- 2.4.0:
  - **Major updates**
    - New refraction channel for Standard material (including fresnel support). Refraction texture can be provided by a reflection probe or a refraction texture. [See demo here](http://www.babylonjs.com/Demos/refraction/) ([deltakosh](https://github.com/deltakosh))
    - Added support for HDR cubemaps ([sebavan](https://github.com/sebavan))
    - Support for shaders includes ([deltakosh](https://github.com/deltakosh))
    - new mesh type : `LineSystem` ([jerome](https://github.com/jbousquie))
    - SerializationHelper for complex classes using TypeScript decorators  ([deltakosh](https://github.com/deltakosh))
  - **Updates**
    - New OnPickTrigger support for spritesManager ([deltakosh](https://github.com/deltakosh))
    - New SPS method `digest()` ([jerome](https://github.com/jbousquie))    
    - New SPS property `computeBoundingBox` ([jerome](https://github.com/jbousquie))  
    - Added a new OnPickOut trigger fired when you release the pointer button outside of a mesh or sprite. ([deltakosh](https://github.com/deltakosh))
    - Added support for OnPointerOver and OnPointerOut for sprites. ([deltakosh](https://github.com/deltakosh))
  - **Bug fixes**
    - Fixed bug with ArcRotateCamera.setTarget ([deltakosh](https://github.com/deltakosh))
  - **Breaking changes**
    - `VertexData.CreateLines()` removed as `MeshBuilder.CreateLines()` now calls `MeshBuilder.CreateLineSystem()`