[Paraview] Transparency based on scalar

[Moreland, Kenneth]

If I understand your question, this is not directly supported.  Although in volume rendering you can set opacity based on the scalar value, in surface rendering you cannot.  There is an entry in ParaView UserVoice for this feature.  If you feel ParaView should support this feature, you should go to this UserVoice link and vote for it.  It will help ParaView developers determine which features to next implement.

http://paraview.uservoice.com/forums/11350-general/suggestions/1354583-transparency-opacity-in-surface-color-map?ref=title

It may be possible to have a filter to create a field of colors with alpha value and then render dependent colors.  I know of no existing filters that already do that, though.

-Ken


On 2/11/11 6:48 PM, "Tim Gallagher" <tim.gallagher at gatech.edu> wrote:

Hi,

I would like to set the transparency of something based on a scalar. For example, if I took a Slice of a dataset, I would like to make it transparent based on, say, density gradient such that zero-gradient is transparent and some value indicates opaque.

I haven't seen any existing filters to indicate this is possible. Is there a filter that does it? Is it something that's even possible to do through, say, a programmable filter?

We're just getting into scripting with Paraview and it takes us a long time to figure out how to even do simple things, so before I spin my wheels on this one, I'd like to get some expert opinions on if it's even feasible.

Thanks,

Tim
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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
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