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A truly dark sky has a surface brightness of 2 × 10 −4 cd m −2 or 21.8 mag arcsec −2. [9] [clarification needed] The peak surface brightness of the central region of the Orion Nebula is about 17 Mag/arcsec 2 (about 14 milli nits) and the outer bluish glow has a peak surface brightness of 21.3 Mag/arcsec 2 (about 0.27 millinits). [10]
Scene rendered with RRV [1] (simple implementation of radiosity renderer based on OpenGL) 79th iteration The Cornell box, rendered with and without radiosity by BMRT. In 3D computer graphics, radiosity is an application of the finite element method to solving the rendering equation for scenes with surfaces that reflect light diffusely.
(of reflected light) directed, as from a smooth, polished surface (opposed to diffuse). A specular surface is a highly smooth surface. When the surface is very smooth, the reflected highlight is easy to see. As the surface becomes rougher, the reflected highlights gets broader and dimmer. This is a more "diffused" reflection. [1] [2]
When seen from below by a predator, the animal's light helps to match its brightness and colour to the sea surface above. Counter-illumination is a method of active camouflage seen in marine animals such as firefly squid and midshipman fish, and in military prototypes, producing light to match their backgrounds in both brightness and wavelength.
Specular highlights on a pair of spheres. A specular highlight is the bright spot of light that appears on shiny objects when illuminated (for example, see image on right). ). Specular highlights are important in 3D computer graphics, as they provide a strong visual cue for the shape of an object and its location with respect to light sources in the
An example of bloom in a computer-generated image (from Elephants Dream). The light on the bright background bleeds on the darker areas, such as the walls and the characters. An example of bloom in a picture taken with a camera. Note the blue fringe that is particularly noticeable along the right edge of the window.
Lighting artist: A video game artist who works on the light dynamics of a video game. Lighting artists adjust colours and brightness to add mood to the game. The lighting changes made in a video game depends on the type of game being created. The goal of the lighting artist is to create a mood that suits the scene and the game. [21] [35]
To the right is an image showing a simple example of a path of rays recursively generated from the camera (or eye) to the light source using the above algorithm. A diffuse surface reflects light in all directions. First, a ray is created at an eyepoint and traced through a pixel and into the scene, where it hits a diffuse surface.