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View Full Version : Boom! There goes my school...


rune
05-20-2002, 10:43 PM
I scanned an image of a building and tried to make an animation of it being blown up. This is purely a graphical test, an I hope noone are offended by it. If you aren't, I hope you'll have a look at the animation, because the attached image here doesn't really do it justice in my opinion.

http://runevision.com/3d/anims/ps_blowup.mpg

Please tell me what you think.


I made a new version which can be found in my animation gallery:

http://runevision.com/3d/anims/

When you comment, please make it clear if you comment on the old or the new version. :)


With regard to realism, how would you rate the animation?

What could I make better?


The explosion was made with POV-Ray, using a particle system I've programmed myself. Besides explosions, the particle system can be used to simulate many other things, but you can find out more about that on my website if you want.

Rune

rune
05-20-2002, 11:32 PM
Here's the scene without the photo mapped onto it. The geometry of the building is extremely simple, but it was very difficult to get the perspective of the scene to fit the perspective of the photo...

Stever
05-21-2002, 12:04 AM
Bad timing on your humour. Little things like these people take seriously.

ambassador
05-21-2002, 01:04 AM
nice composite,

I would not recomend showing that at school though

Jhonus
05-21-2002, 01:11 AM
is that supposed to be an image taken from a helicopter?

i can see how some people might interpret that as very bad taste.... so brace yourself ;)

Anemia
05-21-2002, 01:14 AM
Originally posted by ambassador
nice composite,

I would not recomend showing that at school though
True that.

Jos Metadi
05-21-2002, 02:49 AM
With the current state of things, I would would recommend wiping it off your hard drive and I mean REALLY wiping it off (7+ layers of overwriting, or whatever the current standard is). Trash the hard drive if you can afford another one.

Another hard drive is a small price to pay to not end up suspended, expelled and/or charged with a felony.

JoS

corinb18
05-21-2002, 04:17 AM
Nice (yet a little bit twisted) work Looks good. Pity that Americans are so sensitive.

rune
05-21-2002, 07:49 AM
I can understand why some would regard this animation as bad taste and I truely do take seriously the horrible thing that happened in America last year. I have felt with the Americans for their great loss.

But I don't think that should prevent people to ever again work on creating computer graphics with explosions in them. As for the image I used, I could have used any building, but I just happened to have a fitting one of this building. It really is nothing more than a graphical test.

Still, if anybody feel offended by what I posted, please let me know if I should cancel the message, because then I will do so.

Rune

Fuchmed
05-21-2002, 08:29 AM
one thing i noticed is that the flames after the explosion are way too fast. huge fires like this burn slower. looks like fast forward.
fix that and you have some realistic explosion!
looks good. :thumbsup:

Error323
05-21-2002, 09:24 AM
Very nice explosion!!! :buttrock: :buttrock: Great job! program your own particle system.. that's pretty hard ey!!!! :eek:

edaddy
05-21-2002, 03:34 PM
looks pretty good, i still suggest adding some blackness to the geometry that represents the school in the area of the explosion, cause you can see the school isn't damaged... but, overall good work! just that

rune
05-21-2002, 03:53 PM
This image shows the spheres for all the fire/smoke particles. The look of the fire and smoke is obtained simply by texturing those spheres with some procuderal textures, which I will show later. :)

Rune

rune
05-21-2002, 03:58 PM
Originally posted by Fuchmed
one thing i noticed is that the flames after the explosion are way too fast. huge fires like this burn slower. looks like fast forward.
fix that and you have some realistic explosion!
looks good. :thumbsup:

You're right! I should change that.

Thanks for the suggestion. :)

Rune

Joel Hooks
05-21-2002, 04:20 PM
I don't think it has much to do with recent events, it's just never a good idea to blow up schools. People take it the wrong way sometimes. i personally don't think it's offensive, and like you say, it was just a convenient image.

Anyhow, I would consider reworking your image tracking to look smoother, more like a camera - and maybe add a little zoom. Also, maybe consider painting an "after" image with char and soot.

