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FrankFirsching

Challenge: condensation trails

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The goal of this challenge is to visualize the movement of a certain object over time. Examples are condensation trails of jets or a robotic arm, that is painting (see both attached movies).

Rules:

1.) The objects need not be moved along a motion-path. They can be animated by keyframes or even be simulated by rigid-body dynamics.

2.) The trail or paint is smearing over time.

Hope you like it :)

P.S.: Is there any free program, that creates good animated gifs? ImageMagick's convert produces huge files. :blink:

jetplane.avi

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Nice anims!

But after posting this yesterday, I remembered that Houdini has a built in trail-SOP! I was building a solution, without this SOP, which was much more challenging.

So to make it a bit more interesting:

Rule 3) The use of the trail-SOP is forbidden :P

Typing in the operator name to create it isn't always good, because I would have noticed the trail-SOP before, if I had to search the OPs in the menus :-(

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Rule 3) The use of the trail-SOP is forbidden

Just when I was about to post it :angry:

P.S.: Is there any free program, that creates good animated gifs? ImageMagick's convert produces huge files.

try gifsicle

Ok back to the drawing board ;)

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IMHO, the only restriction on challenges should be the use of houdini alone. One could argue that by doing this challenge without the use of the trail sop you might learn something new about houdini that you didn't know before. However, there's many of us new to houdini that wouldn't even know how to use the trail sop to accomplish this effect which means that this restriction would be silly. I'd say, let's promote the most clever use of houdini irregardless of what features are used.

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...and I only used trail to compute "v" :(

Nevertheless, i'm almost there, If only I can bend my mind around the channel SOP <_<

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Hey anakin78z,

Your cartoony speed blur looks cool so I thought I'd give it a go. I'm passing color and alpha up from pops to sops and using add to join the particles with lines then I skin them. Everything works swell in wire mode, I can even see the color and alpha but after I skin it it goes black and when I render it renders black. Don't suppose you could throw me a bone. ;)

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Heres a still shot from my not so great entry. ;) I was wondering what are you guys using to get that tube like smoke look?

post-21-1088436007.jpg

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Hey! Any hip files?! :)

Sorry for asking... but any Houdini example is just so precious.

:)

Thanks.

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here ya go. I went for the videogame type trails. B)

Nice. I like it. Does anyone have the scene files ( for those of us who would like to learn).

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Nice. I like it. Does anyone have the scene files ( for those of us who would like to learn).

I don't have that original scene file anymore, and have no idea if this is how I did it back then, but here's a hip file with a simple technique to create a trail like that.

Enjoy,

-z

trails.hip

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