Page 575 - ExtendSim User Guide
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Tips and Reference 549
To change the overall location of the 3D objects, move the home position of the hierarchical block using the Set button and positional arrows on the Block Animation tab. The arrows cause the home position to be moved in 0.5 meter increments; the Set button allows for exact param- eters.
Items stack on top of each other
If multiple items arrive within the same simulation time unit, they will stack on top of each other. You may not want this behavior unless this is how your system behaves.
The exponential arrival distribution can result in arrival times that are extremely short, causing items to arrive at exactly the same time. To prevent this, enter some small number, such as 1.0, as the Location parameter.
This changes the minimum arrival time to one item per time unit, a more realistic minimum for item arrivals in 3D. You could experiment and make the Location parameter a little less, but if it is too small, item objects could collide and stack when they arrive.
Performance Considerations
The E3D window is doing a complete textured rendering of a complex 3D environment. The performance of the animation is directly related to the number of objects being rendered and the capability and sophistication of your computer.
Suggestions for improving performance
There are several things that you can do to improve performance if the E3D window is feeling sluggish or if the 3D rendering is not able to keep up with the speed of the commands from the ModL code.
1) Thefirstthingtoconsideristhecapabilityofyourcomputer’sgraphicscard.Itiscriticalto have a modern, powerful graphics card in your machine for any 3D graphics application. The 3D rendering done by the E3D window is comparable to the rendering done by 3D gaming software, so buying a card that is recommended for running a modern game is advised.
2) ThenumberofobjectsbeingrenderedintheE3Dwindowatonetimeisoneofthekeyfac- tors that determine how much work the E3D window is doing. ExtendSim will not impose a limit on the number of objects you can try to put on the screen at one time, but displaying a large number of objects in motion can cause the 3D animation to slow down.
3) Shadows can be enabled or disabled from the Options dialog’s 3D tab. They are cosmetic and add to the visual impact of the rendering of the 3D world, but are disabled by default since they will increase the load on the 3D graphics card and processor.
4) The3DtaboftheOptionsdialogalsohasasettingthatallowsyoutochoosethelevelof detail (LOD) of the 3D objects rendered in the 3D window. If you are not having perfor- mance issues, you should probably leave this popup menu on the Very High setting. If you are having performance issues you can try turning it down to High or Medium. The Low setting is not recommended unless you are running with very many objects, or on a machine that is not very capable. On the Lo' setting many objects will not look well defined.

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