Computer Graphics · Unit 8 · 5 hrs
Illumination Models and Surface Rendering Techniques
Exam-focused notes for Illumination Models and Surface Rendering Techniques (Computer Graphics, CSC214): what the TU syllabus asks and how it has actually been tested, with 6 solved past questions from this unit.
What this unit covers
- Basic Illumination Models: Ambient light, Diffuse reflection, Specular reflection and Phong model
- Intensity attenuation and Color consideration, Transparency, Shadows
- Polygon Rendering Methods: Constant intensity shading, Gouraud shading, Phong Shading and Fast Phong Shading
Basic Illumination Models
Describe any two basic illumination models. [5]
An illumination model (also called a shading model) is a mathematical model used to determine the color or intensity calculation of a single pixel at a particular point on a surface. The color seen at a particular point depends on various optical parameters...
Full solved answer →Polygon Rendering Methods
How a realistic image can be generated in computer graphics? Explain fast phong shading. [5]
A realistic image in computer graphics is produced by combining several techniques that simulate how light interacts with surfaces in the real world. The key steps and methods involved are: Objects are represented using polygon meshes (triangle strips, quad...
Full solved answer →Define the term 'rendering' in computer graphics. Explain Phong Shading Method with its advantage and disadvantage. [5]
--- Rendering is the process of generating a final 2D image from a 3D scene description by applying lighting, shading, color, and other visual effects to the geometric objects in the scene. It transforms a mathematical model of a scene into a realistic or s...
Full solved answer →Define intensity attenuation. Distinguish between Gouraud shading and Phong shading model. [5]
--- Definition: The rate of decrease in intensity with respect to the distance between the light source and objects is called intensity attenuation. - If a point light source is used, the intensity attenuation is given by: $$\text{Attenuation} = \frac{1}{d^...
Full solved answer →Define realism in human perception. What is the significance difference between rendering and image synthesis in creating computer generated 3D image? Describe any two polygon rendering methods.[10]
--- Realism in human perception refers to the ability of a computer-generated image to appear as close to the real world as possible, so that the human visual system perceives it as natural and believable. In computer graphics, realism is achieved by simula...
Full solved answer →Intensity attenuation and Color consideration, Transparency, Shadows
How can we detect shadows in computer graphics? List the challenged in computing light model. [5]
--- Shadows help create realism in a scene. They allow humans to distinguish movement and depth of objects more clearly. Several techniques are used to create and detect shadows: - A shadow volume is a 3D region of space that is in shadow. - The geometry of...
Full solved answer →Make Unit 8 stick
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