Getting value(s) from previous loop in for-each

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jttarigan: Member; 18 posts; Joined: Jan. 2020; Offline

Oct. 6, 2021 3:27 a.m.

Greetings,

I'm trying to build a procedurally generated randomly distributed stack of boxes using for loop (like a pyramid, but ununiform). My solution is in each loop, I generated a grid, randomly blast a few primitives (using group range) and extrude them. Now in my stack, the box in the next level must on top of another box in the lower level. So in the current loop, I have to be able to access the blasted grid from the previous iteration, and randomly blast from those grid. This is done repeatedly until I reached the desired level.

In programming, this should be simply by defining a variable to store the value to be used in the next iteration. Is there a way to do this in Houdini's for-each node?

Thank you

edit: added a WIP image

Edited by jttarigan - Oct. 6, 2021 03:34:50

Attachments:
for-loop.PNG (2.8 MB)


sekow: Member; 238 posts; Joined: Nov. 2013; Offline

Oct. 6, 2021 1:15 p.m.

you can switch the foreach_begin1_metadata1 node to feedback and fetch the last iteration/

http://www.sekowfx.com [www.sekowfx.com]


jttarigan: Member; 18 posts; Joined: Jan. 2020; Offline

Oct. 6, 2021 11:55 p.m.

thanks for the answer. It's the switch but I put it on "Merge each iteration". Basically I just randomly blast iteratively to the top grid and it will merge the iteration process.


eikonoklastes: Member; 331 posts; Joined: April 2018; Online

Oct. 7, 2021 6:36 a.m.

Can you share a sketch of what your desired output is supposed to look like?


jttarigan: Member; 18 posts; Joined: Jan. 2020; Offline

Oct. 7, 2021 1:54 p.m.

I want to make a house using stack of boxes as the image below.

Attachments:
house_box.PNG (1.8 MB)


sekow: Member; 238 posts; Joined: Nov. 2013; Offline

Oct. 8, 2021 3:17 a.m.

no need to blast the face out.
You could do something like this in the transform Y pos param:
bbox('../fetch_feedback_meta',D_YMAX)
see attached hipfile

Attachments:
stack_boxes.hip (146.0 KB)

http://www.sekowfx.com [www.sekowfx.com]


eikonoklastes: Member; 331 posts; Joined: April 2018; Online

Oct. 10, 2021 1:21 a.m.

I'm not sure if this is the result you're after

Edited by eikonoklastes - Oct. 10, 2021 01:24:43

Attachments:
For Each Stacking.hiplc (114.3 KB)

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