RAY TRACING PROJECT Jian CHEN 103000

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RAY TRACING PROJECT Jian CHEN 10/30/00

• Basic Ray Tracing
• Shading
• Shading Highlight
• Shading Highlight Shadow
• Multi-lights

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Basic Ray Tracing
eye
rays
Screen
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Basic Ray Tracing

• Select Eye position at e
• Sphere (x-a)2(y-b)2(z-c)2R2
• Screen at (x, y, z) (xminltxltxmax,
  yminltyltymax,zz)
• Ray Function
• Xex(x-ex)texdxt
• Yey(y-ey)teydyt
• Zez(z-ez)tezdzt
• Intersections with the sphere
• Adxdxdydydzdz
• B2dx(ex - a) dy(ey - b) dz(ez- c)
• C(ex- a)2 (ey - b)2 (ez - c)2 - R2
• DeltaB2-4AC

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Basic Ray Tracing
Resolution is 100100(L), and 200200(R)
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Shading Specular reflection

• Add a light at L
• Calculate each pixels I
• IIaKafattIp(Kd(NL)Ks(RV)n)
• Ia intensity of the ambient light
• Kaambient-reflection coefficient
• Ipintensity of the point light source
• Kddiffuse_reflection coefficient
• Ksspecular-reflection coefficient
• fattenergy falls off from L to the point

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Shadin Highlight
Simple shading(L), plus hightlight (R)
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Shadow Multi-lights

• Light i at Li
• At each intersection points, get I
• IiSiFattiIpiKdi(NLi)Ksi(RiV)n
• IIaKasum(Ii)
• Si0, if light i is blocked at this point
• Si1, if light i is not blocked at this point

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Final
200200
200200
Add one point light (L), two point lights(R)
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10001000
10001000
The source code and images can be get at
www.caip.rutgers.edu/jianc/course/ece560/project