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Technology

Published on March 10, 2014

Author: meheng1001

Source: slideshare.net

Description

www.topcadservices.com PRESENT Informative about Radiosity in 3D and CAD Radiosity is an application of the finite element method to solving the rendering equation for scenes(CAD and 3D) with surfaces that reflect light diffusely. Radiosity is a global illumination algorithm in the sense that the illumination arriving at the eye comes not just from the light sources, but all the scene surfaces interacting with each other as well. Also radiosity is a method of rendering based on detailed analysis of light reflections off diffuse 3D surfaces. It calculates diffuse reflections of color and light from all surfaces in a scene. Calculatiing it divides each surface into small pieces, called patches. Each patch is calculated individually for the amount of light that enters or leaves that surface. The program then solves the system of equations in the model by determining the quantity of light on each patch as a result of the total sum of all the patches. Radiosity calculations are viewpoint independent which increases the computations involved, but makes them useful for all viewpoints. Visit us: www.topcadservices.com

The images that result from a radiosity renderer are characterized by soft gradual shadows. Typically is used to render images of the of inside space interior. Therefore can achieve extremely photo-realistic results for scenes that are comprised of diffuse reflecting surfaces. In a way, radiosity makes 3D lights behave like real world rays – with all the pros and cons that comes with them. Here some advantages of radiosity that are used in GI while is rendering: -Spread color “energy” throughout the scene until a stasis point is reached; -Only handles diffuse reflection, no specular reflections; -Large memory consumption; -Very realistic soft illumination images can be produced. Radiosity as a rendering technique can give some remarkable results. That is enabled of the phenomenon of specular reflection. So it aloud to display the highlight at different points even when objects are viewed from different angles. This is because shiny surfaces reflect light unequally in different directions, on a perfectly shiny surface light is reflected only in the direction of the reflected ray. So radiosity enabled the light to arrived directly and indirectly from the environment at each surface point and uses this as the point of

illumination.The elegance of this approach is that it produces all of the effects of the real object's appearance illuminated by the light of the environment, including self-shadowing, and it can be applied to any material, from metal to plastic or glass. Rendered model using combination of radiosity and ray tracing Visit us: www.topcadservices.com But, there is adisadvantage of radiosity. This disadvantage of radiosity it applies to matte and diffuse surfaces only, so contributions from

translucent, transparent, and specular (shiny) surfaces are not included in the calculation. Therefore almost always is used in combination with ray tracing. Read all post at: http://www.topcadservices.com/2014/informative- global-illumination-in-cad-and-3d/#ixzz2vFtZne8t Mechanical Engineer Kuzmanovski Zoran

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