
} // left Edge
if (cell.HasRiverThroughEdge(direction))
{
}
else
{
terrain.AddQuad(v1, vd, vx, va);
} // direction edge
if (cell.HasRiverThroughEdge(direction.Next2()))
{
}
else
{
terrain.AddQuad(v2, vb, vy, vz);
} // clockwise edge
AddColors(cell, direction);
if (cell.HasRoadThroughEdge(direction.Next()))
{
midEdgeNext = centre + GridMetrics.GetEdge(direction.Next()) + Vector3.up * ((int)cell.GridElevations[direction] + (int)cell.GridElevations[direction.Next2()]) / 2 * GridMetrics.elevationStep;
midSolidEdgeNext = centre + GridMetrics.GetSolidEdge(direction.Next()) + Vector3.up * ((int)cell.GridElevations[direction] + (int)cell.GridElevations[direction.Next2()]) / 2 * GridMetrics.elevationStep;
TriangulateRoadSegment(v1, midSolidEdgeNext, v2, va, midEdgeNext, vb);
}
if (cell.HasRoadThroughEdge(direction.Previous()))
{
midEdgePrev = centre + GridMetrics.GetEdge(direction.Previous()) + Vector3.up * ((int)cell.GridElevations[direction] + (int)cell.GridElevations[direction.Previous2()]) / 2 * GridMetrics.elevationStep;
midSolidEdgePrev = centre + GridMetrics.GetSolidEdge(direction.Previous()) + Vector3.up * ((int)cell.GridElevations[direction] + (int)cell.GridElevations[direction.Previous2()]) / 2 * GridMetrics.elevationStep;
TriangulateRoadSegment(v0, midSolidEdgePrev, v1, vc, midEdgePrev, vd);
}
}
void AddMeshForSquare(SquareCell cell)
{
Vector3 centre = cell.transform.localPosition;
Vector3 verticleCentre = centre + Vector3.up * cell.CentreElevation * GridMetrics.elevationStep;
Vector3 vb0 = centre + GridMetrics.GetEdge(GridDirection.SW);
Vector3 vb1 = centre + GridMetrics.GetEdge(GridDirection.NW);
Vector3 vb2 = centre + GridMetrics.GetEdge(GridDirection.NE);
Vector3 vb3 = centre + GridMetrics.GetEdge(GridDirection.SE);
vb0 = vb0 + Vector3.up * (cell.GridElevations.Y0) * GridMetrics.elevationStep;
vb1 = vb1 + Vector3.up * (cell.GridElevations.Y1) * GridMetrics.elevationStep;
vb2 = vb2 + Vector3.up * (cell.GridElevations.Y2) * GridMetrics.elevationStep;
vb3 = vb3 + Vector3.up * (cell.GridElevations.Y3) * GridMetrics.elevationStep;
Vector3 vs0 = centre + GridMetrics.GetSolidEdge(GridDirection.SW);
Vector3 vs1 = centre + GridMetrics.GetSolidEdge(GridDirection.NW);
Vector3 vs2 = centre + GridMetrics.GetSolidEdge(GridDirection.NE);
Vector3 vs3 = centre + GridMetrics.GetSolidEdge(GridDirection.SE);
Vector3 bridgeW = GridMetrics.GetBridge(GridDirection.W);
Vector3 bridgeN = GridMetrics.GetBridge(GridDirection.N);
Vector3 bridgeE = GridMetrics.GetBridge(GridDirection.E);
Vector3 bridgeS = GridMetrics.GetBridge(GridDirection.S);
Vector3 vS0 = vs0 + bridgeS + GetVertexBlendElevation(cell.GridElevations, GridDirection.SW, GridDirection.S);
Vector3 vW0 = vs0 + bridgeW + GetVertexBlendElevation(cell.GridElevations, GridDirection.SW, GridDirection.W);
Vector3 vN1 = vs1 + bridgeN + GetVertexBlendElevation(cell.GridElevations, GridDirection.NW, GridDirection.N);
Vector3 vW1 = vs1 + bridgeW + GetVertexBlendElevation(cell.GridElevations, GridDirection.NW, GridDirection.W);
Vector3 vN2 = vs2 + bridgeN + GetVertexBlendElevation(cell.GridElevations, GridDirection.NE, GridDirection.N);
