[vtkusers] Rendering multiple volumes

[Lisa Avila]

Do you mean that the volumes overlap in 3D space, or just overlap in image
space? If the volumes overlap in image space (two disjoint volumes where
sometimes one is in front of the other) VTK does render this correctly (you
need to turn back to front rendering on in the culler in the renderer). It
is true that VTK does not correctly handle volumes that overlap in 3D
space, unless they are aligned and part of the same volume (multiple
components in one vtkImageData).

Lisa


On Thu, Oct 29, 2015 at 11:59 AM, Weiguang guan <guanw at rhpcs.mcmaster.ca>
wrote:

> There were a few posts in the past about this topic. The conclusion seemed
> to be that VTK didn't support multi-volume rendering in terms of proper
> visibility sorting/blending. I'm not sure it is still true.
>
> I've done a test where two partially overlapped volumes are used. I've
> found that only the texture mapping mapper can render them correctly. All
> the other mappers (GPU based or ray casting) always have one volume occlude
> the other one no matter what direction the camera is viewing.
>
> Is vtkImageOcclusionSpectrum designed for handling multiple volume
> rendering? Any comments will be appreciated. Thanks.
>
> Best,
> Weiguang
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