[Chimera-users] Silhouettes and depth cueing

Tom Goddard goddard at sonic.net
Mon Nov 2 12:42:40 PST 2015


Hi Oliver,

  In Chimera 2 we can try to have silhouette edges fade with depth.  I’ve attached an example from Chimera 2 where the edges fade and where they don’t fade.  Chimera 1 uses a stencil buffer approach to drawing the edges with old-style OpenGL graphics without shader programs and the depth information is lost.  It would be harder to do in Chimera 1.  I’ve submitted a feature request for Chimera 2 to fade the edges.

	Tom




> On Nov 2, 2015, at 8:21 AM, Oliver Clarke wrote:
> 
> Hi all,
> 
> I’ve noticed that the intensity/color of silhouettes does not vary with depth cueing the way everything else does - normally this is fine, except when one is showing a slab of a structure - fragments of secondary structural elements which would otherwise blend into the background tend to become overly emphasized by the presence of silhouettes. The obvious solution to this for now is to turn off silhouettes when making these kinds of figures, but I quite like the effect that silhouettes provide, so I would rather not do so if there is an alternative. Perhaps in Chimera 2 it may be worth considering applying a depth dependent factor to the silhouette color (so it fades into the background color as it approaches the yon clipping plane)?
> 
> Cheers,
> Oliver.
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