Version 3.5

[gwaldron]

Release Highlights:

• New osgEarthCesium nodekit using the cesium-native SDK for 3D-Tiles integration
• Upgrades to the TerrainConstraintLayer for better meshing, performance, and support for 3D model constraints
• New TerrainMeshLayer for "bring your own" terrain surface meshing
• Integration of spdlog logging SDK (optional)
• Various updates to the osgearth_imgui panels
• Updated Triton and Silverlining shader sets

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This discussion was created from the release Version 3.5.