[yt-users] Oblique slices

[Carolyn Peruta]

Sorry everyone, ignore that last email.  The transfer function is different.   Oops!

On Jun 20, 2011, at 2:36 PM, Carolyn Peruta wrote:

> Interesting...there is no off-axis projection section in the online docs.  It looks like someone may have accidentally replaced it with a second copy of the volume rendering section.
> 
> 
> On Jun 20, 2011, at 2:19 PM, Cameron Hummels wrote:
> 
>> Hi Carolyn,
>> 
>> This is a normal behavior of oblique slices.  Recall what a slice is--the values of a plane slicing through the dataset.  When you perform a slice that isn't aligned with one of the axis directions like x, y, or z, you get these artifacts as the slicing plane cuts through different 'layers' of the 3D grid.  It effectively behaves like a step function as it steps depthwise through these grid cells.
>> 
>> If you want to avoid this behavior, I recommend using off-axis projection, which is basically like a slice, but thicker, so it covers multiple grid cells depthwise and sums these up, thereby minimizing this step function behavior.
>> 
>> Cameron
>> 
>> 
>> On 6/20/11 2:04 PM, Carolyn Peruta wrote:
>>> Hello YT fans!
>>> 
>>> When I make oblique slices on a warped disk (using the angular momentum vector as a normal), I'm getting some odd step-like features:
>>> 
>>> http://galactica.icer.msu.edu/~cperuta/data/face_CuttingPlane__Density.png
>>> 
>>> Here is the edge-on view:
>>> 
>>> http://galactica.icer.msu.edu/~cperuta/data/edge_CuttingPlane__Density.png
>>> 
>>> Should I be worried about the way this looks or is it an artifact of the oblique slice?
>>> 
>>> Best,
>>> 
>>> Carolyn
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