The default number of bumps is 100 (10 X 10). You need to change these yE \dv)(<
parameters to match your design. Note that LightTools allows many other *)2& gQ&%+
placement options, but you will use the Bezier placement option for this Of*z9 YI
example. oA _,jsD4
5.On both the X Placement tab and Y Placement tab, change the Number of wjr1 ?c
Bumps parameter to 300, as shown in the following figure. Click Apply after ,MtN_ V-
each change. KV!!D{VS`@
6.Click OK to close the dialog box. > 4zH\T!
Note that the number of bumps is 300 X 300, which results in about 90,000 Ny.s
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bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a w<3g1n7R
manner defined by the Bezier parameterization option. Please see Chapter 5 of ^E5[~C*o3
the LightTools Core Module User’s Guide for more information. With the Z5vpo$l
current parameter values, the Bezier option varies the bump spacing along the nI -^
length of the light guide. The spacing in the orthogonal direction is constant. Qo!/n`1 9
The X and Y refer to the local coordinate system of the surface. ~ [por
LightTools Introductory Tutorial * 91 4;*o}E
+{$NN
HAPTER 5 Introduction to Backlight Design "uz}`G~O
C aK%i =6j!
Examining Surface Properties %U.aRSf/
Using the methods described in previous chapters, you may want to check your X"KX_)GZD
model before you run a simulation. n
2k&yL+a
Click on various parts of the model in the 3D Design View. Or use the System \9*,[mvC
Navigator to select different surfaces and view their Properties. 2xchjU-
1.In the System Navigator, click to open BottomSurface of the LightGuide, then bUW`MH7yJ
click Zones, and then click Texture. {~"&$DY2
2.Select SphericalElement, and then right-click and select Properties from the 2VNMz [W'
shortcut menu. The Shape tab shows you a graphical representation of the PLi [T4u
spherical bump shape that is the bottom of the light guide. &J\V
!uVo
You might be curious as to why you cannot see the 3D texture property zones you a-t}L{~
defined. They are invisible by default, because drawing thousands of texture YlZe
elements can make displaying and exploring the model somewhat slow. If you BCE} Er&
choose to make them visible, 3D textures are displayed in wireframe, even if the Hd1e9Q,:|
display mode is set to translucent. Wireframe rendering displays a bit faster and Kw%n;GFl'
shows more of the technical details. ]#C;)Vy
92 * LightTools Introductory Tutorial FM c9oyU~
`d H[&=S
HAPTER 5 Introduction to Backlight Design 8?lp:kM
C g| W|>`>
1.Rotate and zoom the model to that you can see something like the illustration '$]u?m
below: 
