Yep it is possible, but you wouldn't want to do it because each
calculation of the maximum value would be running across N points to
calculate that. That'd make it an O(N^2) operation, albeit spread over
multiple threads.
It might seem like a pain to have to do this in advance using an
Attribute Promote, but by doing so, it's actually forcing you to work in
a more efficient way. Go with it ;)
On 06/03/2017 16:32, Christopher Crouzet wrote:
It /is/ possible to retrieve the maximum value in a VOP since nothing
stops anyone from manually iterating through all the points of the
geometry. This kind of operation might be more suited in “detail” mode
though.
Also, having the ramp normalized to the [0, 1] range in both the X and
Y axis is usually “workarounded” by adding a float parameter for the
amplitude (Y axis) that is used as a global multiplier (making later
tweakings convenient!), and a float2 parameter for the target range (X
axis) that is then remapped using `fit("my_ramp", 0.0, 1.0, range_min,
range_max)` (which is also convenient for later tweakings!).
Now, if you really want to have an actual FCurve, then just create a
simple float parameter, add all the keys however you want, then query
it in using `chf("my_param", the_time_in_seconds)` in VEX/VOP, or
using the equivalent expression.
On 6 March 2017 at 23:29, Jonathan Moore <[email protected]
<mailto:[email protected]>> wrote:
Fabricio ,
The Attribute Promote help page has approx 15 examples you can
load. Hopefully you might find something within the examples to
inspires a solution.
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of
*Olivier Jeannel
*Sent:* 06 March 2017 15:56
*To:* Official Softimage Users Mailing List.
https://groups.google.com/forum/#!forum/xsi_list
<https://groups.google.com/forum/#%21forum/xsi_list>
<[email protected]
<mailto:[email protected]>>
*Subject:* Re: houdini question (and where to ask)
You can't get the "get maximum in set" when inside a vop.
But, you get those options with the promote attribute sop.
On Monday, March 6, 2017, Oscar Juarez <[email protected]
<mailto:[email protected]>> wrote:
I would like to be proven wrong, but that would be the way, I
mean in your second pointvop you don't need to add another
noise, your noise is already saved in an attribute, when you
promote just check off delete original and you can access the
same noise. Also noises have specific output ranges, they come
in the documentation, so you can always add a fit node to
change your range to what you need, in the geometry
spreadsheet you can also sort by value so you can see max and
min.
If you press X with your mouse over the noise output it will
add a visualization node, you can visualize on the viewport or
in the geometry spreadsheet the values. I know its not the
same but as far as I know their is no way to do the same as
the get maximum in set node in a vopsop context.
On Mon, Mar 6, 2017 at 3:57 PM, Fabricio Chamon
<[email protected]> wrote:
thanks everyone. The ramp parameter kind of works but as
you say, is not that user friendly and does not show the
points below 0. (that's ok, but I wonder if it is possible
to write a custom widget in houdini)
anyway, the thing I could not get right just yet is that
sort of "get maximum in set" thing. Sorry for using ICE
language, I'm trying to be open minded here, so please
tell me if that`s not the correct mindset.
so on this graph:
Imagem inline 1
...how could I get the maximum value of the output noise
node and compare to a single point output of the same node?
From what I can tell, I'd have to:
1- create this pointvop node with a turbnoise, then store
the output noise into an attribute (via bindexport?)
2- up one level -> drop an attrib promote (detail), set to
maximum
3- drop another pointvop node with another noise node
inside (same parameters) and compare the result noise to
that found on the atrib promote node??
I'm 99% sure this is totally wrong...how would you go
about that single task specifically?
and finally, thanks for the suggestions on houdini forums
and discord. will try both (although I pretty much like
this list =) )
2017-03-06 15:17 GMT+01:00 gareth bell
<[email protected]>:
yeah - the lack of handles is frustrating
------------------------------------------------------------------------
*From:*[email protected]<[email protected]>
on behalf of Olivier Jeannel <[email protected]>
*Sent:* 06 March 2017 14:05:17
*To:* Official Softimage Users Mailing List.
https://groups.google.com/forum/#!forum/xsi_list
<https://groups.google.com/forum/#%21forum/xsi_list>
*Subject:* Re: houdini question (and where to ask)
yep but it has no handles
and try to make négative values, it takes them but
wont show on the curve as it has a 0,1 space.
Unless i'm wrong (which i'd love to be)
Le 6 mars 2017 14:36, "Olivier Jeannel"
<[email protected]> a écrit :
in vop, bind and bind export node will get an set
datas.
Ramp Parameters is sort of fcurve.
It's a bit weak in terms of curve manipulation,
but does the job.
It has 2 modes rgb (ramp) and spline.
If you use several ramps in the same vop, name
them with different name or they might not export.
Le 6 mars 2017 14:28, "Fabricio Chamon"
<[email protected]> a écrit :
..sorry, hit send too soon.
Question #1: are there any equivalents to ICE
"get ... in set"? or or do I have to iterate
and store values for later comparision? In
other words: what is the best or recommended
workflow to compare single point data with
global point data?
Question #2: any nodes that resemble a fCurve
node, like we have in ICE? if not, what is the
alternative?
and finally, I can see this list is becoming
more and more houdini-esque than ever..but,
what is the best place to ask beginner
questions like the above? houdini foruns,
houdini list, odForce...
thanks!
2017-03-06 14:23 GMT+01:00 Fabricio Chamon
<[email protected]>:
Hi, I'm slowly getting into houdini and
this is my first attempt to port a really
simple ridged fractal deformer made in ICE
to houdini (using pointvop).
Question #1: are there any equivalents to
ICE "get ... in set"? or or do I have to
iterate and store values for later
comparision? In other words: what is the
best or recommended workflow to compare
single point data with
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