DD_TERRAIN/exp_AddFlatTriangle.inc at master · jval1972/DD_TERRAIN · GitHub

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  procedure AddFlatTriangle(const iX1, iY1, iX2, iY2, iX3, iY3: integer);
  var
    v1, v2, v3: integer;
    p1, p2, p3: point3d_t;
    l1, l2, l3: integer;
    floorz: integer;
    sec: integer;
  begin
    p1 := GetHeightmapCoords3D(iX1, iY1);
    p2 := GetHeightmapCoords3D(iX2, iY2);
    p3 := GetHeightmapCoords3D(iX3, iY3);
    floorz := (p1.Z + p2.Z + p3.Z) div 3;
    sec := AddSector(floorz, options.defceilingheight, False);
    v1 := AddVertex(p1.X, -p1.Y);
    v2 := AddVertex(p2.X, -p2.Y);
    v3 := AddVertex(p3.X, -p3.Y);
    l1 := AddLinedef(v1, v2);
    l2 := AddLinedef(v2, v3);
    l3 := AddLinedef(v3, v1);
    if doomlinedefs[l1].sidenum[0] < 0 then
      doomlinedefs[l1].sidenum[0] := AddSidedef(sec)
    else
    begin
      doomlinedefs[l1].sidenum[1] := AddSidedef(sec);
      doomlinedefs[l1].flags := doomlinedefs[l1].flags and not ML_BLOCKING;
      doomlinedefs[l1].flags := doomlinedefs[l1].flags or ML_TWOSIDED;
    end;
    if doomlinedefs[l2].sidenum[0] < 0 then
      doomlinedefs[l2].sidenum[0] := AddSidedef(sec)
    else
    begin
      doomlinedefs[l2].sidenum[1] := AddSidedef(sec);
      doomlinedefs[l2].flags := doomlinedefs[l2].flags and not ML_BLOCKING;
      doomlinedefs[l2].flags := doomlinedefs[l2].flags or ML_TWOSIDED;
    end;
    if doomlinedefs[l3].sidenum[0] < 0 then
      doomlinedefs[l3].sidenum[0] := AddSidedef(sec)
    else
    begin
      doomlinedefs[l3].sidenum[1] := AddSidedef(sec);
      doomlinedefs[l3].flags := doomlinedefs[l3].flags and not ML_BLOCKING;
      doomlinedefs[l3].flags := doomlinedefs[l3].flags or ML_TWOSIDED;
    end;
  end;