WorldWind Android

WorldWind Android is a 3D virtual globe API developed by NASA. It provides a geographic context with high-resolution terrain for visualizing geographic or geo-located information in both 3D and 2D.

Key capabilities include:

• Customizing the globe's terrain and imagery.
• Using a collection of shapes to display and interact with geographic data.
• Representing various geometric objects in a geographic context.

To access development build snapshots containing the latest features and bug fixes, you must first add the OSS snapshot repository to your repositories block, then declare the snapshot dependency:

repositories {
    maven {
        url 'https://oss.jfrog.org/artifactory/oss-snapshot-local'
    }
}

... 

compile 'gov.nasa.worldwind.android:worldwind:0.9.0-SNAPSHOT'

To use the latest stable version of WorldWind Android in your Android project, add the following dependency to your build.gradle file:

compile 'gov.nasa.worldwind.android:worldwind:0.8.0'

Frees all storage associated with a valid GLUmesh by iterating through its faces, vertices, and edges to release them.

gov.nasa.worldwind.util.glu.tessellator.__gl_meshDeleteMesh(mesh);

Splits an existing edge eOrg into two edges. The new edge eNew is returned and is positioned such that eNew == eOrg.Lnext. The new vertex created by this split is located at eOrg.Sym.Org == eNew.Org.

GLUhalfEdge eNew = gov.nasa.worldwind.util.glu.tessellator.__gl_meshSplitEdge(eOrg);

Creates a new edge from eOrg.Sym.Org to eDst.Org.

• If the edges belong to the same face (eOrg.Lface == eDst.Lface), it splits one loop into two, and the new loop's left face is the new edge's face.
• If they belong to different faces, it merges two disjoint loops into one, destroying eDst.Lface.

// Note: This is a static method in Mesh, but the source shows it as package-private.
// Use via the public __gl_mesh... entrypoints if available in your context.
GLUhalfEdge eNew = gov.nasa.worldwind.util.glu.tessellator.__gl_meshConnect(eOrg, eDst);

The fundamental operation for changing mesh connectivity and topology. It modifies the mesh so that the Onext pointers of two half-edges are exchanged. Depending on the relationship between the edges, this can:

• Merge two disjoint vertices.
• Split one vertex into two.
• Join two disjoint loops into one.
• Split one loop into two.

boolean success = gov.nasa.worldwind.util.glu.tessellator.__gl_meshSplice(eOrg, eDst);

A convenience method that creates a complete minimal mesh component: one edge (as a pair of half-edges), two vertices, and one face (loop). Pass an existing GLUmesh to allocate these components within it.

GLUhalfEdge e = gov.nasa.worldwind.util.glu.tessellator.__gl_meshMakeEdge(mesh);

Performs a self-consistency check on the provided GLUmesh. It validates the integrity of the circular doubly-linked lists for faces, vertices, and edges, ensuring that half-edge relationships (like Sym, Lnext, and Onext) are mathematically sound and that all pointers are correctly assigned.

gov.nasa.worldwind.util.glu.tessellator.__gl_meshCheckMesh(mesh);

Initialize a new, empty GLUmesh structure that contains no edges, vertices, or faces. This serves as the starting point for building 3D geometry using the tessellator's mesh operations.

GLUmesh mesh = gov.nasa.worldwind.util.glu.tessellator.__gl_meshNewMesh();