Differential curve growth

[istomin]

On 05.08.2019 at 7:41 PM, Thomas Helzle said:

@jayhem & @btangonan: So I dug out this old file from 2016 and updated it to Houdini 17.5. 

Download it here: Coral_Growth_2019.hiplc

As was said in above post, the rendering wasn't Mantra but Thea Render.

Cheers,

Tom

how to limit simulation to geometry?

[dtcs]

Hey guys, I have been seeing all the posts on this topic. I'm trying to implement the same thing using an SOP solver using VEX. 

My approach is typical, I run a wrangle node over the points, where I calculate the average vector for each point to determine the position of the current point for the next iteration. After this wrangle node, I append a resample node which will resample the curve on each frame and this creates endless growth. 

So, instead of resampling on each frame, I would like to divide the curve when the distance between two consecutive points has reached some threshold value that I set before. I don't know how to make this division using vex. I have attached my file below. I just can't figure out how to add a point between those two consecutive points and change the point number in the right order.

Line_growth_01.hipnc

[crispr_boi]

I still don't understand how to create growth, that is limited to or mostly adheres to growing into two directions.

Like variant #8 and #9 in the video "a unified approach to grown structures" https://www.youtube.com/watch?v=9HI8FerKr6Q

Changing the frequencies and amplitudes of the volume noise, doesn't seem to achieve this result.

 

[Keshaw singh]

Looks awesome 

[papsphilip]

On 12/24/2018 at 1:29 PM, Farmfield said:

Don't know if I ever posted this one but this is a cool effect as well...

 

awesome!! i'm trying to do something similar, what method did you use?

[arane93]

On 12/24/2018 at 12:29 PM, Farmfield said:

Don't know if I ever posted this one but this is a cool effect as well...

 

Woww! I love it! I have tried this but I can't get circles to work on a 3D surface, how did you do it? 

 

Thanks in advance!!! 

[arane93]

2 minutes ago, arane93 said:

Woww! I love it! I have tried this but I can't get circles to work on a 3D surface, how did you do it? 

 

Thanks in advance!!! 

To be more specific, I would like to achieve that pattern that this coral has, instead of growing lines, they are circles. How can I achieve it?

[arane93]

6 minutes ago, arane93 said:

To be more specific, I would like to achieve that pattern that this coral has, instead of growing lines, they are circles. How can I achieve it?

 

I have tried to do this, I attach a hip file, but it doesn't seem like the best way, I'm sure it can be done better!

Coral_OF_v03_B.hiplc

[pk1234]

Hey guys, I've been taking a look at the famous video mentioned a few pages back:

While lots of techniques have been covered in this thread, I'm a bit lost when it comes to the later variations that "carve" into the surface. The variation 10 (area contraction) can be achieved using the same curvature based growth that's described in this thread (just go in opposite direction), but I can't seem to get the behavior of 12 (point contraction, starts at around 4:13) and 13 (line contraction).

Anyone have any ideas how those two effects 12 (point contraction), 13 (line contraction) could be achieved?