Hi,

I'm trying to vary the transparency of a cube during the simulation 
execution.

I define the following....

public sim.portrayal3d.simple.CubePortrayal3D representation;
representation = new sim.portrayal3d.simple.CubePortrayal3D(colour,size)


And then attempt to change the transparency by...

representation.appearance.getTransparencyAttributes().setTransparency(1.0f);


I noticed that nothing was appearing, looked like the cubes had 0 
transparency.

Surrounding the setTransparency call with a try catch I realised the 
follow exception was being thrown...

javax.media.j3d.CapabilityNotSetException: Appearance: no capability to 
get transparencyAttributes


Looking into CubePortrayal3D.getModel I found the following...

131: Shape3D localShape = new Shape3D(quadArray,appearance);
132: localShape.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);

Which should allow you to change the appearance properties of the Shape3D.

However, is the problem that I'm calling getTransparencyAttributes() 
when localShape.setCapability(Shape3D.ALLOW_APPEARANCE_READ); has not 
been set?

Or I'm I going about this all the wrong way? How should I change the 
transparency of a CubePortrayal3D (or more generally any Portrayal3D).

Thanks

-- 
Michael Lees


This message has been checked for viruses but the contents of an attachment
may still contain software viruses, which could damage your computer system:
you are advised to perform your own checks. Email communications with the
University of Nottingham may be monitored as permitted by UK legislation.