First geometric object is Box. Box has only one item, size. Default value for size is 2 2 2. It means cube with edge equal 2. If is not defined Transform, Box is placed in (0,0,0)with edges from -1 to 1 for each dimension.

    Next geometric object is Cone . Parameters for cone are: bottom,bottomRadius, height, and side. Bottom and side has values type Boolean (TRUE or FALSE). If value is TRUE that part of Cone exists. If is FALSE, than not exists and is not displayed. BottomRadius is size of radius on the bottom of Cone. This value must contains value 0 or more. Value height identify size of Cone from bottom to top. If Transform is not defined, than object is vertical from -1 to +1.

 

#VRML V2.0 utf8  Example for Cone   Shape     {         appearance Appearance         {            material Material            {               diffuseColor 1 0 1            }# end of Material         }#end of Appearance        geometry Cone         {            bottom         TRUE            bottomRadius   1            height         2            side           TRUE          }#end of Cone     }#end of Shape

 

#VRML V2.0 utf8  Cylinder.wrl   Shape    {        appearance Appearance         {            material Material            {                diffuseColor 0 1 1            }# end of Material         }#end of Appearance       geometry Cylinder        {           bottom   TRUE           height   2           radius   1           side     TRUE           top      TRUE        }#end of Cylinder   }#end of Shape

 

geometry Sphere    {        radius    1     }#end of Sphere

     Object Transform is  type grouping node, which allows to define coordinate system,which is different as default VRML coordinate system, for all children objects. This will allow you to place groups of children in different locations within the world. In the next table, you will see how the code for a Transform node works.

 

Transform    {        center            0 0 0        translation      0 0 0        rotation          0 0 1  0        scale             1 1 1        scaleOrientation  0 0 1  0        translation       0 0 0        bboxCenter        0 0 0        bboxSize        -1 -1 -1        children          []     }

    Second attribute is translation. Translation defines point in space, in coordinate system, where should be positioned object. For example defines,that we wants to have object  moved in all axis about 1 so lets define translation  (1,1,1).

    Next is rotation, which defines value of rotation in coordinate system about vektor. Default value defines, that coordinate system willrotate about z-axis, (0,0,1), 0 radians.

    The scale and scaleOrientation fields specify an amount and a rotation of the scale of the transform. The scale value specifies a nonuniform scale. A scale value specifies the size of the units in a coordinate system. This means that if the values in scale are 2 2 2, then the object(s) in the transform would be effectively doubled in size in each direction (X, Y, and Z). If the values are .5 .5 .5, then the object(s) are decreased by half. You can scale by differing amounts in each direction if you desire. You must use a value greater than 0.0 in the scale field. The scaleOrientation field allows you to specify a rotation value about a vector for the scale field. This field only applies to the scaling of the coordinate system. The next example simply adds the scale and scaleOrientation field to the blue line in the previous example. The example uses a scale value of 3 3 3 and the default scaleOrientation value. This makes the cylinder of height = 6 equal to a cylinder (with a default scale of 1) with height = 18. The radius = .1 becomes similar to radius = .3 and so on. So you see, the scale field is a unit multiplier that allows you to change the unit size in the coordinate system.

    The children field allows you to define more than one object per Transform node. You can have several Shape nodes
within a Transform node by using a children field. The only requirement is that each "child" use the same values as specified in the Transform node. In the next example, the first two transform nodes (in the previous examples) have been combined to form one Transform node. Both "child" nodes will use same value as specified in the center field. There will be no change in the actual appearance of the output, but this allows us to streamline the code saving both file space and rendering time.

    The bboxSize and bboxCenter fields are used to optimize rendering of Transform nodes. Bbox is short for bounding box. A bounding box is used to enclose a Transform node's objects so the browser only renders the area that is specified. If the bounding box size is too small to accomodate the world's object, then the results are undefined. The default values of -1 -1 -1 indicate that no values have been specified and the browser must compute the values. A field value of 0 0 0, indicates only a point in space. Values for this field must be greater than or equal to 0.0. The center of a bounding box is specified by bboxCenter and specifies an offset from the local coordinate system.

    6. Appearance Node

     Object Appearance defines visual characteristics of geometric data inside of group. Object has 3 attributes : material, texture, and textureTransform.

 

Appearance    {       material NULL       texture NULL       textureTransform NULL    }