Spinning propellers

#1

Anyone know how to replicate the effect in the attached pic?

The props seem to fade to nothing almost like smoke.

Using a semi transparent propeller object with blurred prop map I cant come close to this quality.

Anyone have any ideas?

#2

Rotate the blades at the speed they would rotate in the real life, apply motion blur. Done :slight_smile:

Of course you’d need insane amount of AA-passes to achieve good enough quality with the legacy MB-engine, but with the new (since 9.2) photoreal motionblur it’s not too hard to achieve and it should still render pretty fast.

#3

I sense another Proton mini-tut…

#4

Cheers.

The demo the pic is from has the blades rotating very slowly, you know, with the optical illusion making them look slow when they are spinning fast.

The motion blur is fine but doesnt replicate what I am after.

What I need is very slow rotating, faded props.

#5

Give them a rotation of 361 degrees per frame with motion blur. See if that works.
Or just search for tutorials on the subject. I’m sure it can be done cheaply through transparency maps as well (if you mind the many rendering passes), the subject actually has been brought up to various LW forums many times.

#6

go over to www.military-meshes.com and have a look in their forum. I recall a couple of similar threads. If a recall correctly you use photoshop to produce an image map of the props using radial blur to get the look you need, then do a transparency map. the Prop only then needs to rotate slowly to give the effectr your chasing.

hope you find it

cheers

MArtyn

#7

Photoreal Motion Blur should do what you want (the tips may need to be manually faded, but it depends on what level of realism you’re striving for) - Just have to animate the blades rotating at the high speed as has already been mentioned in this thread by Niklas. Just make sure Shutter Efficiency is set to 50% and not 100% or the blur looks too streaked. Adaptive sampling will clean the noise up real well too (without needing any Antialiasing).

Alternatively, I’ve done something like this using weightmaps and transparency. Create the blades using a disc that you bevel inwards (no shift!). Delete the central poly, and every x polys to leave you with a ‘fan’ looking object. Each ‘blade’ should have a few segments - Use a weightmap and paint the edge points with 100%, the next in with 50% and leave the center at 0%…

Use the weightmap to control the transparency. It saves on painting an image map to do it, and its pretty fast… I have an example of it in use in a still image here…

http://www.kevman3d.com/images.asp?section=3dimage&id=3

#8

Thanks guys, that was a big help.

Thanks to your advice got the result I was after.

Cheers.

#9

you can also use radial blur, effect.

#10

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