A339468
The number of n-faced polyhedra formed when a truncated tetrahedron is internally cut by all the planes defined by any three of its vertices.
Original entry on oeis.org
4818, 4596, 2454, 816, 246, 60, 0, 0, 9
Offset: 4
The truncated tetrahedron has 12 vertices, 18 edges and 4 faces (4 equilateral triangles and 4 hexagons). It is cut by 82 internal planes defined by any three of its vertices, resulting in the creation of 12999 polyhedra. No polyhedra with 10, 11, or 13 or more faces are created.
- Hyung Taek Ahn and Mikhail Shashkov, Geometric Algorithms for 3D Interface Reconstruction.
- Scott R. Shannon, Image showing the 82 internal plane cuts on the external edges and faces.
- Scott R. Shannon, Image of the 4818 4-faced polyhedra.
- Scott R. Shannon, Image of the 4596 5-faced polyhedra.
- Scott R. Shannon, Image of the 2454 6-faced polyhedra.
- Scott R. Shannon, Image of the 816 7-faced polyhedra.
- Scott R. Shannon, Image of the 246 8-faced polyhedra. None of these are visible on the surface.
- Scott R. Shannon, Image of the 60 9-faced polyhedra. None of these are visible on the surface.
- Scott R. Shannon, Image of the 9 12-faced polyhedra. None of these are visible on the surface.
- Scott R. Shannon, Image of all 12999 polyhedra. The polyhedra are colored red, orange, yellow, green for face counts 4 to 7 respectively. The polyhedra with 8, 9 and 12 faces are not visible on the surface.
- Scott R. Shannon, Image of all 12999 polyhedra, exploded. Each polyhedron has been moved away from the origin by a distance proportional to the average distance of its vertices from the origin. Some of the 8-, 9- and 12-faced polyhedra can now be seen.
- Eric Weisstein's World of Mathematics, Truncated Tetrahedron.
- Wikipedia, Truncated tetrahedron.
A339538
Irregular table read by rows: The number of k-faced polyhedra, where k>=4, created when an elongated n-bipyramid, with faces that are squares and equilateral triangles, is internally cut by all the planes defined by any three of its vertices.
Original entry on oeis.org
258, 336, 60, 424, 584, 208, 48, 8, 8830, 16090, 12210, 5040, 1210, 260, 80, 10
Offset: 3
The elongated 5-bipyramid has 12 vertices, 25 edges and 15 faces (5 squares and 10 equilateral triangles). It is cut by 112 internal planes defined by any three of its vertices, resulting in the creation of 43730 polyhedra.
The 11 faced polyhedra are unusual in that all 10 are visible on the surface; most polyhedra cut with their own planes have the resulting polyhedra with the most faces near the center of the original polyhedra and are thus not visible on its surface.
No polyhedra with 12 or more faces are created.
The table is:
258, 336, 60;
424, 584, 208, 48, 8;
8830, 16090, 12210, 5040, 1210, 260, 80, 10;
- Hyung Taek Ahn and Mikhail Shashkov, Geometric Algorithms for 3D Interface Reconstruction.
- Scott R. Shannon, Elongated 3-bypyramid, showing the 29 plane cuts on the external edges and faces.
- Scott R. Shannon, Elongated 3-bypyramid, showing the 258 4-faced polyhedra.
- Scott R. Shannon, Elongated 3-bypyramid, showing all 654 polyhedra post cutting. The polyhedra are colored red,orange,yellow for face counts 4 to 6 respectively. No 6-faced polyhedra are visible on the surface.
- Scott R. Shannon, Elongated 3-bypyramid, showing all 654 polyhedra post cutting and exploded. Each piece has been moved away from the origin by a distance proportional to the average distance of its vertices from the origin. The 6-faced polyhedra can now be seen.
- Scott R. Shannon, Elongated 4-bypyramid, showing the 40 plane cuts on the external edges and faces.
- Scott R. Shannon, Elongated 4-bypyramid, showing the 424 4-faced polyhedra.
- Scott R. Shannon, Elongated 4-bypyramid, showing the 48 7-faced polyhedra.
- Scott R. Shannon, Elongated 4-bypyramid, showing all 1272 polyhedra post cutting. The polyhedra are colored red,orange,yellow,green,blue for face counts 4 to 8 respectively.
- Scott R. Shannon, Elongated 4-bypyramid, showing all 1272 polyhedra post cutting and exploded.
- Scott R. Shannon, Elongated 5-bypyramid, showing the 112 plane cuts on the external edges and faces.
- Scott R. Shannon, Elongated 5-bypyramid, showing the 8830 4-faced polyhedra. This contains very small polyhedra near the peaks of the pyramids due to the convergence of the cutting lines near these points.
- Scott R. Shannon, Elongated 5-bypyramid, showing the 8830 4-faced polyhedra viewed from above.
- Scott R. Shannon, Elongated 5-bypyramid, showing the 1210 8-faced polyhedra viewed from above.
- Scott R. Shannon, Elongated 5-bypyramid, showing all 43730 polyhedra post cutting. The polyhedra are colored red,orange,yellow,green,blue.indigo,violet,light-blue for face counts 4 to 11 respectively.
- Scott R. Shannon, Elongated 5-bypyramid, showing all 43730 polyhedra post cutting and exploded.
- Eric Weisstein's World of Mathematics, Elongated Square Dipyramid.
- Eric Weisstein's World of Mathematics, Johnson Solid.
- Wikipedia, Elongated bipyramid.
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