Hello back, thank you very much for the information. This confirms my suspicion. I have finally decided against the A4000. Best regards

Dear Forum,
unfortunately, I need to quickly decide between two options. In terms of public benchmark results, the RTX 4080 performs significantly better than the A4000. However, these tests are mostly from the gaming sector. Which graphics card is better for using Houdini: NVIDIA RTX A4000 or NVIDIA GeForce RTX 4080?

It would be nice if someone could give me some advice.

Greetings
Gerd

I think it really was a UI bug. I installed the latest build and the problem semms to be solved!

Greetings

Gerd

Hallo, I want to write a scritpt inside a “new digital asset”.
But I cant't chose “python module” in the event handler of the Scripts tab.
Does somebody know what I can do?

Here is a detailed description what I have done so far:


I do the following:
File -> New Asset

In the checkbox I choose
Definition: Python
Network Type: Geometry

In
TypeProperties->Scripts
I want to type my python scirpt. But The event Handler does not work. I cant't create a “python module”. I can choose nothing

Does somebody know what I can do?

Hallo,

does anybody know, if there is an equivalent to the dopfield (h-script expression) in vex-expression? It would be very helpful for grouping rules.

Greetings

Gerd

thank you for the quick reply, i will test your solution
sorry, i was editing my question while you where answering … that was not very nice of me.

greetings gerd

Hallo,
I have a question about pops: How to detect the change of an attribute value.

Is there any expression that solves this problem?
If not, I have to ask another question:

Is it possible to get an attribute value of a specific elapset timestep? For my problem I' m mostly interestet in the previous timestep.


would be nice if anybody knows a solution!

Greetings
Gerd

Hallo Rowe,
thank you for your quick answer. Anyhow isn't your approach working If I try.
Some particles always stay in the air without moving after they have bounced once.
Another thing: If you delete the popcolor node, and turn on color hits again, than all particles that have collided should turn red by defauld. But what really happens is that most particles don' t change color (so they stay white) and only some turn to red. the white particles are bouncing and falling down and the red particles “stay in the air” aufter they have bounced one time. that means they are just hanging in the air without moving. .. very strange! And no matter which Attribute I use for grouping: the one that' s created by “color hits” or “hitnum”

I have modified my example. It has now a switcher, to show the different approaches.

Greetings

Gerd

Hallo,
I have attatched an hipnc file that illustrates my problem.
I try to get control over the bounce of particles in a special way. in old pops it worked well but I can' t duplicate the effect in the new pops.


I don' t no if i' m right but I think the reason for the problem could be the following:

In the old pops i sometimes used the local variable $JUSTHIT. this variables is 1 if a particle has just collided. this variable is cleared (getting 0) at the beginning of each timestep.

i used this variable to group (preserve group unchecked) particles, that have JUST collided. After the next timestep they shouldn't be inside the group anymore.

in the new pops you can only use vex expressions for defining a gouping rule.
i hoped that the colorhits option will replace the justhit variable.
You find this colorhits option inside a popcollisiondedtect -> Behaviour -> Color Hits. If it is turned on, particles that have just collided will have turned their Cd attribute to specivic value like 1,0,0

It seems to me that the particles will keep this value after collission. and that seems to be the problem.

is there a way, that they loose the value in the next timestep? Or am I completely wrong with my troubleshooting?


… I hope somebody can help me

Greetings
Gerd

O.K.
thank you!!! Doesn´t look too diffult!

Greetings
Gerd

Hallo,

just found out that there are nodes like add point, vertex or primitive in the VOP context.
It sounds to me as if you could create geometry out of vop.

So, is it possible to create geometry with the Add primitive vop? And if yes could anybody give me an exsample how it works? I played a bit around but it didn´t work

greetings

gerd

O.K. thank you for the answer!
So it' s a bit more complicated. I suspected that

And no: I didn' t know about extra image planes. So will take a look at that. It might be usefull!


Greetings

Gerd

My question is a bit difficult to explain.

At first a I try to discribe what I think happens if you render out a scene:

Step one:
You can define basic diffuse colors and you can create shaders to have even more complex color structures.

Step two:
If you render out a scene the renderer takes into acount all the information I mentioned above. And it will take into acount the lights. Objects appear more or less bright depending of thir position relative to the lightsource.


AND NOW MY QUESTION:

Is it possible tho get the color information that is calculated in “Step two”? I mean is it possible to get the numerical value of the (point-) colors that will be rendered out?

Don' t get me wrong: I don' mean the color information of the
2 dimensionaI pixel grafic. I mean the color information that refers to the tree-dimensional scene.


Would be nice if someone could help!

Greetings gerd

Cool - thank you. It works now!
That was the problem. Very general I think … good to know!!!

Greetings Gerd!

Hi folks,

I try to get the name of point Attributes via Python.
I tried it with the “name” Method of the “hou.Attrib” class.

The Problem: I don´t only the name, I get some extra information, I don´t want to have.

For Example: I want the name ‘P’ and I get this:
<bound method Attrib.name of <hou.Attrib Point ‘P’ (3 Floats) of geometry in /obj/geo1/blabla_1>>

Do somebody know what to do? Would be nice!


Greetings Gerd

________________________

PS:
Code looks like this:


node = hou.node('/obj/geo1/blabla_1')

for attrib in node.geometry().pointAttribs():
print(attrib.name) #with a tab before the print() of course

Good evenig,
can anyone tell me, if the houdini indie license is an anual one - just like the “houdini engine indie” ???

:?: :?: :?:

greetings
gerd

Thinking about a “low” budget workstation solution.
Has anyone experiences or at least an opinions to
the Xeon E3-1230v2.
Is it enough for non professional use?

Would be so useful if anybody could help me, because I´m no hardware expert at all!

Greetings
Gerd




—————————————————————
Processor Number E3-1230V2
# of Cores 4
# of Threads 8
Clock Speed 3.3 GHz
Max Turbo Frequency 3.7 GHz
Intel® Smart Cache 8 MB
Max Memory Size (dependent on memory type) 32 GB

http://jonaspfeil.de/ballcamera [jonaspfeil.de]

i don´t know, if you can really use this cam, but at least it´s a funny invetnion!

i want to make three recommendations for good materials dealing with mathematics.
target group are people that had math only school and did not study it at university.

why “in german”?
i don´t want to exclude anybody. i think that it´s not a big problem to get real good material in english. but if your´re form a country with an unpopular language like german you have to searge a bit more. so all the sources are at least in german and english.

real good if you left “school days” years behind you:
http://www.math.tu-berlin.de/OMB [math.tu-berlin.de]
it´s from the technical university in berlin (tu berlin). students take this corse before they start studying.
language: german and english.


G. Farin:
german: “Lineare Algebra: Ein geometrischer Zugang”
same in english: G. Farin: The Geometry Toolbox for Graphics and Modeling
this is really nice book if you want to learn something about matrixes. very easy explained! more adaptive than scientific!!!

i hope that it´s helping someone!
and might be that you can add other usefull (and not too scientivic) sources. what i´m still looking for is something about quaternions for rotations in cg.

greetings!

O.K. thank you. I just recovered my vista (yes: I recovered vista! please, no comments abour that). that was the reason why my drivers are so old.

so : now its working!