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.
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.
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