Autodesk 12812-051462-9011 User Guide 3 - Page 1032

Motion Blur group TIP mental ray motion blur is not recommended for use with particle systems, as this can increase rendering time considerably. Use a Particle MBlur map on page 5891 instead. NOTE Motion blur with the mental ray renderer does not always follow curving trajectories. Increasing the value of Motion Segments can help, but this works better for rotary motion than for traveling motion. The Rendering Control Properties (lower-right) quad of the rendering quad menu (Ctrl+Alt+right-click) has a Motion Blur toggle for a single, selected object. You can turn on Motion Blur for lights and cameras: moving lights and cameras can generate motion blur when rendered with mental ray. Enable When on, the mental ray renderer calculates motion blur on page 6248. Default=off. Blur All Objects Applies motion blur to all objects, regardless of their object property setting. Default=on. Shutter Duration (frames) Simulates the shutter speed of a camera. At 0.0, there is no motion blurring. The greater the Shutter Duration value, the greater the blurring. Default=0.5. Shutter Offset (frames) Sets the beginning of the motion-blur effect relative to the current frame. The default value, 0.0, centers the blurring around the current frame for a photorealistic effect. Default=-0.25. Motion Segments Sets the number of segments for calculating motion blur. This control is for animations. If motion blur appears to be tangential to the actual motion of an object, increase the Motion Segments value. Larger values result in more accurate motion blur, at a cost of rendering time. Default=1. Time Samples When the scene uses motion blur, controls the number of times the material is shaded during each time interval (set by Shutter Duration on page 6287). Range=0 to 100. Default=5. By default, the material is shaded only once, and then blurred. If the material changes rapidly during the shutter interval, it might be useful to increase this value, in order to obtain more accurate motion blur. Rapid changes in reflections or refractions might require a higher Time Samples value. mental ray Renderer | 6287