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Lecture computer graphics and virtual reality slides lesson 10 illuminiation and shading

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Tiêu đề Illumination and Shading
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Trang 4 How lights can be seen?■ The eye works like a camera■ Lots of photo sensors at the back of the eye■ Sensing the amount of light coming from different directions■ Similar to CMOS

Lesson 10 Illuminiation and shading Content Overview Illumination Shading Overview How lights can be seen? ■ The eye works like a camera ■ Lots of photo sensors at the back of the eye ■ Sensing the amount of light coming from different directions ■ Similar to CMOS and CCDs Information will be sent to brain for processing What colour is this dress? Object’s colour ■ What Affects the Color of a Point on the Object? □ position of the sample point □ position of the light □ color and intensity of the light □ camera vector □ normal vector of the surface at the vertex □ physical characteristics of the object (reflectance model, color) Colour’s illusion Lighting and shading ■ Lighting □ How to compute the color of objects according to the position of the light, normal vector and camera position ■ Shading □ Different methods to compute the color of the entire surface Lighting Factors affecting lighting Light source Surface properties

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