EDGEN Tutorial

EDGEN TUTORIAL 5 This tutorial illustrates a typical use of EDGEN: a time-distance study involving the visibility between several objects. The specific example involves a child exiting a school bus, walking around to the rear of the bus, then crossing the road in front of an oncoming vehicle. We’ll view the sequence from several vantage points to address the issue of avoidability. We will create three EDGEN events in this tutorial. The first event simply places the school bus. The second event moves the child out of and around the back of the bus. The third event moves the approaching vehicle. Like all EDGEN events, the procedure involves the following basic steps: Create the human(s) Create the vehicle(s) Create the environment Execute the EDGEN event Review the output reports This basic procedure is described in detail in this tutorial. This study involves both a human and vehicles, and it involves 3-dimensional motion. The text and figures within gray-shaded areas of this tutorial are important for HVE users, but may be ignored by HVE-2D users. If you are using HVE-2D, the Human Editor is not available and motion is restricted to the X-Y plane. Nevertheless less, HVE-2D users will benefit from following the process for the two vehicles moving in the X-Y plane. T UTORIAL Getting Started As in other tutorials, before we get started with our current tutorial, let’s set the user options so we’re all starting on the same page. To set the initial user options, choose the following from the Options Menu: ON: Show Key Results OFF: Show Axes ON: Show Contacts OFF: Show Velocity Vectors ON: Show Skidmarks OFF: Show Targets ON: AutoPosition Units equals US Render Options: Show Humans as Actual Show Vehicles as Actual Phong Render Method Complexity equals Object Render Quality equals 5 Texture equals 1 Anti-aliasing equals 1 The remaining options will automatically initialize to their default conditions. We’re now ready to proceed with the tutorial.  Creating the Humans To create the human for our event, perform the following steps: If the Human Editor is not the current editor, choose Human Mode. Now, let’s add the male child pedestrian from the Human Database. Click Add New Object. The Human Information dialog is displayed. Click on the option buttons in the Human Information dialog to choose the following human attributes: Location = Pedestrian Sex = Male Age = 12 year old Weight Percentile = 50 Height = 50 Edit the default name: Click OK to add Male Child Pedestrian to the Active Humans list. After the above steps are performed, the human pedestrian has been added to the case and is ready to be analyzed. T UTORIAL Creating the Vehicles Our event requires two vehicles; the first is a yellow school bus and the second is a blue Ford Taurus. Let’s add the school bus to our case: Choose Vehicle Mode. The Vehicle Editor is displayed. Click Add New Object. The Vehicle Information dialog is displayed. The Vehicle Information dialog allows the user to select the basic vehicle attributes according to Type, Make, Model, Year and Body Style. Using the option buttons, click each button to choose the following vehicle from the HVE Vehicle Database: Type = Truck Make = International Model = Loadstar Year = 1990 Body Style = Bus Edit the default name; enter Click OK to add International School Bus to the Active Vehicles list. The school bus is now displayed in the viewer. Next, let’s add the Ford Taurus to the case: Click Add New Object. The Vehicle Information dialog is displayed. Using the option buttons, click each button to choose the following vehicle from the database: Type = Passenger Car Make = Ford Model = Taurus Year = 1996-1999 Body Style = 4-Door Click OK to add Ford Taurus 4-Dr to the Active Vehicles list. The International school bus and Ford Taurus are shown in Figure 5-2. We now have both vehicles required for our study.  T UTORIAL Editing the Vehicles Next, we’ll edit the vehicles to change their color. Since it’s currently loaded in the Vehicle Editor, we’ll start by changing the color of the Ford Taurus. Click on the vehicle CG and choose Color. The Vehicle Color dialog is displayed (see Figure 5-3), showing the vehicle’s current color (the small black square, or hot spot, in the color wheel) and intensity (the arrow in the intensity slider). Click on the hot spot and drag it to the center of the blue area. To darken the vehicle slightly, click on the intensity slider and drag it slightly to the left. When the color is to your liking, close the dialog by clicking on the close button in the upper right-hand corner of the dialog.  Next, we’ll edit the color of the school bus: Click on International School Bus in the Active Vehicles list, making it the current vehicle. The International School Bus is now displayed in the Vehicle Editor. Click on the vehicle CG and choose Color. The Vehicle Color dialog is displayed. Click on the hot spot and drag it to the center of the yellow area. To lighten the vehicle, click on the intensity slider and drag it to the far right end. When the color is to your liking, close the dialog by clicking on the close button in the upper right-hand corner of the dialog. The International School Bus and Ford Taurus are now ready for use in our tutorial. Using the viewer thumb wheels, rotate (translate in HVE-2D) and look at the vehicles. T UTORIAL Creating the Environment Now, let’s add the environment: Choose Mode. The Environment Editor is displayed. Click Add New Object. The Environment Information dialog is displayed. Using the Location Database combo box, choose Chicago, Illinois, USA. The latitude (41.53.00N), longitude (87.40.00W) and GMT, hours from the prime meridian (-6.00) are displayed for the selected location. Edit the environment name: . Enter the date and time of the incident we are studying, and , respectively. Enter the angle from true north to the earth-fixed X axis in our environment, degrees. To add the environment geometry file to our case, click on Open. The Environment Geometry File Selection dialog is displayed. Click on the File Format option list and choose HVE. A list of environment geometry files using the HVE file format is displayed in a list box. Double-click on 4T2_Intersection.h3d to choose the environment file and remove the dialog. Press OK. The selected environment is added to our case and displayed in the Environment Viewer (see Figure 5-4). Use the viewer thumb wheels to view the scene.  Saving the Case Now that we’ve created vehicles for our case, let’s save the case file. Click on the File menu and choose Save. The Save-as File dialog is displayed. Place the mouse cursor in the Case Title text field and enter . Place the mouse cursor in the Filename text field and enter . Click SAVE. The current case data are saved in the subdirectory. T UTORIAL