multi-field volume projection?
Hi all, I may be asking something that is obvious to others, but it's not to me. It is it possible to have more than one data field displayed in a single volume projection image? Say, each with a different color map? If so, how? Thanks! -- Stephen Skory s@skory.us http://stephenskory.com/ 510.621.3687 (google voice)
Hi Stephen, It is not currently possible to do this with the existing framework. That said, I think you might be able to do a decent job just blending two separate renders together. The difficulty in doing two fields on the fly (in addition to building the framework to do so) would be finding a balance between the two separate alpha channels so that one didn't dominate the other. Anyways, while it isn't possible now, you may want to add it as a feature request for a future project. Best, Sam On Sun, Oct 30, 2011 at 10:20 PM, Stephen Skory <s@skory.us> wrote:
Hi all,
I may be asking something that is obvious to others, but it's not to me. It is it possible to have more than one data field displayed in a single volume projection image? Say, each with a different color map? If so, how? Thanks!
-- Stephen Skory s@skory.us http://stephenskory.com/ 510.621.3687 (google voice) _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
Stephen, Sam is right -- as of right now you cannot, for instance, have a volume rendering blend a "jet" colormap for density with a "hot" colormap for temperature. I don't think it makes much sense to expect the ColorTransferFunction to return a "multi-field" image unless the multiple fields were combined into a single field. You can use multiple fields in the generation of a single image, by weighting and so on -- similar to how the PlanckTransferFunction works. You can also project multiple fields simultaneously in a volume rendering with the ProjectionTransferFunction. This will give you an image whose first channel is one field, second is another, for instance. Then you can either blend these as two independent channels together, with a function such as or similar to multi_image_composite, or create a 2D colormap and use that. -Matt On Mon, Oct 31, 2011 at 12:33 AM, Sam Skillman <samskillman@gmail.com> wrote:
Hi Stephen, It is not currently possible to do this with the existing framework. That said, I think you might be able to do a decent job just blending two separate renders together. The difficulty in doing two fields on the fly (in addition to building the framework to do so) would be finding a balance between the two separate alpha channels so that one didn't dominate the other. Anyways, while it isn't possible now, you may want to add it as a feature request for a future project. Best, Sam
On Sun, Oct 30, 2011 at 10:20 PM, Stephen Skory <s@skory.us> wrote:
Hi all,
I may be asking something that is obvious to others, but it's not to me. It is it possible to have more than one data field displayed in a single volume projection image? Say, each with a different color map? If so, how? Thanks!
-- Stephen Skory s@skory.us http://stephenskory.com/ 510.621.3687 (google voice) _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
_______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
participants (3)
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Stephen Skory