By Norman Lin
This moment colume presents programmers who're skilled in either Linux and basic 3D images thoughts with a well-rounded perpesctive on 3D idea and perform in the context of programming higher interactive 3D purposes
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The event source is a window created under a specific event-driven windowing system. The role of the dispatcher is to receive events from the system-specific window, and to call the appropriate pipeline functions to allow the pipeline to respond to the events. , your application logic) from the details of the underlying event-generating mechanism. This way, the pipeline’s logic can focus exclusively on application-specific responses to events, without needing to know exactly how the windowing system generates and transmits events.
The plug-in constructor first parses the parameter string to get the position, orientation, and required filename for the Videoscape object to be loaded. Next, it opens the mesh file and reads in the vertices and faces. The Videoscape format stores coordinates in a right-handed system, with the z axis going up; l3d uses a left-handed system with the y axis going up. To convert between these two systems, we need to do two things: swap the y and the z values as we read them from the Videoscape file, and reverse the ordering of the vertices in a face definition to preserve the front/back orientation of the face after the vertex swap.
This, in turn, invokes the pipeline’s constructor, which creates the screen, rasterizer implementation, and rasterizer objects. At this point, the application is ready to respond to events. We just need to pump events to the pipeline in order to allow it to respond to input, update itself internally, and draw to the screen. To start the entire event process, we start the dispatcher. Step 5. Start the Dispatcher The fifth step in writing an l3d application is to start the dispatcher. We must do three things: 1.