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identify a sphere along with a light source above it; hence its lower half will not be illuminated. In practice in a actual scene this lower half would be partially illuminated through light which had been reflected from the other objects. This consequence is approximated in a local illumination model via adding a term to estimate this general light such is 'bouncing' around the scene. This term is termed as the ambient reflection term and is modeled through a constant term. Again the amount of ambient light reflected is dependent upon the properties of the surface. This is to be noticed that if Ia → intensity of ambient light; Ka → property of material as Ambient reflection coefficient ka , 0 < ka < 1 then consequential reflected light is a constant for all surfaces individual of viewing direction and spatial orientation of surface.
As like:
Ia → Intensity of ambient light.
I → Intensity of reflected ambient light
This is assumed here Ia ≠ 0 (Q Ia = 0 ⇒ such does not exit any light)
I a Ia ⇒ I = Ka Ia;
Ka → constant; 0 ≤ Ka ≤ 1
Ka = 0 ⇒ object has absorbed the entire incident light. Ka = 1 ⇒ object has reflected the entire incident light.
0 ≤Ka ≤1 ⇒ object has reflected several and absorbed light.
De Casteljau Algorithm For computation of Bézier curves an iterative algorithm known as de Casteljau algorithm is used. The algorithm uses repeated linear interpolation.
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