To create more realism for a 3D scene, you’ll want to add motion blur to it based on the movement of your 3D camera. This can be done in two ways:
• Adjust the samples value in the ScanlineRender node’s parameters. The image is sampled multiple times over the shutter period. This way is the most accurate, but also the slowest, because the full rendering calculation is done multiple times for each pixel. See Adding Motion Blur Using ScanlineRender.
• Use the VectorBlur node to generate motion blur based on motion vectors. This way is faster to render, as it is only affected by the pixel resolution of the final image rather than the complexity of your 3D scene. See Adding Motion Blur Using VectorBlur.