18 replies to this topic

[cw85353741]

HI,gays!This effect in Green Lantern,How can make this light effect in houdini , I use particle for this effect ,but my effect was less filiform and details.Who can help me to fix this problem!Thank you








This is my work

Edited by cw85353741, 25 April 2012 - 10:58 AM.

[cw85353741]

sorry,pic upload
 Green Lantern.bmp   3.52MB   458 downloads
this is reference
 (lighteffect3.mov)00.00.01.486.bmp   1.7MB   310 downloads
this is my

[pclaes]

Looks like you could do that fairly easily with a few stretched out (scaled) fluid sims.

[cw85353741]

Hi pclaes,can you tell me more flow about ueing fluid sims!Thank you!

[pclaes]

Go to the shelf called Pyro FX, click on the billowy smoke tool, create a container. - It will drop down some nodes. run the sim, scale up the obj in the y direction by 10. It needs 100 frames or so of preroll. Play with the source and, buoyancy and source temperature scale to get desired taste. See scene file.

Attached Files

•  fluidstream_v001.hip   663.41K   173 downloads

[tallen]

oh hey...

I was there at Imageworks doing dev on Green Lantern at Sony. The green energy was made three different ways: The light beam was created using a shader, although early tests were created via a myriad of techniques. One of them using volumetric splines common to both Sony (Svea) and DD (Storm). (That's something I'd like to see Sesi begin to embrace. It's been years overdue)

The green energy balls fx (surrounding hal) were created predominately with particles and sprites (and instancing) - quite ram intensive (the still you provided had a ton of motion blur in there)

And finally, Hal's fast and slow energy was done with geo tricks using facing (camera) ratio fade method. (Think 'trail sop' with 'connect as mesh' option, then 'alpha para' & 'alpha perp' in shading)
Fun thing about Green Lantern is that much of the fx can be done with houdini (because most of it was!)


But anyone who went to DD or Sony (or R&H) knows about volumetric splining. We could use that in the Sesi repertoire.

[cw85353741]

thank you very much!

by the way!happy International Workers' Day!!

[dyei nightmare]

no but that light beam  is not the most interesting thing in the movie...

but this effect is:

Edited by dyei nightmare, 28 April 2012 - 06:32 AM.

[Marc]

tallen, on 26 April 2012 - 07:09 PM, said:

But anyone who went to DD or Sony (or R&H) knows about volumetric splining. We could use that in the Sesi repertoire.

Yes we could... that would be awesome.

[eetu]

Tell us more

Is it "just" a spline curve, rasterized to a voxel grid, or something more ..interesting?

Edited by eetu, 02 May 2012 - 03:11 AM.

[sly]

eetu, on 02 May 2012 - 02:42 AM, said:

Tell us more

Is it "just" a spline curve, rasterized to a voxel grid, or something more ..interesting?

yep ,would like to know too

[pclaes]

I don't know the internal details of the way storm works as I have never used it, but as far as I understood it was a rendertime procedural that deforms and samples curves based on noise patterns, I'm not sure any voxelization is happening at all. It seems more similar to that technique where you create a volume through "motion blur". Also the strength of this lies in using curves rather than points so you can interpolate both over time as well as over the parametric coordinates of the curve.

I always thought the results looked similar to the "noise puff" you could get with a power noise on a fog sphere. Also, I don't think that technique is really fluid driven. Much closer to advected particles that then have those curve balls applied to them for rendering (still creating tons of extra detail) - I think I saw this in a making of for The day after tomorrow in that tornado sequence by dd.

Please elaborate more on how it actually works as I'm curious as well and there are most likely some incorrect assumptions in the way I think it works.