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Impossible Geometry Library

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Matías Gárate edited this page Jun 27, 2020 · 9 revisions

This section described the impossible objects available in the addon, and the common options that you can adjust upon creation.

Operator Options

Geometry Parameters

  • Size/Height/Width: Characteristic proportions of the figure.
  • Thickness: Thickness of the figure sides.
  • Scale: Modify the thickness in the X, Y, Z axis to get different structures.

Camera-Object Alignment

  • Align - Camera-to-Object: Aligns the active camera rotation to match the object optical illusion.
  • Align - Object-to-Camera: Aligns the object rotation, so that the optical illusion is visible by the active camera.
  • Tilt: Rotates the object around the camera line of sight.

Illusion Alignment

This refers to the "relative angles between the camera and the illusion object to see the optical illusion". By default the object proportions are constructed to be visible from the "Isometric Perspective", with these options, you can construct objects that are visible from other "Axonometric Perspectives" by adjusting its proportions.

  • Isometric: The optical illusion will be visible from an Isometric Camera (i.e. an ortographic camera with rotation [54.736°, 0°, 45°]).
  • Axonometric: The optical illusion will be visible from an Axonometric Camera (i.e. an ortographic camera with rotation [X°, 0°, Z°]). The user can select the X° and Z° angles.
  • Camera: It will adjust the object proportions, so that it is visible by the current camera orientation. This is different to the alignment tools from the previous section.

Impossible Geometry Library

Here you can find the default aspect of the impossible geometry figures included in this addon. More figures comming soon

Penrose Triangle First discovered by Oskar Reutersvard, and then by Penrose & Penrose (1958). It is also the base shape of the "Waterfall" by M.C. Escher.

Penrose Stair Also shown by Penrose & Penrose (1958) in the article: "Impossible objects: A special type of visual illusion", and the base shape behind "Ascending and Descending" from M.C. Escher.

Reutersvard Rectangle

Impossible Arch

Impossible Cube This particular figure can only be seen from the Isometric perspective, as the illusion requires for two of the ooposing edges to be aligned.

User Guide

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