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This Web site is dedicated to the thousands of "users" of my programs, those who have helped test my programs over the last 25 or so years, and especially those who shared their experiences with me.

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SECTION: 4.20 is for some information and illustrations relating to example images of the various Display Modes that affect the way drawing elements are displayed.

The Perspective Display Modes relate to the way the lines and edges of the triangle elements are colored in and outlined. The Perspective Display Modes also control how line elements, triangle elements, or mixed elements will be processed for display.

See Section: 3.1.25.0 for a detailed discussion of issues relating to Perspective Display Modes, Printing Display Modes, and other issues related to this Section.

The Stereoscopic Display Modes relate to the way the right and left eye views will be formatted for display. Different stereoscopic viewing methods require different formatting of the two images, these formatting options are controlled through a code number. Various other values are associated with each formatting code number so as to optimize the display for each Stereoscopic Display Mode, and its relation to the particular elements being displayed. The Perspective Display Mode selected affects the appearance of the images used for the Stereoscopic Display Formatting, i.e. you can use all of the Perspective Display Modes with any of the Stereoscopic Display Modes giving a large variety of combinations, only some of which would be of interest generally.

See Section: 3.3.7.8 for a detailed discussion of issues relating to Stereoscopic Viewing Methods, Anaglyph glasses, and other issues related to this Section.

The modes available and the images they produce may be altered in other program revisions, so the images generated by the program version you have may not match the illustrations shown here. Variations in the code used in different program, revisions and versions can affect the results, so you should not expect the same results from different versions and revisions of the programs. The Author reserves the right to make any kind of changes at any time without notice.

Some Browsers may not display the larger size illustrations properly, so you may only be able to view the smaller sizes of each illustration. You should turn off the shrink-to-fit feature in your browser, if it has one, since that can distort or degrade the illustrations or make thin lines disappear.

Series 10 Perspective Display Modes includes modes within the range 10 through 19, although not all of the mode numbers in this range are in use as of the initial release of v3.7L. The different Perspective Display Mode code numbers control how triangle elements are displayed. Line elements are normally displayed using Perspective Display Mode code number 1 when all elements to be displayed are just line elements, and Perspective Display Mode code number 10 when mixed triangle and line elements need to be displayed at the same time. The Mutate command can be used to convert line elements into triangle elements so that some of the other Perspective Display Modes can be used to display the mutated line elements along with triangle elements.

The Series 10 Perspective Display Modes are primarily for use while editing triangle data to get a quicker view with semi-hidden line removal, to view the normals direction from each triangle, or other wire-frame variations of the triangle elements for viewing their construction.

The Series 10 Perspective Display Modes bypass the Z-Buffer in some video modes, and so can display triangle or line elements faster when those video modes are used, e.g. the 4bpp and 8bpp video modes in the Preview command of v3.7L. Since the Z-Buffer is not used to remove hidden lines, full hidden line removal is not done, but Series 10 modes that remove some of the hidden lines may make viewing the wire-frame like image clearer.

Perspective Display Mode 10 is another "Universal" Perspective Display Mode, designed to display line or triangle elements on all video boards in all graphics video modes, e.g. monochrome or color.

Since the triangles are not filled in you will be able to see some of the lines or parts of lines that should not be displayed because they are the hidden lines, but many of the "would be hidden" lines that show up in a wire- frame display are removed, so the result is intermediate between wire-frame and full hidden line display.

Perspective Display Mode 11 shows all of the edges of the triangles selected as outside edge or junction edge when the triangles were drawn.

Perspective Display Mode 11 differs from Perspective Display Mode 10 in that is shows all of the triangle edges, not just the edges of the triangles facing the viewer.

Perspective Display Mode 11 differs from Perspective Display Mode 12 in that is shows all of the triangle edges, but not all of the triangles' sides. Triangle edges are the sides of the triangles that were designated to show in the display by the triangle's line attributes, see Appendix: N for more information about triangle line attributes.

Perspective Display Mode 12 shows all of the triangle sides, including both the designated to display edges and the sides that normally are not displayed.

Perspective Display Mode 12 differs from Perspective Display Mode 13 in that is shows all the triangle sides, e.g. p1 to p2, p2 to p3, and p3 to p1, but not the normal lines going from p3 to p4 (pN standing for points of each triangle in a triangle element).

Perspective Display Mode 13 differs from Perspective Display Mode 12 in that is shows all the triangle sides including the triangle's normal line, e.g. p1 to p2, p2 to p3, and p3 to p1, and the normal lines going from p3 to p4 (pN standing for points of each triangle in a triangle element).

Each triangle in a triangle element uses two drawing lines in the drawing workspace, recording points p1 and p2 in the first line segment, and points p3 and p4 in the second line segment of the line segment pair. Therefore triangle elements contain an even number of line segments. The points p1, p2, and p3 are the corners of the triangle, the point p4 is the end of a normal line drawn away from the outside face of the triangle from p3.

Normally the normal lines are not displayed, but when you need to check to see if the normals are pointing in the correct direction you can use Perspective Display Mode 13 to see them and to some degree what direction they are pointing in. See also Perspective Display Mode 3 since it also displays the normal lines of the triangles, but it fills in the triangles as well, and so may be more useful for some needs.

See the Correct and Revert commands in the Hidden line sub-menu of the Drawing Editor for ways to edit the normals of triangles in a drawing element.