[Bf-cycles] Cycles range mapping math node

[Mohamed Sakr]

ah, sorry if I mentioned a constant examples, other examples can be max is
not constant "unknown".

On Sat, Jun 11, 2016 at 9:20 AM, gandalf3 <zzyxpaw at gmail.com> wrote:

> 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> 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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