[Paraview] Advice sought on proper color value storage for custom filter

[Mike Jackson]

I do have 12 buttons in my custom GUI that allow the user to change  
each category color.

In looking through some prior vtk code that I had written I was  
thinking that I could attach a color table to an actual data set.  
Turns out I didn't remember correctly and you attach a lookup table  
to a "Mapper" object instead.

Thanks for the thoughts.

--
Mike Jackson
imikejackson & gmail * com

On Mar 26, 2008, at 10:24 AM, Kent Eschenberg wrote:
> 1 locks you to a colormap. 2 lets the user change the colormap as  
> the display media and context change.
>
> Kent
> Pittsburgh Supercomputing Center
>
> Mike Jackson wrote:
>> I am writing a custom reader + filter for my customer. For  
>> conversations sakes lets say the data (unstructured grid) could be  
>> in one of 12 categories. The customer wants to be able to set a  
>> custom display color for each of the categories. I think there are  
>> a few different ways to go about this but I am not sure of the pit  
>> falls of either way.
>> 1: Add a 3 component scalar array to the data set that holds the  
>> RGB value that the cell would need. (Which category the cell is in  
>> is determined as the filter runs). I believe ParaView will  
>> interpret this as RGB colors and "Do the right thing"
>> 2: Add a single component scalar value that holds which category  
>> the cell belongs to and then have the user load a custom color  
>> lookup table from the disk.
>> 1 seems easier for the end user but would seem to take up more  
>> memory.
>> 2 seems less easy (Manually have to load a custom color xml file)  
>> but may take less memory because I am storing 1 byte instead of 3.
>> Any one have any thoughts on this?
>> Thanks in advance.
>> -- 
>> Mike Jackson
>> imikejackson & gmail * com