[Bf-cycles] Cycles range mapping math node

[gandalf3]

If I'm not mistaken, in such a case as you describe (where the max is a 
known constant and the min is 0), all that's needed is a single division 
math node.

It's worth noting that a normalize node like the compositor has would 
also cover this use-case (and other, more complex situations 
<http://blender.stackexchange.com/q/34582/599> as well)


On 06/11/2016 12:03 AM, Mohamed Sakr wrote:
> @ gandalf3, well, consider any thing like particle radius or particle 
> index, it ranges from 0 to a value > 1
> with a node like this, you can remap the values of all particles to 
> 0-1, which will help the user use color ramp more efficiently "as he 
> knows that the range is 0-1, not by trial and error testing.."
>
> same for any other texture, like volume textures that got values > 1, 
> remapping them would be handy.
> @ carlo, your range mapping is more general, my idea is more toward a 
> normalize node "that takes a texture and normalize to the texture max 
> value".
>
> On Sat, Jun 11, 2016 at 6:18 AM, gandalf3 <zzyxpaw at gmail.com 
> <mailto:zzyxpaw at gmail.com>> wrote:
>
>     This is doable with a node group, but a built in node to match the
>     compositor would be nice.
>
>     However, what can't be done with a node group is a *normalize*
>     node (like the compositor), as this requires calculating the min
>     and max values, which AFIAK can't be done with math nodes. How
>     feasible would it be to implement such a node?
>
>
>     On 06/10/2016 07:21 PM, Mohamed Sakr wrote:
>>     Hi,
>>
>>     is there a range mapping math node in Cycles?
>>     consider a texture input "or any attribute", it is an array of
>>     data, ranging [start, end], this node will do a pre-calculation
>>     to a new texture using the required range [newStart, newEnd].
>>
>>     this will help a lot.
>>     I can do it, just need a hint on: where to write the new
>>     functions "which files/functions that are related to writing a
>>     new node".
>>
>>     and any suggestions would be helpful.
>>
>>     cheers,
>>     Mohamed Sakr
>>
>>
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>
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