Position of FaceGrids planes in Graphics3D

Question

What is the position of FaceGrids used in Graphics3D? The example below suggests it is at a depth around 2% of the plot box. Cuboid at 0.1 sits below the grid, cuboid at 0.3 sits above and the one at 0.2 blends with the grid partially. Interestingly, the cuboids at 0.1 or 0.2 are hovering above the grid plabe even though the grid is drawn over them. Can I fix this? Can I place the FaceGrids at the very edge of the plot, i.e. at 0? Version 14.1, MacOS

Graphics3D[
 {
  Cuboid[{3, 3, 0.1}, {7, 7, 0.1}],
  Cuboid[{3, 0.2, 3}, {7, 0.2, 7}],
  Cuboid[{0.3, 3, 3}, {0.3, 7, 7}],
  Sphere[{5, 5, 5}, 2]
  },
 Boxed -> False,
 PlotRange -> {{0, 10}, {0, 10}, {0, 10}},
 ViewPoint -> {1, 1, 1},
 Lighting -> "Neutral",
 FaceGrids -> 
  Table[{face, {Range[0, 10, 1], 
     Range[0, 10, 1]}}, {face, -IdentityMatrix[3]}]
]

Answer 1

Oftentimes, weird overlapping artifacts in Graphics3D come from the Z-fighting. The first trick in the book is to change the "3DRenderingMethod" in RenderingOptions to one of the more accurate methods, such as "BSPTree":

Style[Graphics3D[...], RenderingOptions -> {"3DRenderingMethod" -> "BSPTree"}]