Questions tagged [sampling]
87 questions
9
votes
2 answers
Mitchell's Best Candidate Algorithm
I'm trying to generate an image where black dots are arranged in a blue noise distribution on a white background.
I know that there are other ways to do this, one of the best being "Fast Capacity Constrained Voronoi Tessellation." [Hongwei 09], but…
Alan Wolfe
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9
votes
1 answer
Link between blue noise sampling and blue noise textures?
You can have blue noise sampling like these poisson disc samples:
And you can have a blue noise texture like this:
I get that in the first image, there is one input (the index of the sample) and two outputs (the x,y coordinate of the point) and…
Alan Wolfe
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- 76
2
votes
1 answer
Upscaling 720p to 1080p vs upscaling 768p to 1080p
Suppose I can run some graphics in 1366x768 equally well as 1280x720, and I have a 1920x1080 monitor.
There are more pixels in 1366x768 than in 1280x720. However, in 1280x720, a 2x2 grid of pixels fits exactly within a 3x3 grid of physical pixels…
keej
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vote
1 answer
Calculate BRDF and PDF when doing direct light sampling
I learned in PBRT that to sample direct lighting for a surface a integrator usually calculates the sample as
$$
Sample = \frac{L_d(p,\omega_r) f(p,\omega_o,\omega_r)|cos\theta_i|}{p(\omega_r)}
$$
where BRDF $f(p,\omega_o,\omega_r)$ is the sum of…
swfly
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1
vote
1 answer
Reconstruction filter of LCD monitor
I'm very confused about sampling and reconstruction of images.
I read that in the framebuffer there is a sampled representation of an image, for visualization the sampled representation is converted into a continuous one by the video hardware.
Which…
Valerio
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