MATLAB SIMULINK 3D ANIMATION 5 Bedienungsanleitung PDF herunterladen (Seite 28)

scenes (like inspecting miniature objects or visualizing a large-scale aircraft

operation space), provided the scene author defined the NavigatioInfo

parameters correctly.

5.1.4. Coordinate System Used

VRML uses right-handed Cartesian coordinate system, with axes defined so

that:

+x points right

+y points up

+z points out of the screen

In order to avoid necessity to transform object axes into VRML system later on,

it is good to export CAD models using identical coordinate system whenever

possible. If your CAD tool uses a different coordinate system, and it doesn’t

allow you to change it for the exported objects, note the difference between

the systems so that you can implement axes transformations in your model.

Make a note of the orientation of the parts in the coordinate system. For

instance, a vehicle model exported so that it points towards the +x axis will

have to be placed on a road in the virtual scene that starts in that direction.

Model of vehicle dynamics will also need to count with this initial orientation of

the vehicle 3D model.

When the CAD tool allows you to animate parts and assemblies, reset their

positions to the initial state before the export.

5.1.5. Assembly Hierarchy

When exporting an assembly of several parts, there are usually two approaches

possible:

 All parts are independent from each other

Objects in the scene are independent from each other, at the same level

of scene hierarchy. VRML file has a flat structure. All part coordinates are

defined in global coordinates.

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MATLAB SIMULINK 3D ANIMATION 5 Bedienungsanleitung Seite 28