Each vertex in a fly through path acts as a key-frame in a fly through video. When rendering the fly-through, frames will be created between each key frame to provide a smooth transition between key frames at a specified frame rate.
Each vertex in a fly-through path contains a time-stamp and elevation, and additional attributes including velocity, heading, pitch and bank angle, that are used to generate the fly-through video. These values can be auto-generated using the Fly-Through Path dialog options, or may be recognized from some vector file format data.
The Fly-Through Path Properties can be accessed from the button on the Analysis toolbar or the 3D view toolbar. It can also be accessed from the digitizer right-click context menu under Vertex Editing >
Add Fly through parameters to an already generated line feature , or from the Fly-Through.... button at the bottom of the Feature information or Modify Feature Info windows.
The first step is to create or choose a line feature to represent the path the camera will take. An existing line features may be used to define the flight path. These lines can be real-world flight path data, such as from GPS, or a line drawn using the digitizer tool. If drawing a line with the digitizer, add a vertex at each desired key frame location. These are points that the fly-through will hit, and act as the anchor points for settings like camera angle and velocity.
To define a fly-through path, select a line feature with the digitizer tool and press the fly-through path button.
In the auto-generate fly-through data section, specify the Camera Mode (Straight Ahead, Fixed Direction, or Fixed Point).
Specify the Elevation, and the Elevation Mode for the camera.
Specify either a video Duration or an Average Velocity.
Press the Generate Fly-through Data button and see the Z, Time, Velocity, Heading, Pitch and Bank values update in the table for each vertex.
Optionally adjust the settings and press the Generate Fly-though Data button again to update. Or double click on a row and modify the values for a particular vertex.
The fly-through path is now ready for Preview, Play or Save to a video. Open the 3D view to access these tools.
The editor will show a list of line vertices. These will be the location of key framesIn fly- through videos the line vertices of the fly-through path are linked to video frames that are generated based on the location and camera values for the vertex. The video of the 3D geospatial data is calculated using the key frame values, and then smooth interpolation to calculate other video frames that transition between the keyframes.. The fly-through view requires elevation, if not already defined in line feature, frame time, and camera heading and pitch. This data can be auto-generated. Once generated, individual key frames can be edited. For any point features or line vertices with recognized timestamp attributes, a 'Time' column will be generated.
To generate view data, first select the Camera Mode:
Checking this option will auto calculate the bank angle based on the flight path. The bank angle is calculated from the turn radius and velocity, up to +/-30 degrees.
There will be a warning generated if the bank angles have been clamped to the maximum (+/-30°).
Check this option to smooth the results for Camera Heading and Bank Angles. Rather than strictly adhering to the calculated values, smoothing can reduce the jerkiness of resulting image. This setting is recommended for lines that have been created using the digitizer trace tool, or are otherwise jagged.
Next select the Elevation
When rendered, the camera will move at a constant velocity such that the time to travel from first to last key-frame will take this number of seconds. Preview and Save options can be found among the Fly-through tools below.
Average Velocity is automatically calculated when a video / flight duration value is entered. Auto generated fly through data is calculated at a constant velocity, using the speed and distance along the flight path to calculate the time for each key-frame. See velocity for information about varying the velocity throughout the video.
Based on the specified settings above the attributes for Time, Heading and Pitch will fill in for each frame along the line.
Clear the attributes for Z, Time, Velocity, Heading, Pitch and Bank Angle.
Select this option for save the path to a supported format. Fly-through data can only be preserved in vector formats that support per vertex attributes. They will also be saved in a workspace file.
Select the layers to include in the export in the Exported Layers dialog. Choose from the following options:
Be careful choosing this option with Lidar data or other large data-sets loaded.
Select the Export Format from the following options: