[caret-users] Translucent fiducial surface?

[David Van Essen]

Hi again!

Just before filing this away, it occurred to me that there might be  
another way that could help you out, depending on your specific needs.

Caret has a Surface: Sections: Section Control option that lets you  
look at 'slabs' of the surface of whatever thickness desired and  
sliced at different angles.

You can set the section numbers, say, to show only frontal cortex.   
Then by rotating the surface you can see part of the backside of the  
lateral surface plus part of the medial surface.  I have confirmed in  
a quick test case that this works, though you may or may not find it  
satisfactory.

David VE


On Jun 29, 2008, at 10:18 PM, David Van Essen wrote:

> Leeland,
>
> You can get translucency by converting to a vtk model using the Save
> option for the Caret coordinate file.  This can also preserve surface
> coloration.  I don't have a lot of experience with this, but John may
> be able to provide additional tips now that he is back from Australia.
>
> David VE
>
> On Jun 26, 2008, at 8:46 AM, Donna Dierker wrote:
>
>> Hi Leeland,
>>
>> I don't think so, but David will correct me if I'm wrong.  (John will
>> return from Australia next week; he would know best.)
>>
>> There is a way under D/C: Surface Miscellaneous to turn the drawing
>> mode
>> to Nodes or Hide Surface, but neither of these will give you what you
>> want.  You could toggle back and forth the Partial View options, but
>> this isn't any better than just toggling Toolbar:L and Toolbar:M to
>> switch sides.  Would selecting Window: Window 2 and setting Window 2
>> to
>> medial view, main window to lateral work?
>>
>> If you actually want to combine/sum the metrics on either side,  
>> then I
>> would generate the sum directly as a new combined metric overlay.
>> With
>> more knowledge of the surface type and how the respective sides
>> relate/align, I could elaborate.
>>
>> Here is an example of how it might work:  Let's say the surface is a
>> sphere.  Metric 1 is good; we like it like it is.  Metric 2 is one we
>> want to flip along some axis and sum with metric 2.  We project
>> Metric 2
>> to a volume via Attributes: Metric.  We either flip the volume along
>> the
>> axis of interest, or we flip the surface and map the volume to the
>> flipped surface.  Now we can sum metric 1 and metric 2 to create
>> metric
>> 3 (sum metric1 + [xyz]-flipped metric 2).
>>
>> I may be way off track, but at least now you know how to steer my
>> thinking.
>>
>> Donna
>>
>> On 06/25/2008 05:30 PM, Leeland Ekstrom wrote:
>>> Hi,
>>>
>>> Is there some way in Caret to alter the opacity of the fiducial
>>> surface
>>> itself (i.e. when viewing a 3D inflated surface, reduce the opacity
>>> of
>>> the surface itself to something like 50%, so that metric blobs on
>>> both
>>> medial and lateral sides of the brain could be seen simultaneously)?
>>> The 'opacity' parameter on the 'Overlay/Underlay - Surface' dialog
>>> seems
>>> to only alter overlays and underlays, and not the base surface  
>>> itself
>>> upon which these different surfaces are visualized.
>>>
>>> Thanks for your help,
>>> Leeland
>>>
>>>
>>
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