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GeoGebra

Three Dimensional Block

Autor:Dr. Doug Davis, 3D

Description

This activity looks at various 2-dimensional projections of a 3-dimensional block. There are several ways to draw or project 3-dimensional objects on a two dimensional view. Opening the style_bar with the button on the top right of the three dimensional view allows several options. The "Chose type of projection" button allows you to select different projection methods. The order of buttons are:
  1. An orthographic view projects the axes at 120o angles.
  2. A perspective view where distances further away appear shorter.
  3. A stereo glasses view showing depth when you ware colored 3D glasses.
  4. An Oblique view projection where 2 axes are drawn with a orthogonal two dimensions and the third direction is at an angle. The home button is useful here to align the view perpendicular to the axes with the three last icons.
Displayed is a block where you can use the sliders to adjust the shape and position of the block. The show path checkbox will display a path to the corner point (x0, y0, z0). The button with a triangle and circular arc will start a rotation animation about the current 'up' direction useful for better visualization. This applet is just to play around with for helping you to visualize three dimensional objects from two-dimensional views.
For investigating more about how to draw three-dimensional objects in various projections see the GeoGebra Book by Shad Hickman at Perspective Drawing

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