Nice comp!

zworp
05-21-2002, 04:49 PM
if you are'nt allowed to make a anim where a school blows up, you should probably make all action movies/series ilegal (since people get killed/hurt in most of them).

and i can't understand why 11september is such a big thing, i mean only a few 1000 people died, when about 50 000children starve to death every day.



well, nice CG anyway.

rune
05-21-2002, 05:15 PM
Originally posted by HellRender
looks pretty good, i still suggest adding some blackness to the geometry that represents the school in the area of the explosion, cause you can see the school isn't damaged... but, overall good work! :bounce:
Yeah, I should do that... :)

I actually did add damage to the building (see the attached image), but probably not nearly enough, and it's mostly hidden by the fire and smoke.

Rune

Joel Hooks
05-21-2002, 05:33 PM
The damage would look good extended out onto the sidewalk I think.

You might consider blowing out some of the windows too from the internal pressure created by the blast.

Refracted
05-21-2002, 06:33 PM
i was looking at the animation, and there was something that didn't look quite right about the beginning of the explosion.. but i couldn't put my finger on it (it seemed too CG.. didn't quite fit in with the background)... then it dawned on me.. the fire isn't casting any light.. the dark corners are staying dark... a yellowish glow in that area could so a world of difference i think.. also, the thick billowing smoke would usually cast a shadow, and i cant seem to see one.. other than that, amazing animation, looks quite good..

Azure
05-21-2002, 06:52 PM
I agree with lowdown. That explosion in pretty big, and would cause alot more damage to that building, maybbe try to incorporate some damage into the building surounding the explosion. Great start though.:buttrock:

~A~

tuna
05-21-2002, 08:47 PM
good positioning / compositing...

though i think the smoke is way to fast and regular.. the main billow of smoke needs to spread out way more as it comes out into the air.. the drift of dust is excelent though.. perfect i'd say :)

try adjusting the contrast / gamma on the final render in some post compositing program (combustion) especially the flame.. makes it look so CG. (and it is the hardest part to do)


the initial flames, come out way too high.. i think you should use a diferant method of particles and textures to get the fire correct..

i think the damage done to the building looks great! maby animate some debris for longer... bricks rolling away.. (limbs?? :P )

:applause:

i like this

Pentagramma
05-21-2002, 09:59 PM
Hi there,

It looks great! :thumbsup:

But maybe you could make it more integrated. Try to slow down the smoke and flames, and add some camera shake when the explosion occurs (like if the camera operator was scared by it, or something).

You could also make the building not so centered at the frame , at first. It could add an "accidental" touch to it.

Anyway, congratulations!

sinistergfx
05-21-2002, 11:27 PM
A little suggestion:

Add add quick violent camera shake or two right when the explosion goes off like the camera man was surprised ("HOLY CRAP!")

EDIT: Whoops! I just realized this was already suggested above

Pretty good work on the explosion though

Jacko Cohen
05-21-2002, 11:31 PM
To all those people taking offense to this I have to ask:

What? Are you all morons? :surprised

People pay good money to watch buildings and planes blow up all the time. Did you all suddenly become offended by this after 9/11. I don't believe anyone who says movies showing explosions offend him.
What? You wouldn't watch Con-Air again if it showed on TV? I remember a Schwarzeneger movie where the entire Florida keys were NUKED! or even Christian Slater and Winona Ryder blowing up their school. It's natural and its funny. Everybody wants to do that at one point or another. :D

Jacko Cohen
05-21-2002, 11:40 PM
or like John Cleese once said:
"Oh, relax Mom. People explode everyday."

While the first part of that sentence is a bit macabre. The second part was as true 30 years ago as it is today. And although (or maybe because) these horrible things do happen - people shouldn't have to censor their ideas because some idiot might take offense.

Joel Hooks
05-22-2002, 12:22 AM
The question arises as to who exactly is the moron. Nobody expressed any offense, people mearly suggested he might rethink his theme as administration officials might frown on this sort of graphic depiction.

element412
05-22-2002, 01:02 AM
id suggest you to have so fire coming out form the fornt windows...

Jacko Cohen
05-22-2002, 01:48 AM
There's enough real horror in the world without minding somebody blowing up cg-schools. Everybody wants to blow up his school. If this is how the artist wants to vent his rage - more power to him. Its way better than the real thing.

