VDB advect growth

[archz2]

I'm trying to achieve an advect growth which should look like this. 

 

 

 

But it's looking like this. 

 

Please help in resolving. 

I'm following this tutorial. 

 

Here's my file. 

Houdini Session - VDB Advect Growth_forum.hip

 

 

 

Edited June 17, 2021 by archz2

[flcc]

In the volume Vop, I think your rampcurve is in the wrong place.
It should be after the bind curv, not the the bind grad.

[archz2]

5 hours ago, flcc said:

In the volume Vop, I think your rampcurve is in the wrong place.
It should be after the bind curv, not the the bind grad.

Thanks a lot! That fixed it!. The tutorial is explaining the steps but not explaining the reasons of the node connections being used in the volume vop. Can you please suggest some tutorials which explain exactly why the nodes are used in this particular sequence ?

[flcc]

Entagma has very good tutorials, both concise and with good explanations.
They have many free tutorials, but hey have a series on their patreon called volume 101 that I particularly recommend for what you're after.
Vdb analysis, grad, curv etc... are perfectly explained.
Not free but it's worth it.

Edited June 18, 2021 by flcc

[archz2]

On 6/18/2021 at 8:02 PM, flcc said:

Entagma has very good tutorials, both concise and with good explanations.
They have many free tutorials, but hey have a series on their patreon called volume 101 that I particularly recommend for what you're after.
Vdb analysis, grad, curv etc... are perfectly explained.
Not free but it's worth it.

Actually I have that course. I made one geometry also from that course in which you helped me a lot here. 

 

I reached till video number 12 and felt that although they briefly explained the principles of VDB, volumes and voxels, they don't state reasons of why they are doing a particular step in their workflow. The pace is also quite fast and I have to rewind multiple times in order to follow up the exact process they're doing.  I learnt the basics of Houdini from Rohan Dalvi's videos which he explains very well at an easy to follow pace. However I still haven't yet found a tutorial in which all the reasons for steps in designing volumes are also being explained. The best that I've found are TIMJ's ones. He mostly explains the logic behind all the steps that he does, but sometimes he misses. 

[flcc]

39 minutes ago, archz2 said:

The pace is also quite fast and I have to rewind multiple times in order to follow up the exact process they're doing.

Yes it's true, but that's exactly what I like. I hate tutorials that take an hour for the same thing.
In fact I think it's hard to find a tutorial that both goes in depth and covers all aspects of set-up construction simply because it would be too big, or too long.
The entagma tutorials focus on specific points, and assume that you have the required knowledge.
And indeed Rohan Dalvi is also a good source, which both goes deep, and remains accessible to the "beginner". But even though I'm far from being an expert they are too long for me. I'm not a patient guy haha.

Don't worry about it. It's true that learning houdini can be frustrating at times, but there is so much to learn.
With a bit of time, those parts that seem obscure to you will no longer be a problem.
And you can always ask here. As you can see Houdini has a great community

By the way, another great source is the Procedural Go Masterclass. This is the source of all the other tutorials. They are quite long and very detailed. The problem is that you often have to start from old version, so if you look at a masterclass on fluid flip for houdini 18 for example, there will be only the changes or the novelties that will be detailed.
So you will have to go back to H15, or H14 masterclass or... to find the starting point.

Edited June 23, 2021 by flcc

[archz2]

Thanks a lot for your support! Yes, initial 10-15 days were quite hard and difficult. Now it's becoming easier. 

 

1 hour ago, flcc said:

By the way, another great source is the Procedural Go Masterclass. This is the source of all the other tutorials.

 

Please share the link of their channel. I can't seem to find it. 

 

A quick google search gave me this...

 

 

[flcc]

Ah sorry,  this is a joke of the translator

it's Go procedural !

https://www.sidefx.com/tutorials/
Just enter masterclass in the search field.
or
https://vimeo.com/goprocedural

[vesaw55345]

I am having problems getting advect growth to work and I believe (at least in Houdini 19) in the above project the Curvature analysis does not work as expected, even after moving the rampcurve. It's hard to see since the noise drives the growth here. It's easier to see when following the Entagma tutorial where the advection is entirely driven by the curvature. According to the comments on YouTube a lot of people have the same problem with newer versions of Houdini but there's no answer on YouTube which is why I'm posting in this thread. Basically multiplying with the curvature doesn't do anything.. Any clues on why?

 

advection_recovered.hipnc