MATLAB SIMULINK 3D ANIMATION - S Guide de l'utilisateur télécharger pdf (Page 181)

100

101

Using CAD Models with the Simulink 3D Animation Product

5-39

• “Wrap Shape Objects with Transforms” on page 5-39

• “Add DEF Names” on page 5-39

Wrap Shape Objects with Transforms

CAD tools export parts into VRML as individual shapes using various VRML object types

(e.g., a VRML Shape node or the Inline mechanism). To control part positions and

orientations, you need to wrap each such Shape or Inline node with a node that allows

for the changing of these properties. This wrapping node is the Transform node, whose

purpose is to transform the coordinates of its children. For instance, after wrapping with

a Transform node, an Inline node may have the following syntax:

Transform {

children [

Inline {

url ["robot_arm1.wrl"]

}

]

}

To set the initial location of the entire assembly in the virtual world, it is a good practice

to wrap all parts of the assembly with an additional Transform node.

Add DEF Names

CAD export filters often export objects with no names or with synthetic nondescriptive

names. To be accessible from MATLAB interface, each VRML object needs to be given

a unique name in the VRML file. You name the object by adding a DEF Object_Name

statement to the Transform line. After adding the DEF Object_Name, the Robot_Arm1

definition in the main VRML file has the following syntax:

1 2 ... 176 177 178 179 180 181 182 183 184 185 186 ... 489 490

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