Hi Tim, A workaround may be to create your own color map which includes alpha values. In Object Inspector, Display tab, Color panel, Edit Color Map... you can choose from a set of preset color maps, and Import your own. I have used Export on an existing one to save as xml, then edited or written new xml color map, and Imported that although I never played with alpha values. I have noticed in the interactive Color Scale Editor GUI some color maps allow you to interactively set alpha while at other times they do not ! Perhaps something to do with the type of dataset? In which case you may be stuck? ie volumes allow alpha, surfaces don't? You might even try interactive editing first, by clicking in the color bar in the Color Scale Editor you can add new points, dragging those up or down changes opacity, as does manually entering a value in the Opacity box, but sometimes that is disabled. Someone out there must know the reasons behind this? but perhaps there are enough clues here for you to make something work for you.
cheers Dave David Pont Scientist - Forest Management Science Scion 49 Sala Street, Private Bag 3020, Rotorua 3046, New Zealand DDI +64 7 343 5663 www.scionresearch.com<http://www.scionresearch.com/> [cid:[email protected]] From: [email protected] [mailto:[email protected]] On Behalf Of Moreland, Kenneth Sent: Sunday, 13 February 2011 7:16 p.m. To: [email protected]; [email protected] Subject: Re: [Paraview] Transparency based on scalar 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" <[email protected]> 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 _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview **** Kenneth Moreland *** Sandia National Laboratories *********** *** *** *** email: [email protected] ** *** ** phone: (505) 844-8919 *** web: http://www.cs.unm.edu/~kmorel ________________________________ Discover Scion at SCIENCE IN THE PARK - our free open day. Saturday 12 March 2011, 9am to 3pm, 49 Sala Street, Rotorua. www.scionresearch.com/science-in-the-park This e-mail and any attachments may contain information which is confidential or subject to copyright. If you receive this e-mail in error, please delete it. Scion does not accept responsibility for anything in this e-mail which is not provided in the course of Scion's usual business or for any computer virus, data corruption, interference or delay arising from this e-mail.
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_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
