Thanks again, borate. I solved the split clip problem by finding the value of the animation line at the same point in another unsplit clip as the end of the first clip of the split clip and used that as the value at that point in time at the end of the first clip and the beginning of the second clip. That works just fine and seems easier than the second sequence approach.
A Z-axis is one that is perpendicular to the X and Y axes, that is, a value of 0 on the Z axis is in the plane of the video or picture, negative values are further away from the viewer behind the plane of the video or picture, and positive values are closer to the viewer in front of the plane of the video or picture. The combination of coordinates on the X, Y, and Z axes describe a three dimensional space. I don't see how rotate and scale could simulate that. Rotation is in the plane of the video/picture, and scale just makes the video/picture larger or smaller. Yes, scale could simulate perspective because objects appear larger when they are closer to the view and smaller when they are farther away, but that doesn't solve the problem of having one object directly in front of another and then switching the position of the objects along the Z axis.
https://www.google.com/search?q=z+axis+in+video+editor
I haven't read any of those articles, but it looks like in some video editing software you can specify values on the Z axis.
In Microsoft Word you can specify that a graphic is in front of text or behind text. That is moving the graphic along the Z axis.
In VideoPad the only way you can specify where a track is on the Z axis is by control-dragging the entire track above or below another track. I experimented to see whether I could drag just a clip above another track rather than the entire track and it doesn't allow that.
I don't want to share my whole project and all the source files. I might upload a rendered version of just the section of the video that I'm having a problem with, showing the upper right clip successfully flipping down over a period of 2.5 seconds to cover the lower right clip and then back up over the next 2.5 seconds, and then the lower right clip flipping up over a period of 2.5 seconds but unsuccessfully going *behind* the upper right clip rather than in front and then back down over the next 2.5 seconds. I want the lower right clip to be higher on the Z axis than the upper right clip just for the 5 seconds when it's flipping up and back down, not for the whole duration of the clip.
