WebGL Programming Guide: Interactive 3D Graphics Programming with WebGL (Jason Arnold's Library) by Kouichi Matsuda & Rodger Lea

Author:Kouichi Matsuda & Rodger Lea
Language: eng
Format: epub
Publisher: Addison-Wesley Professional
Published: 2013-07-26T16:00:00+00:00

Line 132 calculates the matrix for the viewing volume (projMatrix) and passes it to u_ProjMatrix at line 135. Line 140 displays the current near and far value on the web page. Finally, at line 142, the triangles are drawn.

Changing Near or Far

When you run this program and increase the near value (right-arrow key), the display will change, as shown in Figure 7.14.

Figure 7.14 Increase the near value using the right arrow key

By default, near is 0.0, so all three triangles are displayed. Next, when you increase near using the right arrow key, the blue triangle (the front triangle) disappears because the viewing volume moves past it, as shown in Figure 7.15. This result is shown as the middle figure in Figure 7.14.

Figure 7.15 The blue triangle went outside the viewing volume

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