# Tiger (EntityTopic, 11)

(Difference between revisions)
 Revision as of 19:05, 2 February 2014 (view source)Hayate (Talk | contribs) (reorganise and add info from http://teamikaria.com/hddb/forum/viewtopic.php?p=19375#p19375)← Older edit Revision as of 19:53, 2 February 2014 (view source)Hayate (Talk | contribs) m (toraspherinder -> torisphere, toracubinder -> spheritorus)Newer edit → Line 54: Line 54: {{Tetrashapes}} {{Tetrashapes}} - {{Toratope Nav B|5|6|7|(II)II
Cubinder|((II)II)
Toracubinder|(II)(II)
Duocylinder|((II)(II))
Tiger|(III)I
Spherinder|((III)I)
Toraspherinder|chora}} + {{Toratope Nav B|5|6|7|(II)II
Cubinder|((II)II)
Spheritorus|(II)(II)
Duocylinder|((II)(II))
Tiger|(III)I
Spherinder|((III)I)
Torisphere|chora}}

## Equations

• Variables:
a ⇒ major radius of the tiger in the xy plane
b ⇒ major radius of the tiger in the zw plane
r ⇒ minor radius of the tiger
• All points (x, y, z, w) that lie on the surcell of a tiger will satisfy the following equation:
(√(x2 + y2) − a)2 + (√(z2 + w2) − b)2 = r2
x = a cos(θ1) + r cos(θ1)cos(θ3)
y = a sin(θ1) + r sin(θ1)cos(θ3)
z = b cos(θ2) + r cos(θ2)sin(θ3)
w = b sin(θ2) + r sin(θ2)sin(θ3)
total edge length = Unknown
total surface area = Unknown
surcell volume = Unknown
bulk = Unknown
For realms parallel to one of the axes, they are formed by rotating Cassini ovals around a line parallel with their major axis, and not intersecting the ovals.

## Construction

The tiger could be constructed from a duocylinder similarly to how the torus could be constructed from a cylinder: ExPar: [#img] is obsolete, use [#embed] instead
Diagram created by Keiji, adapted from a sketch from Secret in this forum post.

## Holes

The tiger has one hole, through which a plane can be inserted in two perpendicular orientations, e.g. xy and zw.

This diagram should help in understanding how the tiger works. In each, a long, thin cubinder is being inserted into the tiger. In the top row, the cubinder is oriented in the xy plane. In the bottom row, it's oriented in the zw plane. The tiger is in the same position in all four projections. The red-blue gradiented lines do not appear in the cross-section, but are parts of the tiger which are located in the fourth dimension.

ExPar: [#img] is obsolete, use [#embed] instead

## Cross-sections

Jonathan Bowers aka Polyhedron Dude created these two excellent cross-section renderings: ExPar: [#img] is obsolete, use [#embed] instead ExPar: [#img] is obsolete, use [#embed] instead

 Notable Tetrashapes Regular: pyrochoron • aerochoron • geochoron • xylochoron • hydrochoron • cosmochoron Powertopes: triangular octagoltriate • square octagoltriate • hexagonal octagoltriate • octagonal octagoltriate Circular: glome • cubinder • duocylinder • spherinder • sphone • cylindrone • dicone • coninder Torii: tiger • torisphere • spheritorus • torinder • ditorus