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Questions tagged [artifacts]

The tag has no usage guidance.

1
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1answer
39 views

Ghosting in volumetric lighting

Does anyone know any method to remove ghosting in volumetric lighting? When light move it leaves trail behind, i would like to remove it. Volumetrics are Bart Wronski style (in frustum) with ...
1
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0answers
139 views

Normal Artifacts On Grazing Angles

I am currently experiencing a very obvious artifact that occurs when looking at objects on very grazing angles Here is a picture of the artifact: I noticed that the issue was coming from my ...
2
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1answer
75 views

How to solve Z buffer artifacts

I am currently rendering a scene in the most standard fashion possible (triangle projection and Blinn-Phong for shading) However I am getting some artifacts: As you can see the lion head is not ...
0
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0answers
88 views

Spherical harmonics ringing after coefficient scaling

I have a light probe system which gathers lighting information in a form of spherical harmonics. What I do is project surrounding static geometry surface colors (without lighting) onto SH. Then, in ...
1
vote
1answer
42 views

What remedies are there for percieved color artifacts due to pixel geometry?

I have a white line on black background. Because of the pixel geometry the line does not look really white; one edge looks red-isch, the other blue-isch. Other fore- and background yield other ...
3
votes
1answer
141 views

What might be causing these artifacts in 5D & 6D simplex noise?

I've been working on writing functions for 5 and 6 dimensional simplex noise, working off FastNoise's 4D function as a base. 2D, 3D and 4D noise all follow a very similar and recognizable pattern ...
1
vote
1answer
76 views

Ringlike artifacts produced by rays bouncing off a light source

I recently set up a (very basic) ray-marched path-tracer, and I'm getting strange surface patterns on my area light [link]. I'm using known-valid analytical normals for the light's surface, and the ...
6
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0answers
139 views

Avoiding Mach band effect when using multiple lights

I wrote a simple Phong shader with two directional lights for a project, and noticed an unpleasant artifact in the lighting. Where both lights are illuminating the same region, dark bands appear at ...
5
votes
1answer
130 views

Tesselation sine distortion?

I am experimenting on a simple wave tessellation shader. I ported it from a working vertex shader. When my frequency is higher than 1, I get strange "saw-tooth" artifacting at peaks of the wave. Here ...
6
votes
1answer
474 views

Ray Tracing Shadows: The Shadow Line Artifact

By using smooth shading (i.e. interpolation of normals), an object can have a smooth look despite low polygon count. A nasty artifact that can happen when casting shadow rays is the Shadow Line ...
2
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0answers
50 views

Vectorizing half tone images

Vectorizing continuous tone images is often met with color palette reduction and visual artifacts. Half-tone images, on the hand, have constant patterns in their tones, which would intuitively lead to ...
6
votes
1answer
215 views

Artifacts when gamma correcting

Doing post-process gamma correction is showing texture artifacts, here is a small example on a skybox: The first image is gamma correcting on the skybox shader and seems correct, the lower is doing ...
1
vote
1answer
54 views

Compression-friendly PNG files

How to create PNG files optimized for being compression-friendly? I.e. would it help if image is created (mostly) from 8x8 unicolor blocks?
5
votes
1answer
169 views

Weird rendering in rectangle mesh shader AKA Why has my basic shader become a modern art generator?

I am trying to translate an old (2013) bit of code from Apple from objective C to Swift with some modifications I need for my simulation. The code I am translating can be found here To make ...
21
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1answer
2k views

Why does my Perlin Noise look “blocky”?

I tried to implement Perlin Noise by myself using just the theory (following flafla2.github.io/2014/08/09/perlinnoise.html). Unfortunately I was unable to achieve the look of the "original" Perlin ...
7
votes
2answers
315 views

Moires patterns despite using mipmaps

I am working on Silverlight app. I am trying to render floor covered with tiles. Although I am using mip maps I am still getting awful Moire patterns, when trying to render big area. What I am doing ...
5
votes
1answer
329 views

Texture glitch when using simple pixel shader

I have an issue with rendering my textures in Silverlight. When I look at it from above everything looks fine: But if I only change angle of watching it it looks terrible: I am using very simple ...
10
votes
1answer
147 views

When creating a JPEG, how can I minimize the occurence of artifacts?

There are 2 main factors that seem to lead to digital artifacts when creating JPEG images: Aliasing and Compression. Example: Converting a PNG with characters on it to a JPEG or placing vector ...