Join Dariush Derakhshani for an in-depth discussion in this video What is global illumination (GI) in V-Ray?, part of Learning V-Ray for Maya: A Professional Reference Guide.
In this video we'll be taking a look at what GI is inside V-Ray. We have a scene here that is enclosed in a sphere, which has a single light coming from the left. With direct lighting where there is no global illumination, you get a render that looks like this. The shadows in the enclosed areas are very dark and there is no detail seen within that black at all. GI, standing for Global Illumination, allows you to render a bounce light situation, where rays coming from the light source in the scene bounce around in the geometry, giving you a result such as this.
GI allows you have refractive and reflective caustics giving you a better reality of glass and other such materials, as well as giving you the ability to have colour bleed along with your materials. What GI allows you to do is to take the rays of light coming from your light source or light sources and allows you to bounce them inside enclosed areas where the direct rays won't reach.
These rays, once they bounce off of objects that are already colored, will pick up some of that colour and bleed on to more neutral surfaces, in view array GI is turned on through the Indirect Illumination tab by simply clicking on the object box. There are two different types of bounces for GI. The primary bounce calculation, and the secondary bounce calculation, and each has a set of different types of GI calculations available to them. What types of GI that you choose for either of the bounces will depend on the quality you need to achieve, as well as the movement and animation inside the scene.
With a (UNKNOWN) of options and settings GI can represent a little bit of confusion. However, in V-Ray, it's actually pretty easy to use. With a little bit of practice and trial and error, you'll be using GI effectively pretty quickly with V-Ray. So, in this video we took a look at what GI is in VRAM /g.
- What is V-Ray?
- V-Ray integration with Maya UI
- V-Ray lights and shaders
- Working with global illumination
- Object properties and render layers
- Creating passes and elements
- Rendering and optimizing
Skill Level Beginner
Maya Rendering for After Effects Compositeswith Lee Lanier3h 9m Intermediate
Photorealistic Lighting with Maya and Nukewith Mark Lefitz2h 24m Intermediate
1. Getting Started with V-Ray
What is V-Ray?2m 50s
2. V-Ray Lights
3. V-Ray Shaders
4. GI Methodology
5. V-Ray Object Properties and Render Layers
6. V-Ray Render Elements
7. Rendering and Optimizing
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