RotoPaint - Nuke 101: Professional Compositing and Visual Effects - page 282

Thislonglistofstepscreatedthenoiseimageyouneeded.Therearealotofother
ways to get something like this, but this will do here.
You now need to create a matte for the windshield.
13. Select Read1 and press Shift-P to branch out a RotoPaint node.
Since you only want to create the Bézier on the alpha channel, uncheck the Red,
Green,andBlueboxesatthetopofRotoPaint1'sPropertiespanel( FIGURE 6.55 ) .
Figure 6.55. You can create images in any combination of channels.
14. Make sure you are viewing RotoPaint1. Select the Bézier tool and start drawing
to trace the edges of the windshield ( FIGURE 6.56 ) .
Figure 6.56. My Bézier shape for the windshield.
15. RefineyourshapebychangingtheBézierhandlesandmovingthingsarounduntil
you've created a matte you're happy with.