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VRay Motion Blur Examples

The effect of motion blur. To achieve a motion blur effect you need at least 2 frames for VRay to assume mesh motion (a change in the position/orientation) and blur that mesh accordingly:

Motion blur - off	Motion blur - on

The following scene consists of three-frame animation of moving cone. In the first frame the cone is on the left. In the second frame it is at the box. And in the third frame the cone is on the right:

Scene Setup	Frame 3 with Motion blur

The following images demonstrate the effect of the Duration (frames) parameter values. This is frame #3 rendered with Analytic sampling, Min samples = 4, Max samples = 8, Geometry samples = 5.

Duration(frames)=0.5	Duration (frames)=2

The following images demonstrate the Geometry samples parameter. Duration (frames) is set to 2. All other parameters are the same as for the previous images. The higher value is set for Geometry samples the more accurate is the estimated object motion. However excessive increase of this value will result in long rendering times:

Geometry samples=2	Geometry samples=8

The following images demonstrate the difference between Monte Carlo sampling and Analytic sampling. With Monte Carlo sampling in the final image there is a certain amount of noise. However for high-dense meshes scenes it is a lot faster. Monte Carlo sampling: Min samples = 10, Max samples = 40, Threshold = 0.01. Tweaking these controls the amount of noise:

Quasi Monte Carlo sampling	Analytic sampling

The motion blur interval center

This example demonstrates the effect of the interval center parameter. The scene is a moving sphere. Here are three sequential frames without motion blur:

Here is the middle frame, rendered with motion blur and three different values for the interval center:

	Interval center = 0.0
	Interval center = 0.5
	Interval center = 1.0

The geometry samples

The geometry samples parameter is useful when motion-blurring complex motions, for example fast rotating objects. Here is an example with an accelerating airplane propeller:

Geometry samples = 2	Geometry samples = 3	Geometry samples = 6	Geometry samples = 10

Note that you can control the number of geometry samples on a per-object basis (from the Object properties dialog). This is useful if you need a lot of samples only for some objects in the scene (for example, the wheels of a car) while other objects (the car body) can do with fewer samples, thus saving memory and speeding rendering.

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