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Jet engine exhaust in Carrara
Posted: 27 December 2012 02:35 PM   [ Ignore ]
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Hello,

I’m currently working on a project where I am showing jets going down a taxi way. I am writing to ask if anyone might have any suggestions on how I might create the effect of the jet exhaust coming out the back of the engine.

The attached image was made in Photoshop. I was looking for a way to have an animated effect.

Should I be looking for a particle system or something done in post-production?

Thanks in advance.

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Jet_exhaust.jpg
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Posted: 27 December 2012 02:57 PM   [ Ignore ]   [ # 1 ]
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Seems like a fairly quick ‘n simple effect to get by using a kinda cone shaped object trailing behind the jet with an animated texture on it.

Make a cone, tweak its shape a bit to make it more like an exhaust than a cone, then apply an animated texture that does some blurring of the background and has some heat waves and moves in the direction of the blast.

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Posted: 27 December 2012 04:06 PM   [ Ignore ]   [ # 2 ]
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BTW, if you want to get fancy, you could apply a displacement map to the cone to give it some billowing jet exhaust blast type of animated shape. Cool.

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Posted: 27 December 2012 04:34 PM   [ Ignore ]   [ # 3 ]
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Oooo, even cooler….

Apply a Wave deformer to your exhaust cone object, and animate the phase over your animation. Give it a few cylindrical waves, and it will look awesome. Then maybe add some more deformers for interest (noise, whatever…).

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Posted: 27 December 2012 05:26 PM   [ Ignore ]   [ # 4 ]
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Here are 3 good example scenes to learn from, if you want to do this in Carrara:
http://www.ageofarmour.com/3d/free/carrara-particle-emitter-scenes.html

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Posted: 27 December 2012 06:40 PM   [ Ignore ]   [ # 5 ]
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A couple things to consider when choosing your method…

When you look at those cool photos/videos of F-14’s taking off from aircraft carriers at night, you can see that the exhaust is more of a pulsing plasma type effect, very hot and very powerful. Kind of a repeating, pulsing wave of hot plasma. Not that you can’t get something kinda like that with particles, but I think you might want something a bit different.

Also, one of the bigger challenges, IMO, is the shading. The effect you see is very much like heat waves rising off an asphalt road in the hot desert. Kind of a blurring of the background due to the hot air bending light.

So once you get the shape figured out, the key issue in believability will be the pulsing, blurring effect. In real life, that’s due to the transparency of the air being modified by the heat and the burnt fuel, which changes the IOR of the air. Or something like that….

So I’d spend a lot of time working with transparency/alpha/IOR to get it just right, so you get some blurring, but also you can see the pulsing plasma effect.

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Posted: 28 December 2012 12:50 PM   [ Ignore ]   [ # 6 ]
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Xeidos2 - 27 December 2012 02:35 PM

Hello,

I’m currently working on a project where I am showing jets going down a taxi way. I am writing to ask if anyone might have any suggestions on how I might create the effect of the jet exhaust coming out the back of the engine.

The attached image was made in Photoshop. I was looking for a way to have an animated effect.

Should I be looking for a particle system or something done in post-production?

Thanks in advance.

The heat plume from a jet engine is an enlongated cone.  The density of the heat distortion will vary with distance from the exhaust port.  I would suggest that you start with an almost transparent cone at the exhaust port and increase the Index of Refraction greatly.  Also, you’ll probably want to apply some distortion to the material to provide for the wavering of the light.  Follow the first cone with a second cone with a slightly less IOR but more distortion as the air particles will be less controlled by the force of the exhaust port.  Then add a 3rd following the same method as the second.

Kendall

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Posted: 28 December 2012 02:04 PM   [ Ignore ]   [ # 7 ]
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Yeah, I think a particle emitter is probably overkill in this sort of situation.  But a semi-transparent object with some animated refraction would probably be perfect.  You could also have part of it “light up” as part of the animation.

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Posted: 28 December 2012 03:49 PM   [ Ignore ]   [ # 8 ]
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maybe this can adapt to your project.

http://www.markbremmer.com/3Bpages/DAS5smoke.html

examine the technique - you might even be able to make a heat haze !

