Volumes 101: Organic Cells
Added 2017-10-05 20:30:15 +0000 UTCIn this one we'll put the advection technique we've been exploring previously to use and create two setups - one forming another abstract head sculpture and the setup we used in the promotion for this course. Have fun :)
P.S.: For the final rendering you'll need to download the "Hamarikyu Bridge B" HDR from HDRLabs: http://www.hdrlabs.com/sibl/archive.html
Comments
I used a mask on the vdb analysis node. The mask is a volume in the shape of the head so the bubbles stay within the head and sort of fill it up as it grows. Here is the file: <a href="https://1drv.ms/u/s!AimpYVeO2MkbiKAOP2e7CDhfL26tBg" rel="nofollow noopener" target="_blank">https://1drv.ms/u/s!AimpYVeO2MkbiKAOP2e7CDhfL26tBg</a>
aravind kumar
2019-05-04 01:40:58 +0000 UTCHi! I'm trying to play with that technic and what I want to do is get variable speed of growth for individual "cell" and make them not only grow but also shrink. I was thinking about setting "speed" attribute to original points and somehow transfer it to VDB but cannot wrap my head around it. Please, help!
Az Ainamart
2018-12-12 10:37:18 +0000 UTCFYI the link to your HIP file isn't working at the moment. <a href="https://www.patreon.com/file?h=14720754&i=1454808">https://www.patreon.com/file?h=14720754&i=1454808</a>
Clinton Chang
2018-07-07 18:22:44 +0000 UTCMy instinct is to multiply the values of each voxel times -1 through a volume VOP or volume wrangle... but for some reason it is not working...
Bruno Canales
2018-06-28 01:51:02 +0000 UTCAwesome Tutorial Moritz! Thanks a lot. Question, how would you invert the head vdb so that the growth of the cells was limited by the inner boundary of the head instead of the outer boundary. In other words what if the growing cells existed inside rather than outside the vdb? thanks!
Bruno Canales
2018-06-28 01:34:05 +0000 UTCDone. Achievement unlocked: Tagtastic.
Entagma
2018-04-28 11:31:21 +0000 UTCthanks for your awesome courses ! would it be possible to add a categorie "Volume101" like "VEX101" and "AHTYA" ? it would be easier to reach previous courses. thanks !
AlexArdolen
2018-04-28 09:49:51 +0000 UTCHi Luigi, both of these can be tackled by introducing a scalar control volume, which we'll use to store a value that drives the strength of our advection (let's call it "amp"). Thus we can slow down the advection by using smaller values for amp and we can control in which regions the advection will be stronger by storing different values for amp across the control volume. I've colored the respective nodes pink in this hip file: <a href="https://www.dropbox.com/s/dignr7cmew64upi/VDB_advection_006.hipnc?dl=1" rel="nofollow noopener" target="_blank">https://www.dropbox.com/s/dignr7cmew64upi/VDB_advection_006.hipnc?dl=1</a> Cheers, Mo :)
Entagma
2018-03-19 09:21:02 +0000 UTCHi Moritz, really useful tutorial, well explained especially for a beginner like me. I've got a couple of newbie question that regard this video. 1st: Is it possible to offset in time the growth of the bubbles, for example from left to right of a grid. 2nd: Is it possible to modulate the amount of advection given in each frame to slow down or speed up the growth. I know that probably these are questions with an easy answer but I just need an hint to begin researching on my own.
Luigi Dalla Riva
2018-03-16 18:54:27 +0000 UTCHi, love these tutorials! How might you attack allowing the VDB "bubbles" or "cells" to combine into one cell after a certain threshold, maybe similar to how a soap bubble might combine with another? Curious if you have a suggestion! :)
Hunter Williams
2018-01-21 21:28:23 +0000 UTC@Olaf - That sound absolutely plausible... Let's check by increasing the smoothing and checking if that's gonna yield similar results. Thanks for the input!
Entagma
2017-10-19 19:36:30 +0000 UTCHi Florian, as far as I know this feature is currently only available in Mantra (but I hope I'm wrong here). When it comes to more intricate features, Mantra is a beast of an engine. I highly recommend checking it out for very challenging shots :)
Entagma
2017-10-19 19:35:25 +0000 UTCHi Moritz, one question, regarding rendering volume as Isosurface. Is that technic available in Redshift too? thanks a lot.
Florian
2017-10-19 13:45:38 +0000 UTCI think i know the answer to your question in the video. "Why is it smoother when lowering the resolution of the advecting VDB?" Your VDB smooth will now affect 8 times more actual volume space. And the lower resolution will not allow it to be as precise when smoothing.
Olaf Finkbeiner
2017-10-06 11:48:57 +0000 UTC
