Graphics Reference
In-Depth Information
drop is caused by glman looping through multiple instances of your display to
get more precise timing. Your speed will go back to normal once you turn off
this option. The timing does not include the initial seting and clearing of the
framebuffers, nor does it include swapping of double buffers. It measures the
display speed of just your scene.
Miscellaneous
At the top of the user interface window there are two check-
boxes and one slider, shown in Figure 4.9.
Axes. When this checkbox is selected, the three coordi-
nate axes in eye space are shown. Each of the axes is
labeled and is two units long in the appropriate direc-
tion.
Perspective. When this checkbox is selected, you are tog-
gled between perspective and orthogonal viewing, irre-
spective of your specification in the GLIB file.
Background Intensity. This slider lets you set the back-
ground intensity for your image.
At the botom of the user interface window you will see
an area with a checkbox and two butons, also shown in
Figure 4.9. The options given in this area are described below.
Verbose. Normally, the messages in the console window
are things that you might really need to know. If you
would like to see more of what is really going on behind
the scenes, click this checkbox on—but at times this can
be voluminous, so be sure you really want to see all this.
Don't say we didn't warn you!
Reset. This buton returns the scene to its original form
before any global or eye transformations have been
made, and before any selections. However, any changes
that were made in the uniform variables declared in the
GLIB file are retained.
There is one more checkbox in another window that you
should know about:
Show Variable Labels. This checkbox shows up at the bot-
tom left of the Uniform Variable user interface window
shown in Figure 4.4. When you click it, the values of the
uniform variables will be superimposed on top of your
graphics scene. This is very handy for doing screen cap-
Figure 4.9. The Axes, Perspective,
and background color sections
(top), the Display Frame Rate box
(middle), and the Verbose check-
box and Reset and Quit butons
(botom).
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