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

Georg Duemlein rdg at preset.de
Fri Sep 9 17:18:50 EDT 2011


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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