gifAttributes Window

Bring up the Attributes window by checking the menu item ‘Attributes’ in the ‘Windows’ menu.

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The main buttons toggle visibility. They are:

Vertices  png
Edges  png
Cells  png
Hubs  png
Struts  png

Implicitly, this provides an easy way to hide the Primal or Dual.

Some controls are only active in Select Group mode. Examples are given below.

How to set a random colour for all cell groups

1. Choose the Select Group tool in the Toolbar. png
2. Click the Cells button in the Cells group of the Attributes window to make the cells visible. png
3. Click the ‘Select All’ toggle in the Cells group of the Attributes window. The selection turns red.
4. Click the ‘Random Colour’ button in Cells group of the Attributes window. png

The selected groups are assigned a random colour. If ‘Deselect after changing colour’ is checked on the ‘Colours’ tab of the Preferences window, the cells are deselected so you can see the new colours. The colours are presistent across all frequencies, and this provides a way to see the underlying PPTs.

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How to set the line thickness for all edges in a group

1. Choose the Select Group tool. png
2. Click the Edges button in the Edges group of the Attributes window to make the cells visible. png
3. Click the ‘Select All’ toggle in the Edges group of the Attributes window. The selection turns red.
4. Drag the slider to change the thickness of all edges in that group.
5. Click the ‘Select All’ toggle in the Edges group of the Attributes window. The edges are deselected.

GL_POLYGON_MODE

Control the appearance of Hubs and Struts by setting their GL_POLYGON_MODE to GL_FILL, GL_LINE, or GL_POINT.

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When GL_POLYGON_MODE is set to GL_LINE, it is easy to visualize the strut ingress (if set above zero). Note that when using GL_POINT, only the end points of the struts are shown.

Back Face Culling

Back face culling eliminates the rear surface of an element. This can have significant performance benefits as invisible surfaces are never drawn. All front facing polygons have their vertices ordered counter-clockwise. Hence the interior faces have clockwise ordering. This fact is used to determine the rear side of a face. Back face culling simplifies the view, especially when using GL_LINE for “wireframe” rendering.

Culling ON

png Polygons are rendered with GL_FRONT. All the back faces are culled.

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Culling OFF

png Polygons are rendered with GL_BACK_AND_FRONT. All the back faces remain visible.

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Viewing Inside the Sphere

Turn off back face culling when moving the camera inside a sphere, otherwise the interior faces will be invisible. If you select an exterior face on the sphere and hide it, the interior faces will be visible through the hole.

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