CS552: Computer Graphics Lecture 35: Rendering. Recap Illumination Model o Light Source and surface o Effect of multiple light source o Colored lights.

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Presentation transcript:

CS552: Computer Graphics Lecture 35: Rendering

Recap Illumination Model o Light Source and surface o Effect of multiple light source o Colored lights and surface o Effect of atmosphere o Refraction

Objective After completing this lecture, students will be able to o Apply different shading method for rendering

Atmospheric Attenuation Depth-cue color Previously computed color Scale factor Depth cueing

Shading Models for Polygon We can shade any surface by o Calculating the surface normal at each visible point o Applying the desired illumination model at that point. This approach is computationally expensive There are efficient techniques to achieve the desired effect

Constant Shading

Gouraud Surface Rendering Also referred to as intensity-interpolation surface rendering

Illumination interpolation

Incremental approach

Illustration

Phong Surface Rendering A more accurate interpolation method for rendering a polygon mesh Normal-vector interpolation rendering o Interpolates normal vectors instead of intensity values

Illustration

Illustrations

Thank you Next Lecture: Rendering