[Paraview] Using Threshold

[Eric E. Monson]

Hey Michael,

If you really need non-vertex 2d glyphs that face the camera, hopefully someone can help you get closer to that, but I wanted to mention another option: Point Sprites. If you have a point cloud and change the Representation to Point Sprite, you can go to the Display tab and change the Point Sprite Mode to Texture, then under Point Sprite Texture you can choose Load... and it will let you open an image file to place at every point and they will always face the camera.

Good luck,
-Eric

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Eric E Monson
Duke Visualization Technology Group


On Jul 7, 2010, at 3:37 PM, Michael Cohen wrote:

> On 07/06/2010 09:32 PM, David Thompson wrote:
>>>>> .... I definitely want to break it up into a point cloud, probably using the glyph filter to create a vertex cell at each point. How do I go about this?
>>>> 
>>>> Load your data. Go to the Filters menu and choose "Glyph". When the filter options appear in the Object Inspector panel, set the "Glyph Type" to "2D Glyph". Then, a "2D Glyph" box will appear. Select "Vertex" in its drop-down menu and click the filter's Apply button.
>>>> 
>>>> Note that if you have more than 5000 points, you'll need to turn off the "Mask Points" option or it will randomly choose 5000 points and only output those (this was done so that rendering of large datasets would be possible, but since you plan to subset the output of the Glyph filter with a Threshold filter there is no need to mask points).
>>> 
>>> ... Also, when I do regular 2D glyphs, I find that they are flat and only properly visible when the camera is looking down on them from the z-direction.  How do I ensure that the glyphs are always properly visible to the camera?
>> 
>> Michael,
>> 
>> As far as I know, there is no way to do this in ParaView. You can use a vector field to orient the 2-D glyphs at each point, but their orientation is fixed relative to the dataset not the camera.
> 
> Ok, is there a way of telling the vector heading of the current camera position?
> 
> Michael
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