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Re: Wipes,borders etc.

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Tim WilsonRe: Wipes,borders etc.
by on Aug 20, 2001 at 12:40:06 pm

You're quite right, sometimes there's nothing that will do besides a switcher-style wipe. There are a number of ways of simulating these in Boris with a lot of flexibility, and the principle is the same: the source of the wipe is an animated upstream mask, that is, a mask on the face track.

The easiest one to animate is a straight rectangle wipe, using the border of the frame as the shape.

1) Create a new track to use as the mask. The media doesn't matter - V1 or V2 is fine.

2) Decide which direction you want the wipe to go - you can change your mind later, but you need to set keyframes. So say you're going to wipe IN - select your first keyframe, and slide the Crop slider to the center point, so that your new track disappears.

(Why the center point? Because if you crop past the center, the crop becomes a reveal - move the slider past the center point and you'll see what I mean. It makes sense if you think about it, but can be startling if you're not expecting it.)

If your default parameter is an animated one such as Linear or Ease In/Out, you already have an animation. Play it back - the crop should now expand to reveal your track. Flavor to taste, and name this layer Mask.

3) Use the Disclosure Triangle to twirl down the layer you want to perform the wipe on, which I'm going to assume is V1. Take the Mask layer you completed in step 2 and nest it in the FACE of V1. Play it back, and you have your wipe.

4) To add a border, go to the Border tab of V1. To see what you're doing, select the first keyframe, turn "Snap CTI to Keyframe" in the Track menu OFF (which I always do anyway), then move the CTI to somewhere in the middle of the effect so that you can see the results of your changes.

Now set your border to taste. You can pick any color, any width, set the softness of the border, the source or both. To get a true switcher-type effect, you'll want to set the parameters to Constant, set the "Border and Source" pop-up to Border, the softness to zero, and set a nice fat border of white, green, blue....some nice, switcher-y color.

If you want to break the rules, make the border and/or the source soft. A soft yellow border makes a nice glow. Or heck, animate the color of the border as you go. Animate the width and softness, too - lots of possibilities here.

Now SAVE this effect so that you NEVER have to build this from scratch again. :-) From here, it's easy to customize. Switch your first and last keyframes on the crop to reverse the wipe, for example.

The real flexibility comes as you animate other kinds of masks. The only thing you change is step 2.

Say you have a logo - very easy to use that as the shape of the wipe by animating its scale, especially if it's an EPS file. Step 1, create new track, step two, animate scale instead of crop. The reason I like EPS files is that they stay sharp as they scale (the virtue of vectors), although you can fake this by scaling up a bitmapped logo in Photoshop, so that its 100% size is just larger than your video frame (720 by 480 in DV for example).

Now continue to step 3: drop it in the Mask track of the FACE of V1, set the border and voila, a custom logo wipe with a border.

Use any of our spline primitive shapes to do the same, of course, and you can have wipes using stars, circles, hearts, and so on.

For a switcher simulation you'll need to keep the mask shape static, but there's no law that says you have to in principle. :-) You can create a custom spline animation - such as using vector paint to fill the screen. Place that as an upstream mask and you can have a bordered paint wipe. You getting the idea?

A similar approach can use a gradient as the source of the wipe. Create a new layer with a gradient - use one of ours to start, although this effect really lights up with the gradients in the Pixelan Video Spice Rack (http://www.pixelan.com), which were created to form the basis of wipes. Apply a Luma Darker Key, and use the first tab of that filter to set your first keyframe to black, and the last keyframe to white. That creates the wipe, so now do to step 3 above: drop it in the mask of the FACE track of V1, set border, etc.

There are several wipes in the Keyframe Library in the Splines>2D Splines category that use multiple iterations of Spline Primitive media to do wipes that look like 60s style, Rankin-Bass animations - lots of fun.

Last but not least, switchers use borders to edge their wipes, but, just for the heck of it, you can use a shadow instead.

Once you get hold of the power of animated masks, the rules fly out the window, and you can do pretty much anything you want.

Best,
Tim



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