In the real world, light will bounce from one surface to another and will continue to bounce until all the energy is absorbed. Depending on the light type, intensity and distance, combined with the surface properties the amount of illumination for each ray hit is calculated. Without GI, the only light that is calculated is from the rays that bounce from the surface of the model. When a light is evaluated, the render engine will fire rays from either the camera or the lights, these rays will travel into your scene and bounce off the surfaces of your models. The following is a simplified explanation and not all renderers work the same, but hopefully this helps explain the general principle behind Global Illumination (GI). Global Illumination and Radiosity are the terms used to describe the process of calculating indirect lighting. Global Illumination, Dome Lights and HDRIs? This will help calculations such as light falloff and shadows to be more physically correct.Ģ. Using real world scale for your scenes will help with lighting as you can accurately size and position lights based on real objects. The preview scene is set to use cm for project scale, and the sculpture of the Bears, is 1.5 metres high. These materials are the same for each render, so that gives us a base for comparison We used two simple Redshift grey materials, one slightly rougher and darker for the floor and lighter grey material for the model. We used a 3D scan of two bears, sculpted by Hanna Gärtner, which was downloaded from My Mini Factory website which is an amazing resource for scans from all around the world and these models are excellent for practising lighting and shading in 3D as well as for printing. you should be able to adapt these principles to your package. Most, if not all of these techniques can be applied to virtually any modern renderer, it doesn’t matter if you use Redshift, Octane, Arnold, Corona, Vray, etc. Since then, the landscape has changed considerably and we have many more render engines to choose from, they are generally faster and offer more features that Physical, which is now outdated.įor this tutorial we decided to use Redshift, but the intention is to be as generic as possible. This tutorial was originally published in 2015 and the main renderer focused on was the Cinema 4D Physical Renderer. In this tutorial, Tim shares ten tips which explore basic lighting concepts and how we can implement these in our CG set ups.
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