I don't think the artist should censor himself just because some people think that other people might be influenced by this to go out and actually blow up a real school. That's just silly.

This image will not make anyone do anything.
Thinking that it might, seem to me a bit naive.
Telling him how to express himself and to change his theme -that's just wrong.

He's an artist. His job is NOT to be the guardian of pc.

beta
05-22-2002, 03:59 AM
zwarp: over 5,000 ppl died in the attack... 1,000 children where left with out parents. :eek:

Howard Day
05-22-2002, 05:13 AM
OK, first off, it's good to see you Rune! Long time! And something else -
Blowing up things is part of doing professional special effects. You've gotta learn how to do it. Admittedly, it was a poor choice to use a school, but it's still a valid animation.
The only advice I'd have is to make the fire and smole rise much slower. It looks like the film is going double time right now. Other than that, it rocks!

And guys - keep in mind that he's using Pov-Ray. It doesn't have ridgid body dynamics, unless you code them yourself. For what it is, and what program was used to make it, Dude - good job!

Agent D
05-22-2002, 05:58 AM
I was about to reply with some advice, but then I saw Howard Day's post. Yes, DEFINITELY slow down that smoke. The speed it is now destroys the realism of the movie by making it look like the fire is about 5 feet tall.

"Americans are too sensitive"?? Hmmm, I guess I don't pay enough attention to foreign people's (no offense intended) opinion of Americans... last I heard we were either lazy and shallow, or violent killers. ...MAKE UP YOUR MIND! :D

Don't worry too much about offending people. Just be carefull who you show it to. "Hey, there's the principal! Show him that cool animation you made!" ;)

rune
05-22-2002, 10:56 AM
Originally posted by Howard Day
[B]OK, first off, it's good to see you Rune! Long time! And something else -
Blowing up things is part of doing professional special effects. You've gotta learn how to do it. Admittedly, it was a poor choice to use a school, but it's still a valid animation.
The only advice I'd have is to make the fire and smoke rise much slower. It looks like the film is going double time right now. Other than that, it rocks!

Hi Howard, good to see you too! :)

As always, I'm doing the best I can with what POV-Ray has to offer... :D

As you and others suggested, I'll slow down the fire and smoke and make some other improvements too.

After this animation is finished, I'll probably have a try with some less realistic explosions, which frankly are more fun to do because there are fewer limits and more room for creativity. ;)

Rune

rune
05-22-2002, 11:00 AM
Originally posted by Refracted
(...) the fire isn't casting any light.. the dark corners are staying dark... a yellowish glow in that area could so a world of difference i think.. also, the thick billowing smoke would usually cast a shadow, and i cant seem to see one.. other than that, amazing animation, looks quite good..
Thanks! :D

I'll work on the yellowish glow. And you're right, there isn't any shadow - I'll add that too. The difficult thing about lights and shadows here is that the photo I use already is shaded and has shadows (being a photo ;) ). So to have shadows cast on the building and yet avoid double layers of shadows is a bit tricky... I think I've got it working though. :)

Rune

rune
05-22-2002, 11:03 AM
Originally posted by tuna
(...) try adjusting the contrast / gamma on the final render in some post compositing program (combustion) especially the flame.. makes it look so CG. (and it is the hardest part to do)
I'm not sure what kind of contrast/gamma adjusting it is that I need to do. Should there be more or less contrast, and should the gamma be higher or lower? Is the goal to make the bright parts be more bright and perhaps oversaturated?

the initial flames, come out way too high.. i think you should use a diferant method of particles and textures to get the fire correct..
I'm afraid that won't be very easy. I don't think I'll manage to make it more realistic. Actually, the most obvious choice would be to use volumetric patterns (is that what it's generally called? it's called media in POV-Ray.) rather then flat textures for the fire and smoke. However, using the media instead of textures would probably make the animation render about 20 times slower or much more, so I can't wait for that.

i think the damage done to the building looks great! maby animate some debris for longer... bricks rolling away.. (limbs?? :P )
I'll add more debris and they also roll a bit. I'll also extent the damage. :) No limbs though!

