Motion Blur for Lights and Cameras
Motion blur is now available in 3ds max 7 for lights and cameras in the mental ray Renderer. Animate the position or rotation of a camera or light and the moving image blurs. The blur from a light is seen in the shadows cast by the objects in the scene.To properly render moving shadows, follow these steps:
| 1. | First, make sure to uncheck (disable) Enable for Shadow Maps (Render Scene > Shadows & Displacement > Shadow Maps), or you will get unusable results. Without motion blur, a moving light illuminating an object generates a crisp, hard-edged shadow (Figure 5.14).Figure 5.14. The Deviled Egg rendered with Shadow Maps disabled. The resulting shadow is crisp, not blocky.
 | | 2. | Now add motion blur. In the Render Scene dialog, under the Render tab, open the Camera Effects rollout and check Motion Blur. | | 3. | Enable the new Blur All Objects option under Motion Blur. This automatically affects the blur property of all objects, including lights and cameras. By checking Blur All Objects, you avoid having to manually set the property of each object, so you save timepotentially a whole lot of time, depending on the complexity of your scene (Figure 5.15).Figure 5.15. Motion Blur is enabled and will blur all objects in the scene.
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With these settings, when you animate a light, its shadow will blur. That blur will be greater the further the shadow is from the source light (Figure 5.16).Figure 5.16. The shadow cast from the character's feet is sharper than the shadow cast from higher up on its body. Since the motion blur of the shadow is moving horizontally with the movement of the light, the arms blur horizontally as well.
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