Rotoing Motion Blur

[user_deleted]

any suggestions for dealing with motion blur? The softedges really aren't doing it for me. Is anyone using quickpaint for this sort of thing?

I've tried simply putting the rotoshape inside the motionblur and then applying the motionblur in the rotoshape parameters, but it's not enough.

Ideas?

[user_deleted]

Right, I've been struggling a bit more with this thing. When I said that softedges weren't doing it for me I basically meant that I thought they were a hazzle to work with.

After beating myself over the head all night, I realized that it was easier to first do the rotoshape inside the motionblur all through the sequence and then come back and pull out the softedges.

Now this is easier and is giving me results that are approaching something acceptable, but I'm not really happy with it.

So a more appropriate question might be: What is your roto workflow when you have a lot of motionblur in your sequence?

Feature request:

A way of distinguishing between hardegde point from softedge point in a rotoshape.

[user_deleted]

How about turning motion blur on in the rotoshape?

[user_deleted]

Yeah I did that but sometimes it's not _enough_ motion blur, even at the highest setting. Writing this I just realized that there might be some globals setting to change this. Will check before I write more stupid things.

[user_deleted]

You should be able to enter a higher number in the shutter to get as much motion blur as you want. Sometimes you will get artifacts but I found putting the motion blur parameters to 2 seems to smooth them out. (not sure why because to my knowledge 0 is off and 1 is on.)

Changing numbers in the Globals parameters will modify motion blur in all of your nodes which I don't think you want to do in this case.

[user_deleted]

Mmmm, I saw the it in the globals and played around with it for a while. But I might just chose another shot to work on. Rotoing a person with lots of hair and billowing clothes moving that is moving really fast was just.... not fun.

Question for the ppl that have roto as bread n' butter: Do you ever get to roto long shots (say, more than 50 frames) with hair flapping around in them?

[user_deleted]

roto is not my bread and butter but I will answer anyway. With hair you need to pull out all the guns. If the talent has dark hair and the background is light (or visa versa) try a luma key multiplied with a garbage mask. Maybe you can get a uable matte by fucking with the channels?

You will probably need to combine a number of different techniques to get it to work - Last resort track and patch.

[user_deleted]

Thanks for picking up the thread again.

What dou you mean by track and patch? I'm not sure that there is any trackable data in the hair.

[user_deleted]

Here's something that works sometimes. It's the long way but it does give good results.

Roto on the inside "solid" edge of your shape. Degrain. Use a directional blur ( depends on the situation, you may want a rotational blur with a pivot point for other situations,) and blur your image, matching closely to the original image. This will take some keyframes to match changes in velocity, etc. Regrain. Comp back over your bg. If you have some kind of edge blender ( as suggested,) this'll help too. GenArts EdgeFlash is good.

Hair and clothes! classic!

Hope this helps.

jon a

[user_deleted]

Thanks buddy, I'll give it a try.