Lecture 13: Global Illumination & Path Tracing (109)
JefferyYC
Why do we have zero probability of matching the exact direction of a point light? What does the exact direction mean, since I thought point light emits light in uniform spheres?
thecatherinehuang
When sampling over a continuous density function, the probability of picking any specific point is 0 even if the density is positive.
For example, if I have X∼Unif[0,1], the probability that I pick the point 0.041423 is 0 because I could have chosen 0.0414231 or 0.04142314.
Why do we have zero probability of matching the exact direction of a point light? What does the exact direction mean, since I thought point light emits light in uniform spheres?
When sampling over a continuous density function, the probability of picking any specific point is 0 even if the density is positive.
For example, if I have X∼Unif[0,1], the probability that I pick the point 0.041423 is 0 because I could have chosen 0.0414231 or 0.04142314.