Rune

rune
05-22-2002, 11:05 AM
Originally posted by Pentagramma
Hi there,

It looks great! :thumbsup:

But maybe you could make it more integrated. Try to slow down the smoke and flames, and add some camera shake when the explosion occurs (like if the camera operator was scared by it, or something).

You could also make the building not so centered at the frame , at first. It could add an "accidental" touch to it.

Anyway, congratulations!

Thanks! :)

As you, sinistergfx and some others suggest, I'll make the camera shake when the explosion occurs. I think that will be a good effect... :D

Rune

Bionic Antboy
05-22-2002, 04:00 PM
i think it's looking really good so far. I'd agree with the comments regarding the speed of the fire and smoke, as they are moving way too fast for an explosion of that scale. Same with the lighting, but that should be easy enough.

The only other issue I can see is that the origin of the explosion is kind of indistinct. It seems as though the fireball should have more lateral/horizontal movement at the start if it's coming out of the building itself...right now it appears to be a fireball appearing in front of the building. The debris kind of conveys it, but not quite enough IMHO. If some of that debris could have smoke/fire trailing with it to accentuate this initial motion, it would give a better sense of blowing out, not just up.

The textures and motion look great, except for the speed issues. Overall very nice job. How about adding some sound in your next version? You should be able to find some free sounds of a helicopter and suitable explosion online. This would go a long way towards enhancing it.

As for the subject matter, I wouldn't sweat it. You have to blow something up, and a school is just as valid a subject. I didn't see people running out of the theatres in disgust when the Green Goblin attacked the building during the parade in Spider-Man.

Helix
05-22-2002, 05:23 PM
i didn't read the whole thread, but one way to improve it would be to make it blow OUT rather than from a point directly in front of the doors. maybe throw in some debris and blow out a couple other windows. it shouldn't be too hard and it'd look 100% cooler ;)

nice job. would it be in bad taste for me to model and then demolish the statue of liberty? :p
i had thought about it. news channels often simulate such things too. it's not out of hatred, but out of a need for drama and emotion. that's why they used it in the planet of the apes (original) and Deus Ex (pc game.. a good one.. and it happened to be accurate on a lot of future world events)

rune
05-25-2002, 10:03 PM
Thanks for all the suggestions for improvement! :D

Based on your suggestions I have made a new version of the animation. It can be seen in my animation gallery:

http://rsj.mobilixnet.dk/3d/anims/anims.html

( It's the one called "Blow-up" )

I made the animation much slower and added an orange glow and a shadow from the smoke, as well as some sound effects, though they're rather poor...

I tried to make a shaky camera effect after the explosion happens simulating a shocked camera man, but my attempts at that looked so fake that I decided to drop that... :sad:

Anyway, what do you think? ( I hope you think that it at least is an improvement. ;) )

Rune

Matt_Forcum
05-25-2002, 11:19 PM
the smoke starts up too fast. there should be more fire. and it should blow out more. and possibly bigger. other than that it is looking good.

about the subject matter. Your not blowing up a colombine school. or the World Trade Centers. Who cares. People need to realize that this is not a comment on any of those events. people are shot all of the time. yet we still make movies and television shows where people get shot. Because kenedy was assisinated, should we not make movies about assination ever again? because a building blew up, should we never show buildings blowing up again?

GRMac13
05-26-2002, 12:06 AM
People on this thread are saying "oh, someone may be offended by this because of 9/11 or Clolumbine." Well, noone has voiced being offended at ANYTHING so far. It's all in your minds this f*cking PC b/s is making you THINK someone will be offended by this. I'm from NY and when I looked at the anim all I saw was a building blowing up, I didnt for 1 second associate it to 9/11. In fact, I didnt even know it was a school until someone said it. Honestly, the thing that really got to me wasnt the animation, it was Jacko Cohen's "Everybody wants to blow up his school." Holy crap dude, that is f*ckin scary. What crowd are you hanging out with? I'll make sure I'm VERY nice to you guys. Maybe I'm missing something.

xynaria
05-26-2002, 12:28 AM
Never saw the first one.. just the remix and the only thing that really bothered me was that to an extent, and mainly on the darker smoke at the top as it rises, it shows a little too much the actual approach. i.e. the smoke doesn't appear to curl on itself or have any volition but to drift up and maybe because I knew the technique, the spheres still show slightly as that.

