Filters

By
Dave
Project
Published
14 Mar 2011 23:19
Last Modified
13 Jan 2013 17:36

I wanted to be able to view the sky and planets using different wavelengths of light, and a convenient way to achieve this was by the use of "filters", as shown below in Figure 1.

H-Alpha Filter

Figure 1. H-Alpha Emmision Filter.

This enables me to either adjust the camera orientation while keeping the filter in fixed position, or move the filter around a while keeping the camera orientation fixed (or a combination of both), and see the relevant portion of the sky in a different wavelength. By ajusting the opacity scale it is possible to see how items relate to each other in different wavelengths (for example an area of H-Alpha emmision originating from particular star or deep-sky object in the visible spectrum).

The approach I am currently taking is to render the view in each wavelength, and create opacity masks which I can use to blend the views together. In this way I can use multiple filters of arbitrary shape and size.

Comments

By
Joe Farro
29 Apr 2011 07:51
These filters are awesome! We may use that concept/technique for a number of other projects on Surface..keep up the great work!
By
Dave
2 May 2011 23:16
Thanks Joe, great to hear...will do! :)
By
Frederik
3 Mar 2014 11:10
Hey Dr Dave,
I do not have these filters on NUIverse...when I make a new tag in the "tags.xml" called filters, there just comes an unvisible menue on the NUIverse surface.
I saw that there are other menues ("reticles", "compasses" etc.) declared in the config file...except of the filter menue. how can I add it?

Regards,
Frederik

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