[Victor]

@vfxtodd 27517 wrote:

I’m trying to limit the key from the IBK Keyer to just a specific area of the shot so that it doesn’t pull anything outside of the greenscreen area.

Note in the screenshot the area I want the IBK Keyer to ignore. I’m still relatively new to Nuke so I’m still trying to figure out techniques.

I tried copying the footage Read node, adding a Bezier to the copy and connecting the two with a Merge node set to over with the roto’d shot set to “A” and the GS node connected to “B”, since I want the roto’d area on top. But that doesn’t seem to do it.

Can someone suggest a better approach?

Thanks in advance.

Did u put a premult node after your bezier?..that might help.

[Victor]

@vfxtodd 27633 wrote:

alienox,

The Bezier nodes have the same settings. So, is it the stacked order of the Beziers that make Bezier 2 cut out the others?

Thanks.

Yup. In your case i’d leave the cutout beziers as the last nodes in your roto tree…

[Victor]

@vfxtodd 27592 wrote:

I tried that, but it didn’t work. Unless there are other settings to change besides swinging the color to black?

cut and paste this into your script…

set cut_paste_input [stack 0]
version 5.1300
push $cut_paste_input
Bezier {
output alpha
points {{
{344 462 0 -0.47}
{468 210 0 -1.98}
{202 113 0 2.67}
{112 403 0 1.16}
}}
shape {{curve L x1 0}}
center {360 288}
name Bezier1
selected true
xpos -158
ypos -414
}
Bezier {
output alpha
points {{
{335 377 45 1.06 45}
{502 402 45 -0.59 45}
{565 212 34.1 -1.61 34.1}
{492 100 34.1 -2.8 34.1}
{362 136 35.8 2.11 35.8}
}}
shape {{curve L x1 0}}
center {360 288}
name Bezier3
selected true
xpos -158
ypos -385
}
Bezier {
output alpha
points {{
{315 418 36.9 -0.1 36.9}
{422 284 30 -1.16 30}
{374 218 30 -2.8 30}
{243 185 28.1 2.55 28.1}
{236 297 28.1 1.25 28.1}
}}
shape {{curve L x1 0}}
center {360 288}
color 0
name Bezier2
selected true
xpos -158
ypos -356
}

[Victor]

@bradleyvance 27582 wrote:

To subtract one bezier from another I generally use the “Channel Merge” and set it to “Minus”

another way would be to go to the color tab on the bezier node and swing the color to black. keeps the tree clean.

[Victor]

kutakinte wrote:

Hi ppl,

Thanx so much for the advises. This really helps me understand a lot more. You guys are the greatest!! I think i got it now. Thanx again. Cheers!

kutakinte 😉

Hey Matt, hows life at 2isted? Having fun with ASAD lights?

[Author]

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