That being said it's a very impressive attempt and I do like the effect you have with the fire. Lookiing forward (as usual)to where you take this. :)

Postscript. Looking at it, I wouldn't have known it was a school and even if I was a teacher, governor, or pupil at that school I wouldn't have found it offensive in any way and would find it totally bonkers that anyone should.

Jhonus
05-26-2002, 03:02 AM
GRMac13: woah, keep it in perspective.

Teachers/parents are eager to find signs that a child could be the next one to flip out. Depicting your school blowing up could be considered a sign by a concerned over reactive conservative oldie.(I don't think anyone expects members of this board to care, they understand its a technical piece) So people were just putting a friendly reminder to watch out for that.

Any other comments about sept 11 are misguided and irrelevant.

This isn't really the place for a sideways discussion, its for crits on Rune's work. So cease. ;)

GRMac13
05-26-2002, 03:20 AM
Sideways discussion? Censorship is VERY relevant to CG as it is to any creative outlet. Sometimes it is neccessary (in cases where children may be exposed), but NOT in a case where someone is simply doing a personal excercise. I'm not the one who started this debate, I just dont like when people get all worried over something because "someone might get offended." Who cares? If your offended by it, you can choose not to see it. So why are people so up in arms? If someone is going to scrutinze Rune for this anim, then there must be some other signs that he may be a psychotic school bombing maniac, otherwise as I've said before it's just PC bullcrap gone amuck. I'm done.

merlin9876
05-26-2002, 03:35 AM
I can't believe people are talking about being "offended" by it. First off, if you don't want to "offend" other people, then just stay at home locked in your basement. Don't speak, don't do anything. There'll always be someone offended by almost anything you do. Second of all, I think that US people are just a bit too sensitive. Patriotism has it's limits (flag burning as a punishable offense? Come on, get a life!) and I say live for yourself and ones close to you, not under a flag. You're people with free spirit and judgement, not brainwashed zombies... I find it so paradoxal that the US has tons and tons of violent movies/tv shows/commercials and now there would be concern over an artistic experiment? Sometimes I want to resign my human being membership. Jeez...

Jhonus
05-26-2002, 03:36 AM
Sideways discussion?
Sideways, in the sense that this is a crit forum and the discussion deviates from that.

I'm done.
Same :D

GRMac13
05-26-2002, 05:37 AM
Merlin, stop bashing Americans, this isnt the place for it. I know that alot of people from other countries are jealous as hell about the quality of life that Americans enjoy, and now that we are faced with a tradgey, they are gloating about it, and wondering why it's a big deal that 5,000 people died (kind of sadistic, if you ask me). It seems to be satisfying for foreigners to take anything negative they can about the US and exploit it, but I digress... Americans are not the only people "offended" by things in this world (although we are probably the most vocal). Why is it OK for Americans to be sensitive to the rights of foreign nationals, but it's somehow wrong for us to be sensitive about our own? That said, I'm not at all abdicating censorship, because we all have the luxury of being able to see what we want to see. Let's end this debate now because it's gone too far off topic, but I'm really ticked off at how alot of people take any oportunity they can to bash Americans...THAT I'm offended by, especially in a forum that should be promoting unity and brotherhood among us artists, not discrimination and stereotypes.

Fuchmed
05-26-2002, 08:30 AM
hey Rune! This explosion now looks way better! It has improved ALOT. One thing that would make this shot perfect is ...err two things...

1.) i think the fire starts too fast. I'd say normally there's your huge explosion...everything is blasted out and a lot of dust. At this moment there i´s only litle fire. the fire then has to develop.

2.) the camera: there is the helicopter and a hobbyfilmer or whatever. he flys around, making some shots frome above, realizes the nice building... and when he is almost done filming this building *BOOM*! he trys to focus this point of explosion, but the cam shakes alot due to the following reasons:

2.1 -> he's excited/nervous (the "Holy Crap" thing already mentioned)
2.2 -> after a slight delay, the shockwave reaches the helicopter.

