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| The goal of visualization is to generate representations of the data in
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| a visual form. In this chapter we will see different mechanisms available in
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| ParaView to look at the data to gain insight into it. | |
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| ==Views==
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| When the ParaView application starts up, one sees a 3D viewport with
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| an axes at the center. This is a ''View''. In ParaView, ''Views'' are frames in
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| which the data can be ''seen''. There are different types of views. The default
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| view that shows up is a ''3D View'' which shows rendering of the geometry
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| extracted from the data or volumes or slices in a 3D scene. You can change the
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| default view '''Settings''' dialog (Edit | Settings (in case of Mac OS X,
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| ParaView | Preferences)).
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| [[Figure 1]]
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| There maybe parameters that are available to the user that control how the data
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| is displayed e.g. in case of 3D View, the data can be displayed as wireframes or
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| surfaces, you choose to change the color of the surface or use a scalar for
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| coloring etc. All these options are known as ''Display'' properties and are
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| accessible from the '''Display''' tab in the '''Object Inspector'''.
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| Since there can be multiple datasets shown in a view, as well as multiple views,
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| the '''Display''' tabs shows the properties for the active pipeline object
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| (changed by using the Pipeline browser, for example) in the active view.
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| ==Multiple Views==
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| ParaView supports showing multiple views side by side. To create multiple views,
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| simply use the controls on the top-right corner of the view to split the frame
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| vertically or horizontally. You can even maximize a particular view to
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| temporarily hide other views. Once a view-frame is split, you will see a list of
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| buttons showing the different types of views that you can create to place in
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| that view. Simply click the button to create the view of your choice.
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| [[Figure 2]]
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| Some filters, such as '''Plot Over Line''' may automatically split the view
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| frame and show the data in a particular type of view suitable for the data
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| generated by the filter.
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| ===Active View===
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| Once you have multiple views, the active view if indicated by a colored border
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| around the view frame. Several menus as well as toolbar buttons affect the
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| active view alone. Also they may become enabled/disabled based on whether that
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| corresponding action is supported by the active view.
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| The '''Display''' tab affects the active view. Similarly, the ''eye icon'' in
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| the '''Pipeline Browser''' next the pipeline objects, indicates the visibility
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| state for that object in the active view.
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| When a new filter or source or reader is created, it will be displayed by
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| default in the active view, if possible (otherwise, if may create a new view).
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| ==3D View==
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| 3D View is used to show the surface or volume rendering for the data in a 3D
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| world. This is the most commonly used view type.
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| When running in client-server mode, 3D View can render data either by bringing
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| the geometry to the client and then rendering it there or by rendering it on the
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| server (possibly in parallel) and then delivering the composited images to the
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| client. Refer to the '''Client-Server Visualization''' chapter for details.
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| ===Interaction===
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| Interacting with the 3D view will typically update the camera. This makes it
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| possible to explore the visualziation scene. The default buttons are as follows,
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| they can be changed using the '''Application Settings''' dialog.
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| {|Modifier | Left Button | Middle Button | Right Button
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| |-
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| | | Rotate | Pan | Zoom
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| | Shift | Roll | Rotate | Pan
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| | Control | Zoom | Rotate | Zoom
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| |}
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| This view supports selection. One can select cells or points either on the
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| surface or those within a frustum. Selecting cells or points makes it possible
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| to extract those for further inspection or label them etc.
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| ===View Settings===
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| The view settings dialog accessible through the Edit | View Settings menu or the
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| tool button on the left-corner of the view is used to change the view settings
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| per view.
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| ====General====
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| This tab allows the user to choose the background color. One can use a solid
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| color or a gradient or even a background image.
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| By default the camera uses perspective projection. To switch to parallel
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| projection, check the "Use Parallel Projection" checkbox in this panel.
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| ====Lights====
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| The 3D View requires lights to illumniate the geometry being rendered in the
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| scene. Once can control these lights using this pane.
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| ====Annotation====
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| The annotation pane enables controlling the visibility of the center axes and
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| the orientation widget.
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| ===Display Properties===
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| ------- View --------------------
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| | Control | Use
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| |- View | Checkbox to toggle the visibility of the data in the active view.
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| |- Selectable | Checkbox to toggle whether the data gets selected when using
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| the selection mechanisms
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| |- Zoom to Data | Zooms the camera to show the data in the active view
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| -------- Color -----------------------
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| | Interpolate Scalars | If on, the scalars will be interpolated within polygons
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| and the scalar mapping happens on per pixel basis. If off, then color mapping
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| happens at points and colors are interpolated which is typically less accurate.
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| This only affects when coloring with point arrays. Has no effect otherwise.
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| | Map Scalars | If the data array being color with can be directly interpreted
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| as colors then one can uncheck this to not use any lookup table. Otherwise, when
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| on, a lookup table will be used to map scalars to colors.
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| | Apply Texture | Makes is possible to apply a texture over the surface. This
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| requires that the data has texture coordinates. Once can use filters like
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| '''Texture Map to Sphere''', '''Texture Map to Cylinder''' or
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| '''Texture Map to Plane''' to generate texture coordinates when not present in
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| the data. To load a texture, select '''Load''' from the combo-box which will
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| popup a dialog allowing you to choose an image. Otherwise pick from already
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| loaded textures listed in the combo-box.
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| | Color By | This enables coloring of the surface/volume. Either choose the
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| array to color with or set the solid color to use. When volume rendering, solid
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| coloring is not possible, one has to choose the data array to volume render
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| with.
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| -------------Slice ---------
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| These setting are only available when showing a slice of an uniform grid
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| dataset. Allows the user to pick the slice direction as well as the slice
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| offset.
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| ------------ Annotation----------
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| Cube axes is a annotation box that can be used so show a scale around the
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| dataset. Use the '''Show cube axes''' checkbox to toggle its visibility. You can
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| further control the apperance of the cube axes by clicking '''Edit''' once the
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| cube-axes is visible.
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| [[Image:Cube Axes.png]]
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| ==2D View==
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| 2D View is similar to 3D view except that it can only show slices from uniform
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| grid datasets. The interaction is also limited to a 2D place i.e. rotation is
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| not available.
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| ===Interaction===
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| ===View Settings===
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| ===Display Properties===
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| ==Spreadsheet View==
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| Spreadsheet View is used to inspect the raw data in a spreadsheet. When running
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| in client-server mode, to avoid delivering the entire dataset to the client for
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| displaying the spreadsheet (since the data can be very large), this view streams
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| only visible chunks of the data to the client. As the user scrolls around the
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| spreadsheet, new data chunks are fetched.
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| Unlike some other views, this view can only show one dataset at a time. For
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| composite datasets, it shows only one block at a time. One can pick the block
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| to show using the '''Display''' tab.
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| ===Interaction===
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| * Choosing attributes to show
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| * Sorting
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| * Selection
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| * Show selected only
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| ===View Settings===
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| Currently, no user settable settings are available for this view.
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| ===Display Properties===
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| ==Line Chart View==
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| ===Interaction===
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| ===View Settings===
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| ===Display Properties===
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| ==Bar Chart View==
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| ===Interaction===
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| ===View Settings==
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| ===Display Properties===
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