Helicopter rotor motion blur's motion question

[virtualcomposer]

Don't forget though there's a pulsing action even with the blur. How can this be achieved?

[Red_Oddity]

Originally Posted by virtualcomposer

Don't forget though there's a pulsing action even with the blur. How can this be achieved?

Same technique, the blades are moving at such a speed they 'appear' to create a sort of interlaced effect where the blades are creating the rotational blur effect, but every other frame (hope i make sense).

[CC Rider]

This is due to the camera shutter. My earlier post explains a little about this...experiment with the "shutter efficiency" control. Start with around 50%

[Red_Oddity]

Easiest way to do or test this.

Create rotor blades en place in Layout.
set a key on frame 0 and one on frame 1 of the rotorblade's Heading rotation (set Pre and Post Behaviour of the keys to Linear (in the Graph editor).

Turn on motion blur of the camera and turn on OpenGL DOF/MBlur Preview, up the amount of passes of the DOF/MBlur Preview in the Display Preferences tab so it roughly matches the rendered motion blur.

You should now see a blurring rotor blade in OpenGL that roughly looks like your rendered blade.

Open the Graph Editor again, select the second key frame of the rotorblade you created earlier.

Press Play, now drag the keyframe value in the Graph editor up or down, you should now have instant feedback of what the rotor blade does (including the 'blinking/jitter' effect)

[edit]

like so : www.svenneve.com/media/rotorblades.html

done on a low end system with a completely borked mouse, and just a quicky in Camtasia demo, but it guess it shows what i mean.

Here's the preview/playblast of the final result : http://www.svenneve.com/media/rotorblades_preview.mp4

[/edit]

[Red_Oddity]

I forgot to mention, if you really need to have the blades doing the proper speed, rather than tweaking the rotation keyframe, you should tweak the shutter speed, as CC Rider mentioned, during the playback tweak phase.