Questions tagged [occlusion]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
63 views

What are applications of 3D geometry to 2D geometry projection and occlusion handling?

As a layperson in the field of computer graphics, I rarely see practical applications of algorithms that take 3D geometry as the input (along with some camera and lighting parameters) and output the ...
Max Flow's user avatar
  • 103
0 votes
1 answer
74 views

How to implement falloff control in brute force ambient occlusion?

My AO algorithm is as follows, whith the random vectors just all over the hemisphere: ...
mrmanet's user avatar
0 votes
0 answers
441 views

How to sprite cast in a raycasting engine?

I'm trying to render sprites/textures in my raycasting engine, but I don't quite understand the math behind drawing the columns of the texture I intend to project. I've tried looking at several ...
Joshua Crotts's user avatar
2 votes
1 answer
331 views

A solution to sprite visibility in a raycasting engine with variable wall heights?

I am writing a raycasting engine. At this point, I have added sprites, and I am using a z-buffer, with one stored length to a wall for the x coordinate of each ray. Below is an image of a sprite which ...
Caspian Ahlberg's user avatar
1 vote
2 answers
117 views

Techniques for rendering high polycount models

I would like to know what common techniques are used for rendering large models, when using rasterisation within a graphics API, for example OpenGL or Vulkan. For example if I had a model with >10 ...
tester's user avatar
  • 113
3 votes
1 answer
664 views

How to deal with light leaks?

I'm struggling with light leaking through meshes (especially thin ones) due to interpolation between probes located on the opposite sides of those. First approach I took was mapping all static ...
Pavlo Muratov's user avatar
10 votes
1 answer
288 views

Sphere intersection occlusion (for hybrid raytracing)

Thinking about hybrid raytracing, hence the following question: Suppose I have two solid spheres $s_1$ and $s_2$. We know their centres and radii, and we know that they have some overlapping volume ...
occulus's user avatar
  • 203
11 votes
2 answers
642 views

With modern fillrates and deferred rendering, is occlussion culling still relevant?

For example, while it's the current top-of-the-line GPU, the GTX 980 has a staggering 72.1 gigapixels/second fillrate, which with back-to-front rendering and/or Z buffer checks, seems almost ...
Llamageddon's user avatar
5 votes
1 answer
225 views

How can I get a spherical visibility mask map for a point on a concave surface?

I encountered this problem doing my project. Suppose there is a 3D mesh model, e.g. a human face, I need the 3D visibility map at each of the vertices of this model. By the "3D visibility map", I mean ...
user1692's user avatar
8 votes
1 answer
5k views

What is occlusion?

Occlusion "is the effect of one object in a 3-D space blocking another object from view." With this definiton in mind I cannot understand sentences like: The interior of a tube is typically more ...
Joey's user avatar
  • 627