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When you work with moving objects, motion blur will become a very important way to create realism. There are several ways to create motion blur. One is through the Maya Software Renderer, and then mental ray has its own way of creating motion blur. So, we have this simple airplane, and it's flying through the scene. Now, I'm using the Maya Software Renderer for this particular scene and when we render it, you'll see that, well, it's a nice still image, but you know, the propeller is not really looking like it's turning, and the airplane just looks like it's kind of sitting on the shelf.
There is no motion blur, no sense of motion. Now, what causes motion blur is that, well, the object moves while the shutter of the camera is open. So, the faster it's moving, the more it will blur. We can set up motion blur in our Render Settings. So each renderer has different types of motion blur. So, the Maya Software Renderer here has its own Motion Blur here. So we have a special rollout for Motion Blur in the Maya Software Renderer.
Now all we have to do is turn it on and determine what type of motion blur we want to use. There are two types of motion blur. 2D basically just determines the blurring within the frame. So, it's basically left, right, up, down type of blurring. So for many situations 2D motion blur is fine. But when you have an object that say tumbling or rotating in space that's moving towards or away from the camera on the Z axis, for example, you'll need to use 3D motion blur, and they have some different parameters.
So when you motion blur in 2D, you can give it a specific blur length, or you can actually give it a very specific shutter open and close. So, if you want to simulate a real world camera, you can. You can also determine the sharpness of the blur, and whether you want to smooth to alpha or color channel. Now, when I do this, let's go ahead and just keep this at these values here and just do a quick render. So you can see that what it's doing is it's blurring basically the motion of this across the screen.
So we're not really getting the radial motion of the propeller, because we're using 2D and we're just getting kind of a back and forth smearing type of effect. And that can be great for some effects, and also, this type of motion blur renders really fast. So sometimes you'll just want to use this because you need to get things out the door. I do want to show you something else here. Now, if we change this from color to alpha, you're going to get a different effect. Now a lot of times you're going to get an undesirable effect, but sometimes you'll get little artifacts around the edges, because it's actually blurring to the alpha channel.
It just depends on what you have behind your object. Now, let's go ahead to 3D motion blur, and there is really only one thing that you can have is how much of a blur, so basically you're turning it up or down. So, Blur by frame is basically the larger the number, the more the blur. So, I'm going to leave this at 1, and let's go ahead and do a quick motion blur. Now you can see that this is much different quality of motion blur. We're getting a blur of the propeller spinning, and then we're also getting a little bit of motion of the plane but not nearly as much as we're getting with the 2D motion blur.
Of course, we could change the parameters of the 2D motion blur to kind of change that, but you can see that this is much more realistic. Of course, if we amp this up, let's make it up to say 2.5, we'll get a much more enhanced effect. So you can see that basically the higher that number, the more of a motion blur effect we get. So, when you're using the Maya Software Renderer, just remember we have two types of Motion Blur. We have 2D Motion Blur, which basically is just smearing the pixels, and we have 3D Motion Blur, which takes longer to render, but it creates a more physically accurate type of motion blur.
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