On Thursday, Sep 2, 2004, at 07:28 America/New_York, Chris Pelkie wrote:
Only positions must be float, data can be most anything. However, it looks like you only really need positions for your plot (unless you are coloring by a 'data' parameter also? or are those 2 different data sets in the image?). BTW, your tiff file is huge in size but small in pixels. DX doesn't LZW compress so you may want to post-process with some graphics tool to crunch these down.________________________________
Yes, read up on Include which would permit you to 'exclude' points outside your range. You do the calculation you propose by:
Mark("positions"); //makes a copy of 'positions' in the 'data' component
Compute(mag(a) > b); //provide the field to the 'a' input and some scalar value to 'b', like a Scalar Interactor
Include(min=1, max=1,cull=1)
Do not Unmark or the flag values (0|1) will overwrite the 'positions'.
If you do have 'data' that needs to be available after Include, this problem gets trickier to manage, so write again.
Chris Pelkie
Vice President
Conceptual Reality Presentations, Inc.
30 West Meadow Drive
Ithaca, NY 14850
