way to make underwater propella look fast?

Drekkan

I doing an underwater scene and it features a propella from a boat whirring round underwater but I am not sure how you can make it look like it is moving fast as the way I have it just looks as if it is static. Is there something like an a more cartoonish set of effects or whatever that you can add to it to make it look like its going round? or maybe another way. I don't need to mess around with anything like airbubbles either I think I have that part covered.

Any idea's? thanks.

Serene Night

You may have to do a bit of motion blur on that either in post work or in studio.

father1776

PS blur the prop, then add bubble streams in a spiral from the prop and behind it.

the bubbles in the spiral bubble stream must be tiny

good luck

Drekkan

father1776_5775a1855d said:

PS blur the prop, then add bubble streams in a spiral from the prop and behind it.

the bubbles in the spiral bubble stream must be tiny

good luck

Thanks.

nicstt

father1776_5775a1855d said:

PS blur the prop, then add bubble streams in a spiral from the prop and behind it.

the bubbles in the spiral bubble stream must be tiny

good luck

And lots of them too.

Jabba

If you render it with 3Delight in DAZ Studio instead of iray, you can use motion blur in the render settings if the propeller can rotate on the model you're using. 

I did a wee tut a while back, so render settings tab will now look different, but the functions are all still in there... http://fav.me/d6b85jr

nDelphi

Postwork is another option. I have use Photoshop's radial blur on airplane propellers and vehicle tires with ease.

McGyver

It's a fairly complicated effect to get right... I'd either do it in postwork, or create a stupidly complicated prop with elongated bubbles mapped to it... A spiral or helix on the outside, with a cone with far more and denser packed bubbles inside that, then probably a tail of rising bubbles (some round, some flattened) mapped either to a plane, or to a custom sculpted shape... It would depend on what the propeller was on... A speedboat or large ship... Different vessels make decidedly different effects and patterns. 

I'm surprised there is no prop for that... If there is none I'll add that to my list of crap to make.

KurzonDax

If you go the easier(?) route of blurring it in Photoshop using radial blur, a trick I have used is to do your render twice.  The first time, hide just the propeller and render everything.  For the second one, hide everything except the propeller.  Make sure in the second render you don't render the dome or backdrop (if you're using either).  It should just be the propeller on a transparent background.

Open your first render in photoshop, then add the second render as a layer.  Now you can apply the radial blur to the propeller only.

So now that I'm thinking about it, when I've done this in the past I was using just a dome for scene lighting.  If you have scene lights, you'll want to leave them visible in the second render.