Zoom Following (Technique 1); Summary Tips

This article simply synopsizes my first Zoom Following technique. It was something I discovered in the October/November 2009 timeframe. Of all the functions provided by ProShow, only the values in the zoom box are not directly usable via a modifier. You can follow the value of any other layer’s function values (pan, rotation, tilt, opacity, blur etc) easily. The value you see in the zoom box, however, is NOT what a ProShow modifier sees. ProShow saw fit to cause a reference to a lower level of functioning. That value is something like a percent of a percent … but more than that. Somehow, ProShow sees the zoom settings along the entire timeline through the value in the zoom box. I don’t know how it’s done … I just know that it is. It’s something I discovered while working out the 2nd technique for zoom following. For that version, see  Simple Modifier-Based Zoom for an introduction to it (discovered around the October/November 2011 timeframe). It shares none of same limitations of the 1st technique, save for the reference to rotation and tilt (both still break the technique).

ASSUMPTION. Assume Layer 1 is the layer being followed and Layer 2 is the layer doing the following.

ZOOM FOLLOWING (of another layer).
Hover over the Zoom-X (or Zoom-Y) Box. Right click. Select Add modifier.  Variable Amount Based On: Zoom-X (or Zoom-Y); From: Layer 1;  Multiplied By: 1; (this is the first action)
Add another action: Click on the big “+” in the Actions title line.
Set Type of Action to [-] Subtract from Modifier;  Constant Amount: 100.

These actions should apply to ALL KEYFRAMES.
The two actions should look like the following:

+ Zoom X from Layer 1 (“Gradient #”)
-100

where, “Gradient #” refers to the type of layer being followed and its layer number.

NOTE: Set the Zoom-X and Zoom-Y values to the largest value of Zoom on the layer begin followed.

NOTES and LIMITATIONS


1.    If the layer being followed has a maximum zoom of 90, then the largest zoom of the follower layer is set to 90. If the largest zoom followed layer is 110, then set the follower layer’s zoom to 110.
2.    If the value of the maximum zoom is over 200 the dependent layers may not zoom down to zero the same as the master layer. This is NOT necessarily true but may depend on your scale settings. For instance, if you’re using a scale of “Fit to Safe Zone,” you may see it sooner than if you are using a scale of “Fill Frame.”
3.     Zoom actions … when you follow the zoom of another layer, you’re using a value that appears to be interpreted as percent of a percent in the referencing/following layers’ zoom (unexpected zoom values are possible if you don’t provide a correction value). Adding the -100 action after the zoom reference to the master layer seems to create a correction that works well for most zoom values below a maximum zoom of 200 in the master/reference layer.
4.    DO NOT enter a rotation amount for any of these layers. For some reason, a rotation breaks this “fix” I’ve discovered.
5.    TILT cannot be used with this technique of zoom following either. Tile is a form of rotation. Even a simple reference to the tilt box will corrupt the link. The function Tilt was introduced with ProShow version 5.
6.   Set both the Following and Follower layers to the same scale. If one is Fill Frame, the other should use Fill Frame. They both now have a common scale and reference point. Different scales between the follower and following layers will result in some different zoom results. I’ll call them “interesting” for lack of a better description. Depending on the layer aspects (ratio of one set of sides to the other), the scale mode can result in significant differences in the effective layer zoom. For instance, Fit to Safe Zone is a effectively a percent of the mode Fit to Frame.

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