NASA World Wind for Java API Overview

Fabrizio Giudici – [email protected] – JUG MilanoJavaday Roma - 01/12/2007

Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License

NASA World Wind for JavaAPI Overview

Fabrizio Giudici



In a few words...

● 3D API for rendering the Earth– ... but also other planets

● Default data from NASA– You can feed other data providers– Beware of terms of use

● You can add your own objects



Some basic facts

● Based on JOGL (OpenGL bindings for Java)– Fast!– Fast Video Card required– But beware of drivers (especially in Linux)– Native library required

● You don't need to learn JOGL



Basic classes

● Configuration– How to set up things

● WorldWindowGLCanvas– The components that renders the scene

● Model– What we are going to render



Basic classes

● Layer(s)

– Stacked sets of rendered objects

● View, OrbitView– The coordinates and other attributes of the view

point

● SceneController– The controller



Standard Layers

● Stars● Fog● SkyGradient● BMNGSurface● LandsatI3● USGSDigitalOrtho

● USGSUrbanAreaOrtho● CountryBoundaries● EarthNASAPlaceName● ScaleBar● WorldMap● Compass



The demos

● ViewIteration

● GlobalGridAboveSurface

● Shapes

● DraggingShapes

● SurfaceImages

● TexturedSurfaceShape

● Tracks

● AnaglyphStereo

run-demo.bash demo_name



ViewIteration

● Goes to a specific location applying a smooth transition

● OrbitView● ScheduledOrbitViewStateIterator



GlobalGridAboveSurface

● Draws a grid over the surface● RenderableLayer● PolyLine

– color– numSegments– followTerrain



Shapes

● Sticks and renders many different shapes at given coordinates

● RenderableLayer– SurfaceSector, SurfaceEllipse, SurfaceSquare, SurfaceCircle, SurfaceQuad, Quadrilateral, SurfacePolygon, PolyLine

● IconLayer● WWIcon, UserFacingIcon



DraggingShapes

● Surface shapes can be selected and dragged● SelectListener

– SelectEvent.HOVER– SelectEvent.ROLLOVER– SelectEvent.DRAG– SelectEvent.DRAG_END



SurfaceImages

● Paints a given image over the surface● RenderableLayer

– SurfaceImage



TexturedSurfaceShape

● Paints a shape with a given texture over the surface

● RenderableLayer– SurfaceSector– TexturePaint



Tracks

● Renders a track with waypoints● TrackMarkerLayer

– Track



Anaglyph Stereo

● Renders a 3D view that can be viewer with 3D glasses

● Configuration● AnaglyphSceneController

– setDisplayMode(...)– setFocusAngle(...)



Contacts & Links

● http://worldwind.arc.nasa.gov/java● http://bluemarine.tidalwave.it● http://forceten.tidalwave.it (soon)

● http://weblogs.java.net/blog/fabriziogiudici● http://www.tidalwave.it/people

NASA World Wind for Java API Overview

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