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Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Because the multiple-polygon form of Polygon (presently?) renders without antialiasing by default this also works:

Graphics[{Polygon[{{{0, 0}, {1, 0}, {0, 1}}, {{1, 0}, {0, 1}, {1, 1}}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?

Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Because the multiple-polygon form of Polygon (presently?) renders without antialiasing by default this also works:

Graphics[{Polygon[{{{0, 0}, {1, 0}, {0, 1}}, {{1, 0}, {0, 1}, {1, 1}}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?

Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Because the multiple-polygon form of Polygon (presently?) renders without antialiasing this also works:

Graphics[{Polygon[{{{0, 0}, {1, 0}, {0, 1}}, {{1, 0}, {0, 1}, {1, 1}}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?

Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Because the multiple-polygon form of Polygon (presently?) renders without antialiasing by default this also works:

Graphics[{Polygon[{{{0, 0}, {1, 0}, {0, 1}}, {{1, 0}, {0, 1}, {1, 1}}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?

Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?

Antialiasing -> False will do it, which surprisingly can be used in-line as a directive:

Graphics[{Antialiasing -> False, Polygon[{{0, 0}, {1, 0}, {0, 1}}], 
  Polygon[{{1, 0}, {0, 1}, {1, 1}}]}]

Because the multiple-polygon form of Polygon (presently?) renders without antialiasing this also works:

Graphics[{Polygon[{{{0, 0}, {1, 0}, {0, 1}}, {{1, 0}, {0, 1}, {1, 1}}}]}]

Reference:

• Anti-aliasing with the multiple-object form of Polygon?