Without the ambient light added into the render, it would appear uniformly black. For example, the lamp's housing appears completely uniform. Areas that lie outside of the ceiling lamp's direct light lack definition. Rendering with local illumination (with Raytracing). !(img/maya/rendering/gl/Local_illumination.JPG) # Comparison between direct (local) and indirect (global) illumination
Mental Ray for Maya allows interactive and batch Mental Ray rendering from within the Maya user interface. **Mental Ray for Maya** offers all the features traditionally expected of **photorealistic rendering** and includes functionality not found in most rendering software. To use Global Illumination in Maya, you must use the Mental Ray renderer. The lack of light in these areas creates a type of shadowing known as **ambient occlusion**.Ĭolor bleeding is a global illumination effect where reflected light projects some of the object’s diffusely (as opposed to specularly or glossily) reflected color onto a nearby surface.įor example, a bright red apple on a pure white table cloth ‘spills’ red onto the table cloth. Image from ()Īs light rays bounce around in an environment, fewer light rays reach the parts that are hidden in corners, cracks, and crevices.
Perhaps **80 percent of the illumination** in an environment is contributed by indirect (global) illumination, and simulating its effect is critical to creating realistic rendering. Bounced light rays are **indirect illumination**.
If the light ray is reflected, it reenters the environment and continues to bounce off reflected surfaces until it is absorbed by another surface. In reality, when a ray of light hits an opaque surface, it is **either absorbed or reflected (or a little of both) by the surface**. Understanding concepts, differences, and uses of Global Illumination (GI), Final Gather (FG), and Caustics, and their application, often for a more photorealistic scene.
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