Note: on some Mac systems, the plug-in must be installed before you access the VRML pages or the system will crash.

Download the Cortona VRML plug-in for your OS here:
http://www.parallelgraphics.com/products/cortona/

Plug-in Setup for PC (best visuals)
1. right click and select 'Preferences'
2. select 'Renderer' tab and choose DirectX Renderer
3. [tick under Renderer options] *Anti-aliasing: real-time *Textures: optimize for quality *Textures: use mip-mapping *Optimization: Intel Pentium III+ *Renderer version : Concorde DX7.

Plug-in Setup for Mac (best visuals)
1. left click-hold to bring up preferences menu.
2. [tick under Renderer Hints] *optimize textures for quality *antialias geometry edges *use textures mip-mapping.

Basic Navigation in Cortona
1. select 'study' button (left middle)
2. select 'fit' button (bottom right)
3. select 'plan' button (left middle), then zoom back a bit with the mouse (left click-hold & drag back)
4. select 'turn' button (left middle), then start playing around
*. if you want to re-start, select 'restore' button (bottom right).