[Chimera-users] VRML rendering options?
gregc at cgl.ucsf.edu
Fri Jan 18 09:56:38 PST 2008
On Fri, 18 Jan 2008, Nils Becker wrote:
> I have been using Chimera for a while and find it great software. Now I
> am trying to include my own VRML models and show them together with PDB
> data. I succeeded in opening an externally generated VRML 2.0 file.
> Since the VRML file contains colored boxes, the standard smooth
> rendering is not appropriate.
> Is there a way to influence the rendering style?
> Also, is there a way to switch on a fixed transparency (alpha value) for
> the whole VRML model, on a per-model basis?
> Any help would be appreciated!
> Cheers, Nils
Currently, the per-model transparency is not exposed to Python, so it
can't be modified by the user interface. I will look into how hard that
would be to fix. A better solution would be to add support for VRML3,
a.k.a., X3D, ColorRGBA nodes.
Now rendering styles:
VRML lets you specify per-vertex normals for smooth rendering or per-face
normals for faceted rendering. So in an IndexedFaceSet, you would set the
normalPerVertex field to be FALSE and give a normal for every face. For
VRML Boxes, you get faceted rendering only (because a smooth rendering
would be a (squashed) Sphere). The VRML specification can be found at
Hope this helps,
UCSF Computer Graphics Lab
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