How to create a 3d coordinate gradient from groups of starting points? Kinda like a noise.

[Latimerias]

Ill try to explain this my best, i have a point cloud with a group of points that are like patches on the pointcloud (the white points below). I want to start a gradient kind of like an infection outwards from these groups to end up creating a noise type look. Ideally in the end the white patches would have a float value of like 1 and the red points would have a float value of 0 with a gradient at their edge which would have a controllable length. Using a sort of infection type solver or pcfind functions has been very slow because i am starting from these point patches and i need it to be fairly fast and iterable. I was thinking some sort of world coordinate based system like a noise would work well for this since you dont do any point searching which would allow for easy gradients but i dont know how i can initiate it from these start patches. Thankyou!  

[Librarian]

@Latimerias maybe it Helps
 

Gradient Growth.hiplc

[Latimerias]

Thankyou, but im looking for something not recursive and ideally not point calculation based. It seems junichiros method uses nearpoints and since im operating on a pointcloud i would have to use pcfind which is very slow.

[Librarian]

@Latimerias Hm maybe this!  Its fast
 

Fus.hiplc

[Librarian]

@Latimerias or you can use solver on rest Near points with noise..

 

[Latimerias]

That Fus.hip works very fast it is certainly an option i will look at. However i am still wondering if there is a way to use world coordinates with noise or something to get very smooth gradient like on the pighead below. I can then use the gradient to manipulate tons of values and it visualizes well and does not use a solver/recursion. If i were to do it with the iteration based method using pcfind yours is certainly faster but then for each iteration i would need to divide each expansion iteration by the iteration number  to get a gradient and apply some randomness which kills a lot of the art direction you get with noise and ramps.

 

 

 

 

ramps like here

Edited February 2, 2022 by Latimerias

[Librarian]

MM @Latimerias something like growthFallow with weights on any directions  ---I have those ...just Please search on gitHUb ..some Nice Dudes from Asia posted those otl's.Have Fun..searrch same name .
 

[Yader]

Look into the Distance from Geometry SOP, that should give you the growing pattern your looking for.

[vinyvince]

Never use it yet for that, but there is also the new pyro spread SOP

 

 

 

________________________________________________________________

Vincent Thomas   (VFX and Art since 1998)
Senior Env and Lighting  artist & Houdini generalist & Creative Concepts
 http://fr.linkedin.com/in/vincentthomas