Raytracing

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How do we get shadows?What is different about the lightcomputation to get shadows?CSE 472 Spring 20137Shadow FeelersBefore we compute the colorcontribution for a light, shoot a ray inthe light direction.Does it hitanything?Called a:“Shadow Feeler”CSE 472 Spring 20138
Computing Ray Color// Compute the color for a raycolor RayColor(ray)Test ray for intersectionIf(intersection)Determine for intersection:intersection point, normal, material, texture colorcolor = compute-ambient-colorforeach lightif shadowfeeler does not hit anythingcolor += compute-diffuse-color-from-lightcolor += compuer-specular-color-from-lightreturn colorelsereturn background-colorCSE 472 Spring 20139But, be careful or you get:CSE 472 Spring 2013Stipple!10
Page 6 and 7: Problems w/ numerical precisionCSE
Page 8 and 9: Intersect Functionbool Intersect(co
Page 10 and 11: Aliasing, aka “Jaggies”Why does
Page 12 and 13: Characteristics of the Human EyeRec
Page 14 and 15: Instead of one raythough the center
Page 16 and 17: uniform random numbersFirst idea is
Page 18 and 19: Poisson Distributions10.90.810.90.8
Page 20 and 21: Poisson is French for “Fish”CSE
Page 22 and 23: 4x AntialiasingCSE 472 Spring 20134
Page 24 and 25: Next?CSE 472 Spring 201347Reflectio
Page 26 and 27: Recursion issuesDon’t recurse if
Page 28 and 29: How do we solve this problem?All to
Page 30 and 31: RayColor with PenumbraCPoisson2D po
Page 32 and 33: Putting it all togetherWe have thre
Page 34 and 35: Stochastic Ray TracingProblem with
Page 36 and 37: Photon map•Photon by light-based

Raytracing

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