Questions tagged [sampling]
The sampling tag has no summary.
93 questions
0 votes
0 answers
55 views
Handling probabilities with Spectral "Null Tracking"
I have confused myself to the point where i dont know what up or down are. I will try to keep things focused, but certain decisions may need a paragraph of motivation. For some time now me and a ...
- 121
0 votes
1 answer
237 views
Is jaggedness truly an "aliasing" effect?
In this note, I will argue that the jaggedness observed in rasterized images should not be referred to as aliasing. First, let us agree on a definition: aliasing is the distortion that arises when ...
1 vote
2 answers
99 views
Confusion about camera ray pdf
When I was studying a code base of path tracing implementation (done in GLSL), I notice the author returned a pdf of generated camera ray: ...
- 21
3 votes
1 answer
335 views
Lots of bad samples (below the hemisphere) when sampling the GGX VNDF
I've noticed that my implementation of GGX VNDF sampling produces quite a lot of bad samples (below the hemisphere). When such a sample occurs, I terminate the ray, leading to an immediate black pixel....
- 301
1 vote
1 answer
95 views
Measure (or Jacobian) conversion for direction sampling
If in the path tracing use case, I have some sampling strategies to sample a scattering direction in a 2D space ($\theta, \phi$). Of course, I need to convert it to a 3D direction vector (with length ...
- 1,462
0 votes
1 answer
297 views
Evaluating the Rendering Equation by hand (simple case)
I'm trying to make intuitive sense of the rendering equation and so I'm trying to work out a trivial example by hand, though ultimately I'm just trying to understand how monte carlo importance ...
- 319
1 vote
1 answer
367 views
Conditionally sample from texture in shader
I'm building a little 2D graphics library in Rust/WGPU as a means to learn graphics programming. I want to draw an outline around a shape and specify the outline's color. All of my shapes have a ...
- 157
2 votes
1 answer
175 views
White spots when rendering diffuse material with environment light
I am trying to implement a simple shader. A round ball object is rendered with uniform albedo and I noticed some strange white spots on the outputs. I perform importance sampling with 512 light ...
- 121