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VS3D / VScad3 User's Guide |
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Part 15 - Use a VS3D Relief Surface in VScad3 - continued. Set the main VScad3 mode to "Surface". Set the surface type to "Spherical". Click on "Geometry...". The "Spherical Surface" geometry dialog appears. Click on the "Import Data" button. The file selection dialog appears. Select the same "world.vs3" file used previously, or a modified version of it if you saved one. The "Spherical Radius" list now shows that an array of 720x360 radius (elevation) values have been loaded. Also note that the "Longitude Angle" range is -180,180 and the "Latitude Angle" range is -90,90. These were loaded from the data scale ranges that were saved in the "world.vs3" file. The "Longitude Steps" field is set to 720 and the "Latitude Steps" field is set to 360. These (must) match the dimensions of the radius values array. The "Load From File..." button allows data from simple ASCII format files to be loaded. The "Center" value specifies where to place the center of the sphere. Click on "Ok". Select "Region..." from the main Workspace menu. Click on "Auto Adjust" and then click on "Apply". Change the main mode to "Select". Click on the "Select All" button (there is only one entity - the sphere - and it is now selected). Switch the main mode to "Edit". Select "All..." from the "Attributes..." pull-down menu. This allows you to change all the appearance settings of the sphere at once. Set the color to "Green". Change the Shading type from "Flat" (faceted) to "Gouraud" (smooth). Click on "Apply". Change the main mode to "View" and set the view mode to "Rotate". Click and drag the left mouse button on the sphere to rotate the view in 3D. If your computer is not fast at dynamically rotating the view, you can, instead, click on the "Vector..." button to type in a view rotation angle. Set the main mode back to "Surface". Click on the "Geometry..." button to create another sphere. In the Spherical Surface geometry dialog, type the value 20 in the "Radius" field. Then click on the adjacent "Generate" button. This will generate a 64x64 array of radius values (all with the radius value 20) to create a sphere with 64 facets around the equator and 64 facets around the meridian. Click on "Ok". This will create a black sphere (at approximately sea level), allowing only the continents to show through. Set the main mode to "Select" and click the left mouse button on an exposed portion of the black sphere to select it. Change the main mode to "Edit" and select "Color..." from the Attributes pull-down menu. Set the color to "Blue" and click on "Apply". |
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Guided Tour - Page 28 |
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