[Sidefx-houdini-list] Using color to visualize 2 float values

Georg Duemlein rdg at preset.de
Fri Sep 9 17:59:24 EDT 2011


Here's an example using three colors to visualise three values:
http://awesome.good.is/transparency/web/1101/census-data/transparency.jpg
Note the 'how to read this section' in the lower left corner.
Looks pretty academic/intellectual.

A full discussion of this approach can be found here:
http://www.visualisingdata.com/index.php/2011/01/discussing-are-the-richest-americans-also-the-best-educated/




On Sat, 10 Sep 2011 09:18:50 +1200, Georg Duemlein wrote:
> Hey Rob,
>
> Back to your original questions.
>
> I guess HSV is your best bet - you can remap the V to not go below
> 25% to avoid the blackness.
> So far for theory. It still depends what your float represent - I
> doubt there's a generalized approach.
> Even Hue might be hard to interpret.
>
> http://www.perceptualedge.com/articles/b-eye/choosing_colors.pdf
> Edward Tufte: “…avoiding catastrophe becomes the first
> principle in bringing color to information: Above all, do no harm.”
> (Envisioning Information,
> Edward Tufte, Graphics Press, 1990)
>
>
>
> On Fri, 9 Sep 2011 10:49:22 -0700, Robert Kelly wrote:
>> That is not quite what i was asking about.... But that is still 
>> really
>> cool! and will probably solve the problem. I was asking if anyone 
>> has
>> found a mix of rgb or hsv that is easy to see the mix of two values 
>> in
>> a colour. But as i said this probably will do the trick.
>>
>> On 9 September 2011 08:43, Nick Zutphen <nvanzutphen at live.com> 
>> wrote:
>>> Awesome :-)
>>>
>>> Nick van Zutphen
>>> ----
>>> http://www.nickvanzutphen.com
>>>
>>> On Sep 9, 2011, at 5:37 PM, Nick Zutphen wrote:
>>>
>>>> Sounds interesting, but where can I find 'the viewport_menu'?
>>>>
>>>> Cheers!
>>>> Nick van Zutphen
>>>> ----
>>>> http://www.nickvanzutphen.com
>>>>
>>>> On Sep 9, 2011, at 4:15 PM, Nicolas Delbecq wrote:
>>>>
>>>>> That's extremely useful...
>>>>>
>>>>> Thanks a lot :))
>>>>>
>>>>> 2011/9/9 Alvaro Castaneda <varomix at gmail.com>:
>>>>>> nice one Mark, I totally forgot about that toolbar
>>>>>> thanks
>>>>>>
>>>>>> On Fri, Sep 9, 2011 at 9:09 AM, Mark Alexander 
>>>>>> <malexander at sidefx.com>wrote:
>>>>>>
>>>>>>> Hi Robert,
>>>>>>>
>>>>>>> If you open up the Correction toolbar in the 3D viewport, you 
>>>>>>> also get the
>>>>>>> same channel controls as in MPlay (viewport_menu>Correction 
>>>>>>> Toolbar). Note
>>>>>>> that you'll need shader support to do this, but all recent 
>>>>>>> cards have it.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> M.
>>>>>>>
>>>>>>>
>>>>>>> On 09/09/2011 08:51 AM, Alvin Yap wrote:
>>>>>>>
>>>>>>>> Do you need to view it in RGB? If I were viewing in mplay, I'd 
>>>>>>>> switch to a
>>>>>>>> single channel view, like just red or blue to visualize just 
>>>>>>>> one of those
>>>>>>>> channels at a time.
>>>>>>>>
>>>>>>>> Alvin
>>>>>>>>
>>>>>>>> On Thu, Sep 8, 2011 at 5:10 PM, Robert 
>>>>>>>> Kelly<isstuff at gmail.com>  wrote:
>>>>>>>>
>>>>>>>> Has anyone come up with a way to visualize 2 float values in 
>>>>>>>> the colour
>>>>>>>>> value of geometry that is easy to read visually. Some of you 
>>>>>>>>> are saying 2
>>>>>>>>> ha! I can visualize 3 just stick them in r g and b but the 
>>>>>>>>> colors
>>>>>>>>> interact
>>>>>>>>> and our brains don't see in r g b so the information doesn't 
>>>>>>>>> come across.
>>>>>>>>> I
>>>>>>>>> have tried playing with HSV but if one value is black it 
>>>>>>>>> hides
>>>>>>>>> information
>>>>>>>>> of the other channel.
>>>>>>>>>
>>>>>>>>> So the question is
>>>>>>>>> What is Your way that you think reads clearly of using Cd to 
>>>>>>>>> visualize 2
>>>>>>>>> floats?
>>>>>>>>>
>>>>>>>>> I look forward to a bunch of ways of doing this one.
>>>>>>>>>
>>>>>>>>> Sent from my tiny puter.
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-- 
Georg Duemlein
http://rdg.preset.de



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