(c) [0x1] Software & Consulting GmbH, 2017 | Version 2.0 | November 16th 2017

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6.2.5 Motion Blur attributes

To calculate motion blur, Iray chooses a time, "moves" the scene to that time, and renders a certain amount of iterations before going on with the next time sample.

Iray Common Motion Blur UI

Enable Motion Blur

Turns the motion blur calculation on or off.

Steps per Frame

Defines the accuracy of the interpolation between transformations of an object per frame. This value defines how precise the animation curve is approximated for Motion Blur rendering. This attribute can be overwritten on a per object base using the according attribute in the [Attribute Editor ➤ Iray] section of each transform node.

Rotation Interpolation

Choose the interpretation for the calculation between rotation values. This attribute can be overwritten on a per object base using the according attribute in the [Attribute Editor ➤ Iray] section of each transform node.

Rotation Value

Interpolates the rotation values themselves.

Spherical

Uses the minimal rotation path to get to the position of the next time step.

Note:

Consider a full 360 degrees rotation, where the angle is 0 at the starting time step and 360 at the next one. Choosing Spherical will result in the minimal rotation between both angles and thus there won' be any motion blur due to rotation. In order to get the desired complete rotation, Rotation Value interpolation has to be chosen. Note that the considered time steps depend on the Steps per Frame attribute.

Samples per Motion Sample

Number of iterations rendered before the scene is updated to a different time value. You can adjust the number of iterations for each time sample. If the simulation complexity originates more from the illumination then motion increase this parameter, otherwise, i.e. motion is more difficult than illumination, lower this parameter. Note that the actually number of iterations per motion sample is a power of 2, i.e. increasing by one means doubling the iterations.