Thats definatly a lot of work, but i think it will pay.
regards Fuchmed:wavey:

hypercube
05-26-2002, 08:51 AM
Hey..second version is MUCH better, agree about the blast-then-fire though, there's usually a big gush and then flames..right now a little movie-like in that regard. But the motion of the flames and smoke looks way better I think..still maybe some oddness around the rooftop, but smoke is an odd/tricky thing to comp anyway.

Camera wise I think the move is looking a lot more natural in the beginning, doesn't feel like a 2D plate pan..I think a little more startle and snap-zoom might help, just keep it natural, too much waving around and it will feel like CG trying not to feel like CG.

Also what was mentioned about the shockwave reaching the chopper might be a bit overkill, it's not like it's a nuclear blast going off, I really think the heli would be 'safe' up there. BUT, what should reach the copter later would be the sound wave..you should see the blast and then the sound catches up.

Anyway, great stuff, especially since you're rolling your own particles and everything! Keep at it. :thumbsup:

dark_lotus
05-26-2002, 03:09 PM
political forum this is not, 3d forum this is.

Fuchmed
05-26-2002, 05:25 PM
haha...nuclear blast :)
no i meant with "reaches the helicopter" a noticable shakeing and not a shockwave that makes the pilot radio "MAYDAY".
You know... subtle but noticable camera movements.
I say that this huge bang definitly HAS an impact on the heli.

Flynn
05-26-2002, 06:28 PM
I dont find this animation offensive at all...
however
"and i can't understand why 11september is such a big thing, i mean only a few 1000 people died, when about 50 000children starve to death every day." I find this statement very offensive.

I agree that all the children starving in the world is horrible but steps are being taken by many states (incuding our own) to reduce this.

but the acts of sept 11 was murder to the likes we have not seen in a long time....how anybody can say "only a few 1000 people died"
is beyond me. They didnt just die...they were MURDURED....do you not know the difference? and there is nothing "only" about it

and if you want to reply to what I say tha is fine...but I will not answer back becouse I was offended enough by the statement to not return to this board again (or at least till I cool off)...

One of things I loved about this board is how it came together for the love of CG...but I get such a strong anti-american feeling from this thread that it makes me sick...I know that people tend to knock whoever/whatever is on top (microsoft anyone?) but just remember America gave you the light bulb, the car, incredible advances in medicine, the telephone, the computer, and yes the internet in which you use to bash us with... plus about a few million other advances that you take for granted every day. You want to bash our government ...hey thats fine and many americans would agree with you....but to bash us as people is pure hate and jealousy. You judge us based on what you think you know about us as a people.

Also remember that America is a melting pot...by "hating" us you hate the world.

sorry to get all emo on this....and I know this is not the place to discuss this at all....but I'm not the one that brought it up.

oh yeah america pioneered 3d grapics as well!!

so farewll (at least for now) keep kickin ass in the cg world...you are all very talented people whether I agree with your views of not.

-Flynn

Matt_Forcum
05-26-2002, 06:29 PM
Mayday? what is the copter going down now? i am not sure about that.

hypercube
05-26-2002, 06:51 PM
Hmm, maybe..I dunno, I'd just think that unless they were directly over it, really wouldn't be more than average wind turbulence up there..given the impression of the very opening shot's viewpoint, they gotta be a mile or so away..I still think it'd be the camera guy's nervousness doing it. If it was powerful enough to cause a wave up there, there would be way less building left, trees bending, etc. There was a boiler explosion on the news recently that I'm thinking of that's about the same size I think..it broke windows across the street, and KO'd a large part of the building it was in, but that was about it..set off car alarms..it's a big explosion but it would have to be humongous to get up there.

