This activity looks at various 2-dimensional projections of a 3-dimensional block.[br][br]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.[br]The "Chose type of projection" button allows you to select different projection methods. The order of buttons are:[br][list=1][*]An orthographic view projects the axes at 120[sup]o[/sup] angles.[/*][*]A perspective view where distances further away appear shorter.[br][/*][*]A stereo glasses view showing depth when you ware colored 3D glasses.[/*][*]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.[/*][/list][br]Displayed is a block where you can use the sliders to adjust the shape and position of the block.[br]The show path checkbox will display a path to the corner point (x[sub]0[/sub], y[sub]0[/sub], z[sub]0[/sub]).[br]The button with a triangle and circular arc will start a rotation animation about the current 'up' direction useful for better visualization.[br][br]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 [url=https://www.geogebra.org/u/mrhickman]Shad Hickman[/url] at [url=https://www.geogebra.org/m/FzXgKbKQ]Perspective Drawing[/url]