[solved] how to color particles using infr-red color scheme?

oat · Houdini Expert Joined: 24 Dec 2009 Posts: 386

suppose I have a group of particles, each having a point attrib "DF"

How to color these particles using the infr-red color scheme for the value range from the minimum "DF" value to the maximum “DF" value? something like the color image below...

thanks!

Ji

zarti · Posted: Sun Dec 25, 2011 9:09 pm GMT Post subject:

hi ,

here im uploading a file which might be useful ; with the VopSOP you can have more control over the colours .

im posting also the simple python otl which i used in the file , since i do not know yet how to include it in the 'scene' .

oat · Houdini Expert Joined: 24 Dec 2009 Posts: 386

Thanks a lot, zarti!

pls see my update below.

the 1st image shows the interior space with Daylight Factor (a measure of daylight quality) value between 2% and 3%

the 2nd image shows the interior space with Daylight Factor larger than 2%

Ji

zarti · Posted: Mon Dec 26, 2011 12:18 pm GMT Post subject:

hi Ji ,

on a side note ;
in the example i posted above , the range of color ramp fits within the whole range of "DF" attribute .

normally , applying colors in this way , isn't correct ( my example simply used min and max of DF values to define the range ) . this might be more noticeable if you had a sequence of animated .CSV files and min or max values wd change , i imagine .

anyway , you can delete imported min and max of detail attributes that are inside the VopSOP and replace the both Minimum & Maximum Value in Source with parameters to be promoted one level up . from there you can use your custom ( exact ) values to precisely ( min&max independent ) spread the colors .

--

again , interesting usage

=)

oat · Houdini Expert Joined: 24 Dec 2009 Posts: 386

Hi zarti, I understand your advise and i agree that defining a fixed min and max value for color scheme is important for animating a serious of csv files.

wish u and the houdini community a happy new year!

Ji

zarti · Posted: Mon Dec 26, 2011 12:57 pm GMT Post subject:

thanks Ji ! best wishes to you too !