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help creating 3d twisted arrows for environmental flows of radiation, convection

oompa

not sure where this post belongs...

i'm looking for a way to make those slicks twisted 3d arrows typically found in sectional drawings - often in perspective - which attempt to articulate flows of hot and cold air. They are found in drawings illustrating the heat flows, often to demonstrate the use of passive strategies....

I can't tell if they're coming from stock art catalogs, modeled entirely in 3d (they match the perspective) or some other technique in illustrator....

it seems silly but I want to recreate what I've seen - and I can't for the life of me figure this one out...

thanks, in advance!

 
Oct 24, 10 10:23 pm
binary

~~~~~~~~~>

Oct 24, 10 11:01 pm  · 
 · 
holz.box

i've created them in autocad before (just arcs and lines) and i think there is a way to twist an arrow in illustrator, but my computer is fukt and i can't open any adobe products right now.

Oct 24, 10 11:02 pm  · 
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greyvsgray

post an image....

Oct 25, 10 12:44 am  · 
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holz.box

i think they mean like these...


Oct 25, 10 1:18 am  · 
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greyvsgray

ah yes; that is a pretty quick illustrator task; I would do pen tool>live paint;
but there's probably a dozen other ways to do it.

if referring to actual 3D arrows, probably model in rhino, 3ds, c4d, then export linework, or even render your 3D arrow; I've seen this done poorly more often then not; if you use sketchup, pay attention to the curve segments, or you'll get blocky instead of curvy

Oct 25, 10 1:32 am  · 
 · 
greyvsgray

I've heard these referred to as "magic arrows" :)

Oct 25, 10 1:35 am  · 
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vikrum

i usually call them smart arrows.

Oct 25, 10 9:13 am  · 
 · 
weAREtheSTONES

I call them ribbon arrows

Oct 25, 10 8:42 pm  · 
 · 
holz.box

"magic" - because the building never performs like the fancy diagram indicates?

Oct 25, 10 10:18 pm  · 
 · 
Milwaukee08

I call them wishing arrows. Cuz that's how you wish the building works.

Or bullshit arrows, same thing.

Oct 25, 10 10:23 pm  · 
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Distant Unicorn


Like these? N/T.

Oct 25, 10 11:46 pm  · 
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Rusty!

Milwuakee08: "Wishing arrows" made me LOL myself in the pants.

Unicorn: They need to be much fatter. And what's with purple? I understand red/blue as hot/cold, exhaust/intake. Does purple mean direction of unicorn farts? If so, where's the horse's ass in that diagram?

Oct 26, 10 12:49 am  · 
 · 
vikrum

Red + Blue = Purple.
Let's be nice now....
Unicorn was simply showing both options overlaid on top of each other .
No need to insult the colour of his farts.

Oct 26, 10 3:14 am  · 
 · 
oompa

holz, those ARROWS images are close but I meant in 3d.

Unicorn ghost - they would have to be more twisted but that's the basic gist - is there a quick way to make those, can you tell me how you made them?

Oct 26, 10 10:29 am  · 
 · 
greyvsgray

oompa, that's a 3D model, with some basic rendering applied---do you have access to 3D software? I'm afraid that if you don't recognize this already, you're going to have a tough time making your arrows :(

Oct 26, 10 4:37 pm  · 
 · 
Distant Unicorn

You make a segmented rectangle. 30-40 segments. Basically, lots of thin rectangles stacked side-by-side.

You taper down one end. Add the add ends.

Then you twist the object along the axis through the center. I twisted mine 180 degrees. Then you bend them in the direction you want to bend them in.

I made these in SketchUp. I'm assuming that the process is pretty similar since the plugins I use to make this in sketchup are very similar to ones found in 3dsmax.

Oct 26, 10 5:12 pm  · 
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oompa

yeah, ok. in max, those operations are no problem...i just assumed there was an "out of the box" arrow solution....thanks!

Oct 26, 10 5:18 pm  · 
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Rusty!

Unicron, here is your big business opportunity break. Create a 3D plugin that makes custom bullshit arrows. You'll be filthy rich by Sunday.

Oct 26, 10 5:48 pm  · 
 · 
Distant Unicorn

I can only code in SQL.

Programming, like mathematics, is lost on me.

Oct 26, 10 5:58 pm  · 
 · 
Rusty!

SQL?

I guess all those mad Excel skills have come to full use :)

Oct 26, 10 6:14 pm  · 
 · 
Distant Unicorn

Bitches don't know about my ACCESS.

Oct 26, 10 6:30 pm  · 
 ·  1

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