Add a Shader ball to the Material Editor
superseed !5211 (closed)
This MR brings an optional Shader Ball to the material editor. This allows to get an overview of the current material without having to apply it on the full rendered scene. For performance reasons, this Shader Ball start hidden.
Also fix the vtkOSPRayMaterialLibrary to handle VEC4 and ignore FLOAT_DATA
Edited by Charles Gueunet