How to Implement Multiple Masks?

Byron K wrote on 4/16/2010, 1:14 PM

Wondering if anyone has any tips how to use multiple masks. I created three different white on transparent alpha shapes.

I can implement the first shape on Track 1 by setting to Multiply
2nd track which shows thru the mask to Composite Child of the mask
3rd track, background of the mask is Source Alpha.

How do I implement the 2nd & 3rd mask shapes to show track 2 thru it?

Cookie cutter would be pretty easy but it seems that the shapes can't be changed.

Thanks!
Byron

Comments

Byron K wrote on 4/17/2010, 12:20 AM

After playing around w/ this for a few hours, I've come to the conclusion that I have to redraw the multiple shapes using the Bezier mask.

If there is a way to import multiple masks pls share the tip.

Thanks!

Steve Crouch wrote on 4/17/2010, 3:52 AM

I haven't tried this, but couldn't you use nested vegs to do this:

Load the three masks into tracks in a veg file, all set to source alpha. So this project would render to the "union" of the masks.

Then use this veg in track 1 of your original project to mask track 2.

This is going to be a pain to move the shapes around to line up with objects in the source video though.

Alternatively, you could repeat the source video, this is probably going to be inefficient to render, but should be easier to align the masks with the shapes in the source video:

Track 1: Mask 1 - Multiply
Track 2: Source video - Composite child of track 1
Track 3: Mask 2 - Multiply
Track 4: Source video - Composite child of track 3
Track 5: Mask 3 - Multiply
Track 6: Source video - Composite child of track 5
Track 7: Background

Byron K wrote on 4/18/2010, 11:02 AM

Thanks Steve! Yes, moving the shapes around may be tough, worth trying tho.

Rory Cooper wrote on 4/18/2010, 11:25 PM

Byron if I have a solid white on track 1 mutiply I can have 20 tracks underneath all child of track 1 and it will mask all the alpha channels underneath.

Simply create a new track I and make the mutiply mask child and all the subsequent tracks child of that = grand child. and back ground media underneath

Rory

TeetimeNC wrote on 4/19/2010, 5:45 AM

Rory, you are the king of compositing! This sounds useful but I don't quite follow. Could you describe a simple example and what the composite would render to (i.e., what the end result would look like)?

/jerry

Rory Cooper wrote on 4/19/2010, 7:15 AM

Jerry in this clip I am using one mask copied to 7 masks in one clip one render

Track 9 mask out wine glass copy mask and past for all masks
Text same mask neg
Text 2 same mask positive mask with sphere fx track 5 & 6
Top black track is a mask which is added to give a light on glass to all tracks below except 10 & 11 as it has its own parent mask
Copied this and composited this as 7 & 8 ADD for reflection in whine glass
Track 10 is a plain rectangle mask multiplied parent so is separated from back which is plain white

Hope this makes sense

..... pic of layers at end of clip

Rory

TeetimeNC wrote on 4/19/2010, 9:25 AM

Thanks Rory, that helps. I'll have to spend a bit more time with the Vegas screen shot on one monitor and the video on another to fully understand what you are doing. I really like the overall effect - nicely done spot!

/jerry

Rory Cooper wrote on 4/20/2010, 1:28 AM

thanks Jerry .I can send you the veg keep the glass I will replace the media with color blanks to keep small then zip when you get replace with your own then it will be easier to see

Rory

TeetimeNC wrote on 4/20/2010, 3:41 AM

Thanks Rory, I look forward to seeing it. SCS should put you on the payroll ;-).

/jerry