I get error when I try to createNode() I am using Indie version btw.

The attempted operation failed.
Traceback (most recent call last):
File “hou.session”, line 6, in <module>
File “CPROGRA~1/SIDEEF~1/HOUDIN~1.313/houdini/python2.7libs\houpythonportion.py”, line 541, in decorator
return func(*args, **kwargs)
File “CPROGRA~1/SIDEEF~1/HOUDIN~1.313/houdini/python2.7libs\hou.py”, line 5374, in createNode
return _hou.Node_createNode(*args, **kwargs)
OperationFailed: The attempted operation failed.
This node cannot contain other nodes

jeff
Some SOPs don't take local variables. Carve SOP is one of them. There is an existing RFE to have the Carve SOP take local variables.

In the meantime, if you need to process multiple curves, you will have to wrap the Carve SOP inside a ForEach SOP in order to process curves in turn.

These days the ForEach SOP is pretty efficient.

Yeah, I ended up using ForEach SOP. Thanks!

Hi,

How would I reference point number with global variable $PT in carve node?

It seems to not having the global variable.

Want to run an expression
point(“../vopsop23”, $PT, “growth”, 0)
on FirstU parameter of carve node.

Any suggestions?

Hi,

I've created a simple houdini asset that changes color of point attribute on an object.

I've imported it into Maya using Houdini Engine plugin but it does not seems to read the color from the HDA.

How would I make Maya to read the color values from Houdini Engine Asset ( or HDA )?

Any suggestions?

Hi,

I've tried couple different ways to import H13 geo with Cd attribute into Maya2014.

I used HDF5, promoted point Cd attribute into vertex Cd attribute.
In Alembic ROP node, in vertex attribute parameter, I put Cd.
In point attribute parameter, I put N.

It seems like it still does not load the Cd properly and give me an error:
// Error: file: CProgram Files/Autodesk/Maya2014/scripts/AETemplates/AEnewColor.mel line 42: Attribute facetted3:clean1.Cd is not vector-valued. //

Is there something that I have to do in Maya to get that color rendered?

Any kind of suggestion would be really appreciated.

Thank you!

I understand “coef_1 * val_1 OP coef_2 * val_2 OP coef_3 * val_3 OP constant” but for coefficient (for example coef_1 ..2 and so on)

There are drop down menus for Timestep , e^Timestep.

I see “set always” down there which will evaluate every frame with current value but what about the Timestep and e^Timestep? what does that do exactly?

What is exactly meaning of divergence free in solver?
I realized that it does not make advecting data not to be stucked in an area.
But how does it works?

How does pressure field generated and get working with gas project non-divergent node?

Thanks for the well explanations.

I understand the directionality of turbulence for the points.

Howeber, for volume, what would be main benefit with multiply normalized position data of voxel to turbulence and add to position to get distance and remap(fit) for getting edge smoother
and
just multiply turbulence with position data of voxel and get distance and remap(fit) for getting edge smoother?

I don't see much difference.

Let say if I want a sphere to have some natural shape, I fetch position data of point or voxel to turbulence vop and add that to my global position ,right?

I saw 1 example and he get the vectors which is shooting from center of the sphere to the current positions (basically shoot from inside to outside) and normalized the vector and multiplied to the turbulence value before adding the value to the global position.

I've heard that is to make give turbulence value only for the edges of the sphere but how that actually work out?

I am rendering a volume with a particle system(rendering as mantra points) and it give me flickering only when I render volume and particle together.

When I render only each element, it doesn't do the flickers.

Here goes the example video clip. (see the bottom part of the particle

I've tried matte volume but also gives me flicker, instancing simple geo instead of using mantra point for render also gives me flicker.

Used higher resolution for depth map shadow, but still gives me flickers.

What could cause this?

Hi, I am trying to make a point deformer and I am stucked in a step.

Here is my plans–

1.copy all the points that I want to deform to the polygon object so they are 1 object using hou.geo.createPoint in python.

2.get uv attributes from the object

3.copy the uv attributes of first frame so it will contain the static uv value while the object is deforming.

4.get position value from the uv and fetch the output position value to the points that I want to deform but it seems like from the uv, it's not getting the right position.

Can anybody take a look inside of this file and what step I am missing?


point copy to object python script

node = hou.pwd()
geo = node.geometry()
geo2 = node.inputs().geometry()
ptGrp = geo.createPointGroup(“ptGrp”)

for point in geo2.points():
pos = point.attribValue(“P”)

pt = geo.createPoint()

pt.setAttribValue(“P” , pos)

ptGrp.add(pt)


get position by uv and fetch to the original points script

node = hou.pwd()
geoPdef = hou.pwd().geometry()
geoAnim = node.inputs().geometry()

fPtGrp = geoAnim.findPointGroup(“ptGrp”)
ptsGrp = fPtGrp.points()
i = 0
for point in geoPdef.points():
pt = ptsGrp
ppos = pt.attribValue(“P”)
nprim = geoAnim.nearestPrim(ppos)
u = pt.attribValue(“uv”)
v = pt.attribValue(“uv”)
pos = nprim.positionAt(u)
point.setAttribValue(“P” , pos)
i += 1

Like This
Quote
MultiQuote
Edit

advecting fluid velocity in popvop.

is there an example?

Hi,

with python or any commands in textport or whatwever,
how would I select a group with selecting a point or prim in the group?

I have extremly high volume of points and all the points instacing box with 16 points.
I am rendering it with mantra but it goes easily over 16gb.

I am trying to use Delayed Load shader : Mantra , but reading the help file is not enough information for me to set this up.

Please let me know if somebody have done this or example file would be really appreciated.

Thank you,

I am trying to get this kind of glitch effect with original image that I have or original animation that I have.

http://www.triangulationblog.com/2012/02/lambeaux-by-nicolas-boillot.html#more [triangulationblog.com]

http://vimeo.com/3139412 [vimeo.com]

any ideas?

I have an fliptank with container.

I have created velocity with source volume node but it seems like it only works when it is birthing new particles.

I just want to use that as velocity source (not to emit more extra flip particles)

How would I set-up a velocity volume that affect only existing flip particles ?

HELP!

colormap in vop helped this issue!

point(“../attribcopy1”,$PT , “uv” , index)
Tried that earlier.
It came out like this..
which have wrong color space.

okay, how would I fix that?

cause I am trying to emit particle from that so the particle that emit from the point could grab the color.

Thanks!

Hi,

I have a geo which hav UV projected by Camera and I am trying to get the uv attribute to point Cd.
Used pic expression but it doesn't seem to work properly.


attached hip file avilable