Rendering output

[mclarsen]

I suggest that we move the png encoder out of vtkh and back into ascent. To be as generic as possible, we should create a 2d structured data set representing the image as the output.

[utkarshayachit]

sounds reasonable. I see vtkh/rendering/Renderer.cpp includes the header but doesn't use it, but vtkh/rendering/Image.cpp uses it.

[mclarsen]

Good observation. I need to remove that header. The Image class is meant to support the compositing infrastructure only. Its main functions are to compositing with other images and to copy and write image subsets.

[mclarsen]

header removed.