PDA

View Full Version : WIP: FX sequences


ADamiani
04-01-2008, 10:46 PM
My name is Anthony Damiani. I'm an aspiring technical artist and a fourth-term student in the Guildhall at SMU program for game creation. As part of a directed focus studies program, I've decided to get some experience creating VFX with particle systems in Max. This has been going on for two weeks (plus another two weeks of research), and will continue throughout the month of April. I'd like to post my work on this project here, for constructive criticism and suggestions on improvement.

Because this is my first foray in the field (myfirst.vfx, as it were), and because I'm attacking problems that have largely been solved already, most of my peices have started out from tutorials. As I do hope to gain a solid understanding of the techniques, I'm hoping to expand and customize them.

The first one I've done is a tornado, based on Pete Draper's "Assisted Twister" http://www.computerarts.co.uk/tutorials/premium_content/3d__and__animation/assisted_twister

The original version of the background photo is by Matthew Hull, and used under a Morguefiles license ( http://www.morguefile.com/archive/?display=98566 )

I have ajdusted the background in Photoshop, tweaked the twister materials, and added a wave effect, to make the tornado less static. I suspect it could still use some work-- I'm thinking about scaling the radius of the funnel and vortex, and perhaps toning down the wave.

Tornado:

http://www.youtube.com/watch?v=84FE3LPHaKI

http://www.mediafire.com/imgbnc.php/7a6abca8012f42b5718d8388599117ca2g.jpg (http://www.mediafire.com/imageview.php?quickkey=yjvw0jjj1dm&thumb=4)

My second effort was a modification of Arxwyn's 3d Studio Max Rain Tutorial http://www.tutorialized.com/view/tutorial/Rain-Tutorial-for-3D-Studio-Max-PFlow/22408

Using a cleaned up version of a background photo produced by the National Oceanic and Atmospheric Administration (and thus in the public domain : http://www.photolib.noaa.gov/htmls/wea02159.htm)

I added variability, motion blur and depth effects to the rain. Arxwyn's tutorial didn't specify materials, so most of my work went into getting those right-- a more experienced artist would have done proper ripple animations baked onto a texture. I settled for low opacity medium-spec images on the rain and the impact droplets. I was disappointed because I wanted both the spec and a very light subtractive transparency on the droplets themselves, but the two effects appear to be incompatible. The small puddles use a particle age map for their specularity levels, with the starting state being white, end state being black, and the mid-state being a greyscale radial gradiant ramp that looks similar to a ripple impact.

Rain:

http://www.youtube.com/watch?v=1PuAJggkDAY


http://www.mediafire.com/imgbnc.php/1455deb7ec4e1910ccc2b70a173b83852g.jpg (http://www.mediafire.com/imageview.php?quickkey=crao9akzzlj&thumb=4)


For my snow scene, I started from rpadc2002's "Making a Winter Scene" tutorial: http://www.enjoycg.com/forums/enjoycg-tutorials/2764-making-winter-scene-tutorial.html -- that said, it was hardly necessary. I was intimidated at first because it uses the non-pflow particle setups, but the blizzard primative really does just what it says, so it was mostly a non-issue. I added some post process effects (depth of field), but there wasn't a lot to add in a technical sense. That meant I was free to do a little expressive art here, playing with adding secondary emitters and space warps, to give it more of a "snowstorm" effect rather than a mere snowfall.

The base image is a modified version of "White Shit" by Uncle Ariel, released under an attribution license: http://www.flickr.com/photos/afgeneral/390892712/sizes/o/

Snow:

http://www.youtube.com/watch?v=Uz6iiwvug6U


http://www.mediafire.com/imgbnc.php/067bba78bd3a76886de85ee74adb37532g.jpg (http://www.mediafire.com/imageview.php?quickkey=eyzmzwztt2i&thumb=4)

For the Lightning I referred to Arxwn's tutorial on the subject as a starting place.
http://www.phoenixbit.com/site/tutorials.asp?view=R3JhcGhpY3MvM0QgU3R1ZGlvIE1heC9zdG9ybQ I then rejiggered all the parameters and tossed it into video post. While the basic approach seems solid, the big flaw with what Arxwn was doing is that the lightning bolts remained the same size at all points-- where real lightning appears to have a thicker trunk and tapering branches. I suspect an actually elegant solution to this issue requires slightly more scripting than I now posess; however, I was able to obtain satisfactory results by applying a scale operator in the main part of the pflow loop, such that each particle grew to 105% in each pass. This creates a "growing" bolt as a side-effect, but I'm not displeased with that.
What I *am* displeased with is that this approach is highly difficult to scale for larger sizes. Because each particle is spherical, if I scale it much larger than it is at present, the particle shape becomes evident. Thus, some relatively hair-thin lightning:



Lightning:

http://www.youtube.com/watch?v=jwtO9cvH77o


http://www.mediafire.com/imgbnc.php/28cc7a8b2904e7f7a432b2882046749f2g.jpg (http://www.mediafire.com/imageview.php?quickkey=ym2wdzdjmmh&thumb=4)




Next: FIRE (part one).


[EDIT: Ripping out the mediafire links and replacing them with YouTube ones, now that the compression issues are resolved.]

ADamiani
04-14-2008, 09:18 PM
Having some trouble getting these videos to work-- when I upload the tornado to Youtube or another streaming source, it gets irredemably corrupted. So I've been using mediashare, which is a pain in the butt to view. So I'm uploading these to Youtube in the hopes that the results will be better.

I've done some fire here, inspired by Alan McKay's tutorials as well as Arxwn's-- and using Blur's electric texture plugin (but no volumetrics). Ultimately I had to rip everything out and rebuild it as a pFlow anyhow, which apparently I know how to do now...

http://www.youtube.com/watch?v=NzSxSSuYWig

I'm also working on a couple others-- still very much WiP.

The fire jet effect is very directly based on Allan McKay's meteor tutorial-- with substantial changes to the video post (emitting only over a threshold brightness). Unfortunately, I've lost the file for this one, so I've been postponing going back in and recreating it from an old version.

http://www.youtube.com/watch?v=CWDe-KbZthc

And this teapot explosion, well, that's getting to be mostly my own-- hence the suckage. I'll definitely be revising this one.

http://www.youtube.com/watch?v=F_Vlp69Iebo

Comments/critique and advice would be greatly appreciated-- even if it's just directions to a more appropriate forum....

ADamiani
04-22-2008, 09:33 PM
In the hopes of soliciting further feedback, I've moved on to energy and sigil style effects.

A slow energy beam (not quite sure how to accelerate these easily-- changing the timeframe seems to scale the pflow systems with it)

http://www.youtube.com/watch?v=lXIgb51gEYc

An outward-radiating energy blast with Kirby-dot style effects. I'm mostly happy with this one.

http://www.youtube.com/watch?v=3sQtUqaAa1A

A matrix-style sequence of glowing symbols falling and flowing across the surface of geometry. Note the shadow area where they drop off the side of the teapot-- trying to fix this with a low-magnitude spherical gravity force inside the geometry, but that seems to accelerate the speed of particle motion far too much to be usable.

http://www.youtube.com/v/cVN792qgWiE

A system of Enochian symbols spray out, spin through a vortex leaving trails behind them, and form a pentegram.

http://www.youtube.com/watch?v=-9QyydYaJaQ

CGTalk Moderation
04-22-2008, 09:33 PM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.