Grid Wireframe
selects the data to be drawn as a wireframe model.
Grid Wireframe Hidden Line Removal
will remove the parts of the wireframe that are obscured by other parts of the wireframe.
Grid Triangle Mesh
draws the model as a uniform grid wireframe mesh of triangles.
Grid Gouraud Shaded Gray
selects the data to be drawn a shaded, lighted gray surface.
Grid Texture Map
uses the image data to draw a textured model.
Grid Texture Map with Lights
adds lights to the Texture Map mode.
Grid Gouraud Shaded
draws the model using Gouraud Shading.
Grid Gouraud Shaded with Lights
adds lighting to the Gouraud Shaded mode.
TIN Wireframe
draws the selected Triangulated Irregular Network as a wireframe model.
TIN Gray Surface
draws the selected TIN as a shaded, lighted gray surface.
TIN Texture
draws the TIN as a textured model.
TIN Texture
Lighted draws the TIN as a textured and lighted model.
TIN Gouraud Shaded
draws the TIN using Gouraud Shading.
TIN Gouraud Shaded Lighted
adds lighting to the Gouraud Shaded TIN.
Show View Dependent Tiles
shows the tiles as a red and white checkerboard pattern with the index of tile.
Create TINs
brings up a dialog to allow the user to create Triangulated Irregular Networks. See below.
Select TINs
is a pull-right menu that allows the user to select one of the available TIN models.
Cross Product
is an option used during development to view the points selected by the cross product point selection method.
Peaks and Valleys
is an option used during development to view the points selected by the Peaks and Valleys point selection method.
Wireframe
draws a wireframe on the model's surface in all but wireframe modes. This option does not currently work correctly in Gouraud Shading with Lights.
Stereo
mode will toggle between "stereo-in-a-window" and non-stereo mode when "stereo-in-a-window" has been enabled. See the section of this document titled stereo for more information.
The Create TIN Dialog allows the user to create a triangulated irregular network using the currently selected point resolution. These points can be chosen using one dimensional methods (which pick points along each row and column) or by using a two-dimensional method.
When a one dimensional method is used, the points will be selected and a dialog will appear telling the user how many points were selected prior to creating the triangulation. This allows the user to reselect points if the number is not satisfactory.
After a triangulation has been created with either the one or two dimensional methods, a dialog box will appear that allows the user to name this triangulation. This name will then appear in the Select TINs menu. If the header file is saved, this name will also be used to save the triangulation.
Multiple options can be selected and the algorithm will continue until all paramaters have been satisfied.
One Dimensional Point Selection
Selecting its checkbox enables the one dimensional methods for selection.
Douglas Puecker
This one dimensional point selection method picks points along each row and column using a technique similar to the Douglas Puecker curve fitting algorithm. The text box next to this option is for a value that determines how far a point must be from a line to be selected as significant. These values must be picked via trial and error for each data set.
Cross Product
This one dimensional point selection method picks points along each row and column by looking for the changes in the sign of cross products formed by each group of three adjacent points.
Peaks and Valleys
A peak is a point that is higher than its two adjacent neighbors and a valley is a point that is lower than its two adjacent neighbors. The text box allows subsets of peaks and valleys to be selected. "1" will select all peaks and valleys. "2" will select peaks and valleys from set "1" and so on.
Two Dimensional Point Selection
Selecting its checkbox enable the two dimensional method for point selection. For each parameter a percentage is show at the right side of the dialog that updates as the value in the text box is changed.
Average Error
If this item is enabled the mesh generating algorithm will not stop until the average error of all points is less than the specified value.
Maximum Error
If this item is enabled the mesh generating algorithm will not stop until the point with the maximum error has an error value less than the specified value.
Average Vertical Error
If this item is enabled the mesh generating algorithm will not stop until the average vertical error of all points is less than the specified value.
Maximum Vertical Error
If this item is enabled the mesh generating algorithm will not stop until the point with the maximum vertical error has a vertical error value less than the specified value.
Number of Polygons
If this item is enabled the mesh generating algorithm will stop when the number of polygons is greater than or equal to the specified value.
Number of Vertices
If this item is enabled the mesh generating algorithm will stop when the number of vertices is greater than or equal to the specified value.
Retriangulation Method
After the points in the simplified mesh are determined, the mesh is retriangulated using either the Delauny triangulation method or a Semi-Delauny triangulation.