Anyway, just thoughts and observations..I should get back to the forest :)

The ACM
05-30-2002, 04:14 AM
I agree with the need to slow down the explosion. Also, there is no shadow from the billowing smoke and flame, and adding one would make it that much cooler. I think that the scene is far enough away that you dont need to show any more damage other than the explosion, as none would really be seen anyway. Keep up the good work. It looks good.

rune
05-31-2002, 09:51 AM
Originally posted by The ACM
I agree with the need to slow down the explosion. Also, there is no shadow from the billowing smoke and flame, and adding one would make it that much cooler.
Hi ACM, judging from your comments it sounds like you looked at the old version of the animation. The current version is the one you can find on this page:

http://rsj.mobilixnet.dk/3d/anims/anims.html

In the new version the explosion is slowed down a lot and the smoke has a shadow.

Anyway, thanks for your comments! :)

Rune

Jos Metadi
05-31-2002, 05:56 PM
I guess my comment near the beginning of the thread was misunderstood. It had nothing to do with causing or taking offense.

My concern is that I hear incidents all the time of kids being suspended and expelled from school for the most idiotic, ridiculous things imaginable. I don't want to see Rune get in trouble and have the rest of his educational years scarred by a bad reputation from over-reacting school administrators.

JoS

Jos Metadi
05-31-2002, 06:09 PM
Here's some thoughts on the actual animation.

The unsteady camera looks great. Give it a "real" feel to it.

The initial fireball should move quicker and be a little less yellow.

The smoke from the initial explosion should roil more. The center of the smoke should be going up fast, while the sides where the gases have cooled should be barely going up at all. See if you can find some video clips of other explosions to use as reference.

The later smoke should be going up more slowly and expanding a little more as it travels. This shape-> \/

The fire after the explosion should be smaller and closer to the building (unless it actually set a tank of fuel or something equally flammable on fire). Just the material of the building burning wouldn't continue to push a fireball out like that.

JoS

rune
06-15-2002, 11:31 PM
Ok, a bit late, but in case anybody cares, here's some information on how the individual particles in the animation were rendered. :hmm:

The renderer I use (POV-Ray) has support for volumetric effects which can easily create fire or smoke, but it renders very slowly. So instead I tried to map some very simple textures to spherical objects centered on each particle location.

I used a cylindrical pattern with a color map that changes over time. The cylindrical pattern is aligned so that the axis line goes through the camera location.

I then applied heavy turbulence to the pattern to give it the right look. When you see the individual particles they look quite bad, but it was a necessary compromise in order to make them render in an acceptable amount of time. They also look better when there's many of them.

The image below explain better than words how the particles were rendered. (Sorry for the large size, but I think it was necessary to show what I wanted to show, and I kept the file size down.)

In case you want to see the Blow-up animation again, here's the link again:
http://rsj.mobilixnet.dk/3d/anims/anims.html

Rune

ghengisjim
06-18-2002, 07:47 AM
I actually have some things to say about the original composition that took place, errr the video that was posted, but first I want to say something about this quote here...

Originally posted by zworp
if you are'nt allowed to make a anim where a school blows up, you should probably make all action movies/series ilegal (since people get killed/hurt in most of them).

and i can't understand why 11september is such a big thing, i mean only a few 1000 people died, when about 50 000children starve to death every day.



well, nice CG anyway.



I dont mean to be a complete ASS about things, but I am an American and in America we dont have people dying of starvation. September 11th was a direct and horrible attack on one of our greatest, and most symbolic cities that represents American culture. Sure, if you are from the Netherlands or China or whatever, maybe you should devote more of your efforts towards feeding the starving. How nice. How loving and caring. But as an American, obviously, we first and foremost are going to prioritize things like terrorist attacks that kill thousands in NYC and have a devastating effect on an already shaky economy.

As far as the video is concerned, I like it.. Although one thing I want to complain about is the way that the explosion opens up. If something was to explode on/near a building, you wouldnt see the entire sphere of the explosion, because the energy on the side of the explosion that is next to or near the building would be absorbed by the matter in the building itself. So what you would actually see is an explosion that seems to come out away from the side of the building. I would be interested in seeing the video in a more high res though. Maybe you could cut down the first few seconds of the video, because for Crit purposes I dont think they are nessacary as we are commenting on your explosion.

Oh, I just watched the updated video and I think the explosion looks 200% better. However, it still looks like a star wars kind of explosion; in space, nothing to confine it, it goes out equally in all directions...

Once again, i think it would behave differently coming from some building, or matter at all actually.

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