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Posted: 28 December 2012 07:37 PM   [ Ignore ]   [ # 9 ]
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0oseven - 28 December 2012 03:49 PM

maybe this can adapt to your project.

http://www.markbremmer.com/3Bpages/DAS5smoke.html

examine the technique - you might even be able to make a heat haze !

Or you can try thinking on your own. Try to figure out what effect you’re trying to get, look at some reference photos/videos, and figure out what’s going on. And then if you’re stumped, ask here.

It’s really not that difficult.

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Posted: 28 December 2012 08:48 PM   [ Ignore ]   [ # 10 ]
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Here is something I did, and if I would of taken out some of the dark smoky color on the scene where the F4 if at high altitude and maybe more of a BLUR that could of worked for you! BUT the F4 had a nasty habit of greasy smoky exhaust

http://www.youtube.com/watch?v=Mq7Faq6mMtc&list=UUtceKJM1WacqPjcTCtYJTwA&index=2

By the way my exhaust is a PARTICLE emitter with a BLUR applied. I was thinking of putting some refraction in the shader but not worth the render penalty.

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Posted: 28 December 2012 08:53 PM   [ Ignore ]   [ # 11 ]
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ALSO here is a test I did for the gunsmoke fro ma 20mm gattling gun on my F4 and it would make a good exhaust!

Again it is a particle emitter with some smoky shader in it and a blur.

http://www.youtube.com/watch?v=XR0RynXSPCk&list=UUtceKJM1WacqPjcTCtYJTwA

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Posted: 28 December 2012 09:46 PM   [ Ignore ]   [ # 12 ]
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JoeMamma2000 - 28 December 2012 07:37 PM
0oseven - 28 December 2012 03:49 PM

maybe this can adapt to your project.

http://www.markbremmer.com/3Bpages/DAS5smoke.html

examine the technique - you might even be able to make a heat haze !

Or you can try thinking on your own. Try to figure out what effect you’re trying to get, look at some reference photos/videos, and figure out what’s going on. And then if you’re stumped, ask here.

It’s really not that difficult.


Joe, that’s a link to a tutorial. Made by a Carrara Pro (I know, you think they’re mythical). It’s a learning resource, not the actual file. By following a tutorial, it might lead to learning how to do something. I thought you were against people thrashing about without knowing what they were doing? wink  <—Smiley.


Personally, I would probably look at a couple ways of doing it and either mix a couple methods to get my effect, or see which I liked better and then maybe using a post effect to enhance whatever the render was lacking.

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Posted: 28 December 2012 10:34 PM   [ Ignore ]   [ # 13 ]
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this is a simple effect, done in bryce, should be duplicatable in Carrara

two cones, fully transparent, with a turbulence bump and displacement applied, Refraction is 101 for both cones (100 in bryce is air)

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exhaust._.jpg
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Posted: 29 December 2012 12:56 AM   [ Ignore ]   [ # 14 ]
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Here’s a quick WIP image showing what I’ve got so far. I made an polygon object for the exhaust and applied a wave deformer to it.
I haven’t quite figured out how to animate the deformer to make the shape “ripple”
From the effects menu for the shape I enabled the blur object effect.
The material was started with a preset material - transparency 1 -

I’ll have to read up on how to make and apply animated textures to the exhaust shape

Thanks to everyone for their suggestions. They’ve been quite helpful.

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EngineExhaust_WIP_1.jpg
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Posted: 29 December 2012 08:05 AM   [ Ignore ]   [ # 15 ]
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Xeidos2 - 29 December 2012 12:56 AM

Here’s a quick WIP image showing what I’ve got so far. I made an polygon object for the exhaust and applied a wave deformer to it.
I haven’t quite figured out how to animate the deformer to make the shape “ripple”
From the effects menu for the shape I enabled the blur object effect.
The material was started with a preset material - transparency 1 -

I’ll have to read up on how to make and apply animated textures to the exhaust shape

Thanks to everyone for their suggestions. They’ve been quite helpful.


For the wave deformer, you should be able to change the parameters over time. I’ll see if I can come up with an example.


The same for the shaders. The extremely short answer to animating shaders is that if there are sliders, you should be able to adjust those over time as well. Just to emphasize, there are many, many other ways to animate shaders besides sliders. They’re just the most obvious if your new to the shading room.

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