Rendering with the Default Settings
The Default Options in V-Ray for SketchUp are set up so that certain elements of V-Ray are already enabled. This is good because certain aspects that are specific to V-Ray are already configured with a proper setting. However there are a number of elements which are contributing to the final render, and it is important to know what they are so that unwanted results are avoided when we start adjusting the render options ourselves.Key Elements in the Default Settings
There are three main elements specific to V-Ray that are creating some of the aspects of the default render. These elements are Indirect Illumination, the V-Ray Sun and Sky, and the V-Ray Physical Camera. These elements will be explained very briefly here, and you can reference other chapters in the book for a detailed explanation of these elements.
Indirect Illumination is simply light that does not come directly from a single light source. In V-Ray this typically references two types of light; Global I l l u m i n a t i o n a n d B o u n c e d l i g h t . G l o b a l Illumination is simply a dome of light that is emitted around the scene, and this can make setting up lighting very quick and easy. Bounced light is simply the light energy that is bounced from a surface. This bounced light is what allows V-Ray to create high-quality renderings. For a more in depth explanation of Indirect Illumination please refer to page 66.
The V-Ray Sun and Sky is physically accurate lighting model allowing for easy recreation of the effects of the Sun and Sky. This is an excellent tool for setting up exterior renderings with a sun. Due to the nature of the model in which the sun and sky are based off of, you will find that under standard conditions the sun and sky will be extremely bright. Because of this the V-Ray Physical Camera is used to expose the scene and brings the rendered image to a desirable level.
The V-Ray Physical Camera is modeled after a real-world camera and can be used to expose a scene. In the real world, lighting is different in many situations, and because of this a photographer will use the capabilities of the camera to properly expose the image. Proper exposure means that the image is not overly bright or too dark. When creating renderings this gives us the opportunity to set our lighting as it would be in the real world (in this case it is the Sun and Sky) and adjust our camera settings until we achieve the desired result.
The detailed explanations of the Sun and Sky and the physical camera are on page 79 and 82.
