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Let's look at motion blur in Mental Ray, going to scroll down to about frame 75 when both those objects are in motion. And I can turn on Motion Blur for Mental Ray in the same way as for the software render by selecting the objects, right-click in object properties, and I can enable Object Motion Blur but not Image Motion Blur. Mental Ray only works on object basis, and click OK. And that way, only those objects are going to get blurred.
If you need everything in this scene to be blurred, you can do that from the Render Setup dialog. So go into Render Setup, and I've got Mental Ray as my active renderer. And in the renderer tab, you can scroll down, and you'll see camera effects, Motion Blur. You'll need to enable it. And if blur all objects is on, then it doesn't matter what the state of the object properties is. It'll get blurred anyway. We've got a default shutter duration of half a frame. We have a shutter offset as well, and what that does is it pushes the exposure by a certain amount.
So basically, the exposure happens in the middle of the frame, but what's happening here is that it's the first half that's going to get blurred. So it's a little bit difficult to explain, but basically, the shutter is open for half of a frame. But it's the first half of the frame, as set here. So basically, what you want to do for the most photorealistic effect is to set the shutter offset to be a negative value that's half of the duration. Then we have the motion segments.
This is how many copies are going to get drawn. And one motion segment is not going to produce anything. We need to increase this. The maximum is 15. I'm going to set it at a value of 12. And additionally, you'll notice time samples is grayed out. And that's because we're in the unified sampling mode here. I've got a quality of one here and go ahead and click Render. So with a sample quality of one and 12 time samples, we are still getting some grain here. So I can try to increase the motions segments to its maximum of 15.
But we're still going to get some grain here. And this might not be a problem, you know? It's moving fast enough that our audience may not notice that grain, but if you really want to get the maximum quality out of this, what you'll need to do is use the old school Classic sampling mode here. And I'm going to leave those values at their default. But go back down into the camera settings here, camera effects. You'll see time samples is no longer grayed out. So I can set my motion samples down to about 12 but increase the time samples up a bit.
It maxes out at a 100, probably a value of 12 is good enough. Click Render, and it will take longer to render. But you will fight that grain; you'll kind of smooth it out. So you can see that's a much cleaner motion blur now. Once again, if the grain is okay, then you can just use the unified sampling mode. But if you really want to eliminate that grain, then you can use the Classic Ray Traced sampling mode up here and then increase the time samples slightly.
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