2.1 Starting the Application

The main application program is called vdog. When you start it you get two windows. The main window of the application (called ViewDog). has the menu point File/Load, which allows you to open new input files (see figure 2.1).

Figure 2.1: Graphical User Interface when started

Let us for example load the file nurbsurf_bilinear1.dat (the file selector box is shown in figure 2.2). This example file contains a simple bilinear surface with a texture.

Figure 2.2: File Selector Box

Just to give you an idea of the format of the input files, here is the content of the above file:

Example 1: (taken from: data/examples/nurbsurf_bilinear1.dat (7.25))

surf1 = NURBSURF
( 
  (0., 0., 1., 1.),
  (0., 0., 1., 1.),
  (
    ((0., 0., 0., 1.), (10., 0., 10., 1.)),
    ((0., 10., 10., 1.), (10., 10., 0., 1.))
  )
);
teximg1 = TEXIMAGE2D(
  (
    ((1.0,0.0,0.0,0.4), (0.0,1.0,0.0,0.4)),
    ((0.0,0.0,1.0,0.4), (1.0,1.0,0.0,0.4))
  )
);
SCENEROOT = SCENENODE ( 
  (), 
  ( ATTRIBS(teximg1,USETEXIMG(2),USETEXMAGTONEAREST(1),
            USETEXMINTONEAREST(1),USETEXWRAPX(1),USETEXWRAPY(1),
            TEX2TRANSFORMS(TRNSF3PT((0,0,0),(8.0,0,0),(0,8.0,0)))
           )
  ), 
  (surf1)
);