Volumes 101: Adding Forces To Our Solver
Added 2017-11-08 11:14:14 +0000 UTCAdding forces into our solver helps us to create more intricate detail while being able to direct our growth according to the values of a vector field.
Comments
Thanks for this video
André Gama
2018-10-27 21:18:56 +0000 UTC<a href="https://www.instagram.com/p/Bpc4dmbhiFo/?utm_source=ig_web_copy_link" rel="nofollow noopener" target="_blank">https://www.instagram.com/p/Bpc4dmbhiFo/?utm_source=ig_web_copy_link</a>
André Gama
2018-10-27 21:18:29 +0000 UTCHeyhey, a few things I noticed / that come to mind: - Which cloth solver? (Dial up the substeps in the SOP-Solver.) - Make sure your control splines are roughly positioned where your sim is happening - Make sure your velocity volume is big enough to contain your control splines - Make sure your velocity volume is roughly centered on the control splines (or vice versa) Cheers, Mo
Entagma
2018-05-07 09:35:48 +0000 UTCThank you Mo, I tried the sophisticated way - I dont have the cloth solver to increase the solver substeps -, and even when I play with the multiplier it does not change dramattically. In any case I also played with the blend ratio to decrease the expansion and increase the extrusion along the curve more so its less spherical and more according to the curves I put but that also did not work. I am attaching the file and the curves I used. <a href="https://we.tl/zTmhEaRird" rel="nofollow noopener" target="_blank">https://we.tl/zTmhEaRird</a>
Levent Ozruh
2018-05-07 08:35:55 +0000 UTCBrutal way: Increase solver substeps. More sophisticated way: - In the volume wrangle creating the vel-volume, change the last line to: v@vel = dir * 10; - In the volume VOP inside the solver deactivate the normalize1-VOP Now you can use the multiplier in thevolume wrangle to drive the strength ouf your vector field. Have fun :) Mo
Entagma
2018-05-06 18:14:32 +0000 UTCThanks a lot Mo, is there a way to increase the growth speed? I tried to multiply the blend in volume vop but does not work.
Levent Ozruh
2018-05-06 16:56:27 +0000 UTCHi Levente, well there are a few general things I could think of: make sure your vectors point in the right direction and blend (mix) them with the gradient in order to have the SDF constantly expanding. This to me seems like the most important points. And then it's finding the right sim parameters. Which is a whole different story... :) <a href="https://www.dropbox.com/s/kb00fphjzfr4z71/Curvature_05.hipnc?dl=1" rel="nofollow noopener" target="_blank">https://www.dropbox.com/s/kb00fphjzfr4z71/Curvature_05.hipnc?dl=1</a> Cheers, Mo
Entagma
2018-05-06 15:23:11 +0000 UTCHi There, I am trying to use custom forces such as your Art Directing Velocity Volumes. I have manually drawn curves and use them as the the driving force for the growth. So kind of merging this file with the Art Directing Velocity but when I use replace the Volume VOP of one with the other the geometry just shrinks. I was wondering if you have any idea on that.. Thank you!
Levent Ozruh
2018-05-06 13:33:56 +0000 UTCHeyhey Daniele! Force of habit I guess - indeed you could omit this step here but I tend to normalize nevertheless just to make sure my incoming vectors are unit length. Had some bad debugging to do one time when I forgot to do so and the vectors were in fact not normalized :)
Entagma
2018-01-31 19:21:19 +0000 UTCHello, thank you for this wonderful volume series. I just would like to understand: why do you normalize the gradient here? Isn't already the gradient a normalized vector by definition? Thank you!
Daniele Frontini
2018-01-31 18:01:53 +0000 UTCHi Ben and thanks for asking - you were right. It is just personal style. In recent weeks I switched to calculating curl directly in VOPs / Wrangles, yet when I recorded the tut I was still using velocity volumes for curl. Which in this case admittedly is neither fast nor particularly clever :) Cheers, Mo
Entagma
2017-11-08 16:35:12 +0000 UTCHello! Love the course so far. I'm curious though, was there a particular reason for implementing the curl noise in a separate vdb? After the previous lesson, I played around with adding a curl noise node inside the Volume VOP within the solver (multiplying by both the vol. gradient and curvature) for some interesting results. I completely understand if it's just a personal preference as well. Thanks!
Ben Carmeli
2017-11-08 15:22:16 +0000 UTC
