The following list summarizes the general procedure for adding the individual helpers. Consulting this before you begin should prove helpful, because the procedure is the same or very similar for all of them.
1. Create your scene in the usual way with lighting, materials, and animation. Pay special attention to creating and naming cameras; they are listed in the Virtual Reality Exporter browser and are an important means of navigation.
2. Go to the Create panel and choose Helpers. Then select the virtual reality option from the drop down list. Select all the features described in this section unless otherwise noted.
3. Click the button for the helper you want (time sensor, for example), and then click and drag in the Top view port to place the Helper icon. Most of the Helper icons can go anywhere in the scene. Some, such as the Level of Detail helper, must be placed next to the objects they affect.
4. Link the helper to the objects in the scene that it affects. You usually do this by picking the objects, as described in the procedure for each helper.
5. Export the file in WRL format. Select Virtual Reality Exporter for all the features described in this section.
6. Test the file in your browser. To test the file, open it from your hard disk first to make sure that the helper works as expected. Then upload the file to the Web server and test the world live on the Web. You do not need to add the helpers to the sample scene in any particular order. There is no right order to placing them, although starting with the background seems logical.
The background helper defines the colors for a sky or ground backdrop to the world. This can be a plain color or a gradation made of two or three colors. If you define both sky and ground, you get a horizon line. The background helper also provides options to set a bitmap image for the sky and ground (however, no browsers support this feature yet).
You should place a Background helper in your scene whenever you want to control the colors of the browser view port. In daylight scenes, for example, you want a sky-colored background. (Cosmo and Sony Community Place both display a black background by default.) The time sensor helper controls animation settings such as Start and End Frames and Looping.
By adding a number of temporal sensors to the objects in your scene, you can play segments of the scene’s animation out of sequence-something you cannot do in your 3D application. Suppose, for example, that you have two boats rowing down the river with exactly the same animated stroke of the oars. By using a separate sensor for each boat and selecting a different range of frames, you can have the stroke of the oars different for each boat.
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