Raytracing

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Stochastic Ray TracingProblem with ray tracing:Point samplingWe can introduce randomnessall over the place• Jitter for antialiasing• Light area for penumbra• Depth of field and motion blur[Jensen07]CSE 472 Spring 201367Path Tracing1) Sample each pixel with N rays2) At each intersection, trace only one rayproportion of rays in each categoryshould match the actual (surface) distributionRay TracingPath TracingReduces the amount of work deeper in the ray treeCSE 472 Spring 201368
Adaptive samplingDetermine if number of samples isenough• If not, increase the numberWorks for uniform and stochasticsamplingCSE 472 Spring 201369Ray tracing from the light sourcesIn regular ray tracing we don’t see• Lighting reflected through mirrors• Surfaces lit by reflection from other surfacesLarge set of rays from each light• Computes light that hits surfaces• General solution for diffuse reflection?• Still requires tracing from the eye as pass 2CSE 472 Spring 201370
Page 4 and 5: How do we get shadows?What is diffe
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 36 and 37: Photon map•Photon by light-based

Raytracing

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