[Chimera-users] X3D to VRML conversion

Thomas Goddard goddard at cgl.ucsf.edu
Tue Aug 1 13:09:34 PDT 2006

> Date: Tue, 01 Aug 2006 12:27:52 -0700
> From: Ben Morris
> Hey Tom,
> Were you using the chimera VRML viewer when you tested the new x3d2vrml 
> output? I had the same exact problem in my testing of the code before 
> submitting it, and Conrad told me that the Chimera vrml viewer is less 
> than perfect when it comes to complex geometry (surfaces and ribbons). I 
> don't know if you were using Chimera, or even if it is the only problem, 
> but when I tested the code using a third party viewer, ribbons and 
> surfaces worked fine!
> ~Ben

Hi Ben,

  Yeah, I tested Chimera VRML output by reading it back into Chimera.
I agree that the fact that ribbons did not display properly could very
well be a problem with the Chimera VRML renderer rather than the output.

  I just displayed a Chimera round ribbon (1a0m) using FreeWRL 1.15 on
Linux and it displayed correctly.  It gave about 30 warnings like the
following which may or may not be important:

	WARNING -- node Normal may not be ok as a field of type normal
	(...called from VRML::Field::SFNode, 1363)

  It sounds like you are the one who have worked on the Chimera VRML
output rather than Greg.  Thanks for working on this.  I think it will
be useful to many people.


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