Hi,
Chris Pelkie <[EMAIL PROTECTED]> writes:
> How are you using DXLInput? It doesn't seem necessary. Maybe you are doing
> something interesting that we should hear about. (;-)
I saw it in some tutorial and thought that I need that. It works fine without
it; thanks.
> Re your question: why not import u and v as 2-vector float data on the
> 2-vector
> positions? Seems to me that Streamline requires a vector field and you are
> providing it a scalar field (U) and another (V).
> You need to learn about Print, esp. Print("rd") which can be attached to any
> output to see what is flowing in the 'pipes'.
Thanks, now it is connected to my image-output. I only have to find out what it
wants me to tell.
>
> This will determine the type of object. I suspect you are getting a Group of 2
> Fields, which is a general purpose object and not a suitable input to some
> modules that can't deal with arbitrary polymorphs like Group. So first try
> Select(0) on the output of Import, prior to Streamline.
Sorry, but I don't understand this :-(
> But I still think you want to join U and V to make [U,V].
I did this; I changed U and V to a 2-Vector-float. Now, I have a nice
'AutoGlyph'-Output, but still 'Streamline' has problems:
Streamline: Missing data: connections
Isn't that strange!?
Greetings!
Fabian
>
> On Wednesday, Jun 9, 2004, at 10:50 America/New_York, Fabian Braennstroem
> wrote:
>
> Hello,
>
> I am still doing my first steps with OpenDX. Now, I see at least my first 2D
> velocity data with those easy to use 'AutoColor', 'Rubbersheet',...
> Unfortunately I still have a problem with streamlines.
>
> My import-data have following easy structure
>
> 1 1 x x
> 2 1 x x
> 3 1 x x
> 1 2 x x
> 2 2 x x
> 3 2 x x
>
>
> The columns represent the x-, y- coordinates and the u-, v-velocities at those
> points.
> To read in those data I use following general-file:
>
> file = /home/fab/opendx.dat
> grid = 3 x 2
> format = ascii
> interleaving = field
> majority = column
> field = locations, field0, field1
> structure = 2-vector, scalar, scalar
> type = float, float, float
>
> end
>
> To display the velocities with a rubbersheet, I use the modules:
> DXLInput, Import, Rubbersheet and Image. That works fine without any further
> adjustment.
> Then I thought I could do the same to display streamlines, but there I get
> following error-message:
>
> Begin Execution
> ERROR: Streamline: Bad parameter: data must be a field, multigrid, or
> composite
> field
>
> Does this mean that I have a wrong general-file? If so, am I not able to use
> the same general-file for different visualizations?
>
> Greetings!
> --
> Fabian Braennstroem
> Duesseldorf/Berlin
