[Sidefx-houdini-list] Surface from image stack

Jerry jerry at axyzfx.com
Thu Feb 11 16:29:58 EST 2010


Check the second tab on the trace SOP.

> Hola~
>
>> -- On Thu, Feb 11, 2010 at 03:19:05PM -0500, Mark Elendt wrote:
>> On Thursday Feb 11 at 14:46, Mark Bolstad wrote:
>> > I have a stack of black and white images that consist of a set of
>> > disconnected circle like shapes. First, how do you extract the  
>> boundary
>> > curve(s) and pass them to a SOP?
>> >
>> > Second, given a set of these extracted curves, I need to join them  
>> into a
>> > surface (assume some fixed offset between the curves). The problem is  
>> that
>> > in some cases I'll have two curves on one level and 1 curve on the  
>> next
>> > level (the actual data is bifurcating somewhere in between the  
>> levels).
>> >
>> > The application is reconstructing neurons from a set of electron  
>> microscopy
>> > images.
>> >
>> > Any help is appreciated.
>>
>> Could you make a volume (even an i3d file)?
>> The ISO SOP with an inside/out expression?
>>
>> If the topology changes (i.e. you have two circles blending to one),
>> that could be problematic.
>>
>> If you are guaranteed to have only one circle, then use the trace SOP
>> and poly loft (or poly spline and skin).
>
> Is there a way to get a true curve out of trace? Trace wants to surround  
> each
> pixel with a poly face, as opposed to generating a curve that connects  
> the
> pixels above the threshold, right?
>
> MO
>
>>
>> --
>> Mark Elendt
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>





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