The topics in this section include:
Navigating the Visualizer Window
The Visualizer (3D View) window comes with a built-in set of key bindings that you can use to navigate within the window and to perform rotations, pan, and zoom operations. The key bindings differ, depending on whether you are running OpenSim on a Windows, or Mac platform. You can translate and rotate in the 3D View window using the following:
rotate | To rotate the view, left-click and hold (PC or mouse) or single-finger click and hold (Mac trackpad) in the Visualizer window and drag the cursor. |
translate | To translate the view, right-click and hold (PC or mouse) or two-finger click and hold (Mac trackpad) in the Visualizer window and drag the cursor. |
zoom | To zoom in or out, scroll up or down in the Visualizer window with the mouse or trackpad. Alternatively on a trackpad, pinch or expand. |
The Visualizer Window Toolbar
The Visualizer window comes equipped with a set of standard buttons to make it convenient to orient the objects in the 3D View according to your preferences. These buttons appear in a Toolbar, which is located by default at the top left corner of the visualizer window. The following buttons are available in the Toolbar:
| Look at the model from the world's –X direction. Note that multiple models could be loaded and each model could have its own concept of "front," but there's one unambiguous –X direction within the world's coordinate system. Similarly, |
| Toggle the display of world coordinate axes on and off. |
| Take a snapshot of the view. When you click this button, a file browser is brought up and you are prompted for the name of a .png file in which to save an image of the 3D View. |
| Record a movie. Clicking this icon toggles movie recording on and off. |
 | Zoom-in. |
 | Zoom-out. |
 | Fit the model in the Visualizer Window using the current camera orientation. |
Hot Keys
The following set of hot keys are available and can be used to achieve some of the same functionality that is available through the ToolBar:
Button | Function |
|---|---|
i | Zoom in |
o | Zoom out |
| Arrow keys | Reposition camera field of view |
Selecting Objects in the Visualizer Window
Selecting objects in the visualizer View is a fundamental part of the graphical editing capabilities available in OpenSim. It makes it easier to perform tasks, such as moving muscle attachment points. The following operations are supported:
select | Select an object using single click. An object that has been selected will be indicated by a yellow wireframe bounding box around it, and its name will appear in the status bar. If there is a node corresponding to the selected object in the Navigator tree, it will be selected. Selection is possible only on the current model. Objects can also be selected by double clicking on them in the navigator. |
clear | Clear all selections by using left mouse in an empty area of the view. |
drag | Drag objects by selecting them, if dragging is allowed you'll see a triad attached to the selection box. Use the left mouse to click and drag the object to its new location using the arrows of the triad. Currently only dragging of muscle points and markers is supported. |
View Controls Menu
At the upper right corner is an expandable menu of options to further customize the Visualizer window. You can expand the menu (collapsed by default) by clicking the "Open View Controls" button.
The following table describes the names and functions of these options:
| Option | Function |
|---|---|
| Backdrop: Background Color | Select solid background color from popup. |
| Backdrop: Image | Select from a preset list of images to serve as a backdrop or select nobackground for solid/no-image backdrop. |
| Floor: Texture | Select from a preset list of textures for floor material or nofloor at all |
| Floor: Height | Use this slider to move the floor up/down as needed. Models project shadow on the floor by default. |
| Lighting: Select Scene Light | Picking this option will show a triad attached to the light source used to generate shadows, use the triad to position the light source as needed. |
| Lighting: Model Light | This slider controls the intensity of the light source placed by default on top of all your models. |
| Snapshot Quality | This slider controls the quality of images generated using the "snapshot" button. Values range from (1-4) where 4 is max resolution/quality. |