GitLab

These runtime warnings are not helpful, it may be intentional to have
an object that sometimes does not contain entities of a specific kind,
without changing the drawmode when this happens.

```
warning: numIndices is 0 in renderobject: VolumeMeshNodeVertices
warning: numIndices is 0 in renderobject: VolumeMeshNodeFaces
warning: numIndices is 0 in renderobject: VolumeMeshNodeEdges
```

Fix open volume mesh core picking

See merge request !12

implements picking for core profiles

and adopted shader loading with generator

fixed a problem with the lastDrawMode not being initialized when picking

Closes #1

See merge request !11

renderer is used at startup. fixes #1

implementation for core profiles.
* Implemented first variant for picking volumeḾeshvertices in core
profiles.

remaining impementation to improve maintainability

vertexDeclaration

fixed old shaders were used in core profile.

See merge request !9

Use new ovm copy constructor instead of copying the pointer

See merge request !8

trust object type and avoid dynamic_cast due to cross-library RTTI trouble.

See merge request !5

added drawmode faces_colored_flat_shaded

See merge request !4

Add VolumeMeshObject const mesh getter

See merge request !6

Update OVM

See merge request !3