Vector3 vE2 = vs2 + bridgeE + GetVertexBlendElevation(cell.GridElevations, GridDirection.NE, GridDirection.E);
Vector3 vE3 = vs3 + bridgeE + GetVertexBlendElevation(cell.GridElevations, GridDirection.SE, GridDirection.E);
Vector3 vS3 = vs3 + bridgeS + GetVertexBlendElevation(cell.GridElevations, GridDirection.SE, GridDirection.S);
if (cell.GridElevations.Y0 == cell.GridElevations.Y2) // keep diagonals level
{
vs0 += Vector3.up * (cell.GridElevations.Y0) * GridMetrics.elevationStep;
vs1 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.NW);
vs2 += Vector3.up * (cell.GridElevations.Y2) * GridMetrics.elevationStep;
vs3 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.SE);
}
else if (cell.GridElevations.Y1 == cell.GridElevations.Y3)
{
vs0 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.SW);
vs1 += Vector3.up * (cell.GridElevations.Y1) * GridMetrics.elevationStep;
vs2 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.NE);
vs3 += Vector3.up * (cell.GridElevations.Y3) * GridMetrics.elevationStep;
}
else
{
vs0 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.SW);
vs1 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.NW);
vs2 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.NE);
vs3 += GetDoubleVertexBlendElevation(cell.GridElevations, GridDirection.SE);
}
// Works out which diagonal to add
if (cell.GridElevations.Y0 == cell.GridElevations.Y2 || Mathf.Abs(cell.GridElevations.Y0 - cell.GridElevations.Y2) < Mathf.Abs(cell.GridElevations.Y1 - cell.GridElevations.Y3)) // sets direction of the triangle pairs in the quad
{
AddHalfCell(cell, GridDirection.NW, centre, vs0, vs1, vs2, vN1, vN2, vW0, vW1, vb1, vb2, vE2);
AddHalfCell(cell, GridDirection.SE, centre, vs2, vs3, vs0, vS3, vS0, vE2, vE3, vb3, vb0, vW0);
}
else
{
AddHalfCell(cell, GridDirection.SW, centre, vs3, vs0, vs1, vW0, vW1, vS3, vS0, vb0, vb1, vN1);
AddHalfCell(cell, GridDirection.NE, centre, vs1, vs2, vs3, vE2, vE3, vN1, vN2, vb2, vb3, vS3);
}
if (cell.HasRoads)
{
TriangulateRoadCentre(cell, verticleCentre, vs0, vs1, vs2, vs3);
}
if (cell.HasRiver)
{
if (cell.HasRiverThroughEdge(GridDirection.N))
{
TriangulateWithRiver(GridDirection.N, cell, centre, vs1, vb1, vb2, vs2, 0f);
}
else
{
TriangulateWithRiver(GridDirection.N, cell, centre, vs1, vb1, vb2, vs2, 0f);
}
if (cell.HasRiverThroughEdge(GridDirection.E))
{
TriangulateWithRiver(GridDirection.E, cell, centre, vs2, vb2, vb3, vs3, 0.5f);
}
else
{
TriangulateWithRiver(GridDirection.E, cell, centre, vs2, vb2, vb3, vs3, 0.5f);
}
if (cell.HasRiverThroughEdge(GridDirection.S))
{
TriangulateWithRiver(GridDirection.S, cell, centre, vs3, vb3, vb0, vs0, 1f);
}
else
{
TriangulateWithRiver(GridDirection.S, cell, centre, vs3, vb3, vb0, vs0, 1f);
}
if (cell.HasRiverThroughEdge(GridDirection.W))
{
TriangulateWithRiver(GridDirection.W, cell, centre, vs0, vb0, vb1, vs1, 0.5f);
}
else
{
TriangulateWithRiver(GridDirection.W, cell, centre, vs0, vb0, vb1, vs1, 0.5f);
}
}
if (cell.IsUnderwater)
{
AddWaterForSquare(cell, centre);
}
if (!cell.IsUnderwater && !cell.HasRoads)
{
features.AddFeature(cell, verticleCentre);
}
}
