CIS 3100 Introduction to Programming Using Virtual Reality

A new alice world based on the grass template is now

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A new Alice world based on the grass template is now open, and you can see the standard Alice Interface that you used earlier in the chapter. Notice that the object tree in the upper left part of the interface contains the four tiles that appear in every Alice world: world, camera, light, and ground, as shown in Figure 1-6. You can see from the way the tree is organized that the other objects are sub-objects of the world object. The new world also has the default event – When the world starts, do world.my first method – in the Events area, and a blank default method - world.my first method – in the Editor Area. Note that “ the world starts ” is considered an event whereas “ world.my first method ” is the event handler. Recall that an event handler is a method of the world object that carries out the task to be performed when the event the world starts occurs. Adding Objects to an Alice World With the next steps, we introduce you to the Alice Object Galleries and the process of adding objects to an Alice world. Many people get carried away with creating big Alice worlds with many objects when they first start to use Alice. In this tutorial, you will start with a very small Alice world with a minimum number of objects. Objects are added to an Alice world in the Scene Editor mode. Figure 1-6 . The object tree after starting a new world.
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Alice – Chapter 1 DRAFT June 10, 2013 pg. 22 of 38 ~~~ Steps to Perform ~~~ To enter the Scene editor mode: 1. Click the large green ADD OBJECTS button in the bottom-right corner of the World window to enter Alice’s Scene Editor mode , which is used to add objects to an Alice world and position them. 2. Note that the Alice Interface now looks different, as shown in Figure 1-7. The Object tree and the Details area are still visible on the left, but there is a new area, called the Scene Editor on the right side of the screen. Figure 1-7. The Alice Interface in the Scene Editor Mode,
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Alice – Chapter 1 DRAFT June 10, 2013 pg. 23 of 38 The Scene Editor has new controls, a larger world window, and object galleries on the bottom. The Scene Editor replaces the Events area and the Editor area when you are in the Scene Editor mode. Let’s look at the Alice object galleries. There are two object galleries: a Local Gallery provided with the Alice software, and a Web Gallery maintained by the Stage Three Development Team at Carnegie Mellon University. (You need an active Internet connection to use the Web gallery.) The local objects gallery is visible at the bottom of the screen in the Scene editor mode as seen in figure 1-7. The galleries are organized as a tree of folders containing related objects. You can navigate the tree of galleries by clicking on a gallery folder to enter that gallery, or by using the gallery navigation bar, just above the galleries.
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