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Light Sources in Computer Graphics: Types and Simulations

Learn about different light sources in computer graphics, like Directional, Point Light, and Spotlight. Understand how they work and simulate parallel rays for realistic rendering.

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Light Sources in Computer Graphics: Types and Simulations

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  1. Simple Light Sources CSE 681

  2. Types • Directional • All light rays have the same direction • Simulates parallel rays of sun • Point Light Source • Light originates from specific point in world space • Light ray has to be formed from object point to light source point • Spotlight • Point light source with direction of greatest intensity • Optionally has hood outside of which no light is emitted CSE 681

  3. Directional L Where L is constant for all objects in scene N L N CSE 681

  4. Point Light Source L L is formed for each illuminated point or face or object N N L CSE 681

  5. Spotlight (Warn model) Intensity of light falls off according to deviation from D q q L D Clamp to zero N Diffuse: N L N L Hood (optional) If cos(q) > -Li.D Ignore light N L CSE 681

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