Merge remote-tracking branch 'upstream/master' into topic-terra
Added CullingUtils::ProxyCullVisitor that lets you run a cull pass on a subgraph using a proxy frustum (to support clamping); Various speedups and improvements to the OverlayDecorator; Integrated ECEF into SpatialReference (call srs->getECEF() and do normal transform calls); Fixes to the ECEF calculations to account for differing ellipsoids during transformation; Improvements to the edge-normalization in quadtree when sample_ratio != 1.
PolygonizeLines: add support for large areas by properly calculating normals and transforming buffering vectors into the normal-local plane. Updated ECEF to automatically generate normal vectors while transforming verts to ECEF.
Added initial sphinx documentation
Merge branch 'master' of https://github.com/gwaldron/osgearth
Readthedocs push
viewer: removed test code
Merge branch 'master' of github.com:gwaldron/osgearth
Update docs/source/index.rst
Update docs/source/index.rst
Update docs/source/index.rst
Update docs/source/index.rst
Docs: add base files
Update docs/source/index.rst
docs update.
Merge branch 'master' of github.com:gwaldron/osgearth
Controls: added a ButtonControl (which is just LabelControl with some defaults)
LRUCache: fix an obscure multithreading problem
Color: add as() function
Docs: added compilation docs