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We know that when Illustrator creates a blend, the steps of that blend are determined also by exactly how the stacking order of those key objects are set. For example, in this case here where I have multiple objects inside of my blend. I have this file here called replace_spine. I could see very easily that I have a red arrow, then a yellow arrow and then a blue arrow, and basically the red arrow is the bottom of the stacking order, yellow is in the middle, blue is at the top. By adjusting the stacking order, I can control exactly appearance of that blend. Now when you are working with two key objects, unless you have just a start point and an end point, just two objects inside of a blend, I can easily have one brought to the front, or sending one to the back, so on and so forth. But when I'm working with multiple objects, Illustrator does not really allow me to move one of those objects and change the stacking order.
So if I want to adjust the direction that a blend is going into-- For example, instead of starting from the bottom, red, and then going to yellow, and then going to blue, though I want to maybe have the red at the top. So I want the red, to have a different of an appearance with the yellow, one with the blue as well. So what I can do is I can select that blend and I can go to the Object menu, and I could choose Blend, then I could choose this setting here called Reverse Front to Back, and that changes the stacking order so that you can see it has a little bit of different appearance. In this case here, you can see the red is in the front, because the red is more prominent, as it goes to the yellow than before. I'll press Undo and you can see this is what the blend looked like before, and I'll Redo and I could see what the blend looks like afterwards. So I can easily basically change the stacking order by choosing that option called Reverse the blend. Again, I can go to the Object menu here and choose Blend, and then choose Reverse Front to Back.
Now you notice, there is another reverse setting here also called Reverse Spine, this comes into play when working with animation. Now, if I had two objects and I create a blend, because I want to create the tween steps to create some kind of an animation. The stacking order determines, direction that blend goes in. So when I first actually create that animation out of Illustrator, it will go from the bottommost object to whatever the topmost object is. But if I want that blend to go in reverse, I want the start of the top object and go to the bottom, then I can choose the option called Reverse Spine, and that will basically have the object go the other way as well. So there are many ways that you can actually choose to Reverse the Spine and also Reverse Front to Back to control exactly the appearance of your blend.
And also more importantly this comes to play, when working with animations out of Illustrator, to actually adjust the way that the animation plays, when you play it back out of Illustrator, as a Flash animation.
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