3D Graphics & Rendering in Computer Graphics

3D Graphics & Rendering in Computer Graphics

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  3D Graphics &Rendering By Faraz Akhtar C12008 CSE 5th Semester Delhi College of Technology & Management
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  Introduction to 3dComputer Graphics  3D computer graphics is the science, study, and method of projecting a mathematical representation of 3D objects onto a 2D image using visual tricks such as perspective and shading to simulate the eye's perception of those objects.
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  3D Graphics andPhysics  3D graphic software is largely based on simulating physical interactions.  Generally:  Space relations.  Light interactions.  In particular cases:  Material properties.  Object Movement.
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  Goals of 3Dcomputers graphics  Practical goal: Visualization - to generate images (usually of recognizable subjects) that are useful in some way.  Ideal goal: Photorealism - to produce images indistinguishable from photographs.
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  Components of a3D Graphic System  3D Modeling:  A way to describe the 3D world or scene, which is composed of mathematical representations of 3D objects called models.  3D Rendering:  A mechanism responsible for producing a 2D image from 3D models.
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  3D Modeling  Simple3D objects can be modeled using mathematical equations operating in the 3-dimensional Cartesian coordinate system.  Example: the equation x2 + y2 + z2 = r2 is a model of a perfect sphere with radius r.
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  Modeling considerations  Puremathematical equations to represent 3D objects requires a great deal of computing power  Impractical for real-time applications such as games or interactive simulations.
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  3D Rendering  Theprocess of taking the mathematical model of the world and producing the output image.  The core of the rendering process involves projecting the 3D models onto a 2D image plane.
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  Illumination for scan-line renderers Lighting and shading is calculated using the normal vector.  The color is linearly interpolated across the polygon surface.