Questions tagged [fragment-shader]
The fragment-shader tag has no usage guidance.
60
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Why is the z coordinate simply set to 1 for setting up direction of a ray in ray marching
I’ve recently gotten into shader art , using sites like shadertoy and various tutorials for getting started.
One thing I noticed is that a typical setup involves ray marching whereby:
We set a ...
- 133
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59
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Pixilate/Quantize UV coordinates in world space?
The effect I'm trying to achieve is to have it so that the texture is pixilated/quantized, but the "grid," stays aligned to world coordinates even as the object with it's own UV coordinates ...
- 101
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How are multisample samples partitioned in OpenGL, and at which points does interpolation take place?
As I understand it, with glEnable(GL_MULTISAMPLE), glEnable(GL_SAMPLE_SHADING) and ...
- 193
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Are stencil buffer dimensions required to match render target dimensions?
I may not need as precise pixel-perfect stenciling as my render target during stencil tested render pass. I could be okay with stencil test happening at half or quarter of resolution to save bandwidth,...
- 115
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Is it possible to fill in Stencil Buffer programmatically via fragment shader?
I've never worked with stencil buffers, but I'm researching if it is the right tool for my task.
Basically I don't understand yet if stencil buffer can only be filled in by some hardcoded rules during ...
- 115
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77
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How to avoid declaring sampler outside of statement?
How can I avoid having to declare the sampler outside of the if statement in this shader code sample?
...
- 125
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53
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How to interpolate alpha from CURRENT_ALPHA to TARGET_ALPHA for each pixel in shader language? (Godot/GLSL)
I want to make "trails" of objects on my shader that appear and disappear gradually.
I am getting pixels (for fragment shader) where objects are from uniform texture.
Basically, I have my ...
- 373
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2
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226
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Storing array of floats within shader
I am about to implement a framerate histogramm chart for a DirectX Renderer.
Ideally I would do this in pure shader code, but for a a histogramm I need to store the timestamps of the last ...
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How can I see the whole shader's text content, with all the prepended code by Three.js, when using ShaderMaterial or RawShaderMaterial (r148)?
I know that Three.js prepends the shader text you provide with some code that includes definitions etc. I am not a big fan of "magic" and I would like to be able to see the final text ...
1
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1
answer
319
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Undo barycentric interpolation
How do I undo the interpolation of vertex attributes? I'm using unity shader graph which doesn't support nointerpolation. I assume I need to store 3 float3 with one component of each float3 being 1 ...
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227
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What are the main concepts behind building the plasma effect with GSLS?
By the plasma effect I mean an animation that looks like this:
I have seen some codes, like these
https://www.shadertoy.com/view/Xst3zN
https://www.shadertoy.com/view/4tdGWX
and messed with the code ...
- 31
2
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1
answer
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efficient way to get min/max distance during rendering
I want to improve my shadow mapping depth precision by getting the minimum and maximum depth value within my shadow map. When having both values I would convert the depth map to convolution shadow map ...
- 1,299
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1k
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Tiling in GLSL creates unwanted seams
I'm writing a shader that creates a grid with coloured tiles. The color is derived from a pixel at that location on a texture. But around the tiles I get these unwanted seams.
I can't seem to figure ...
- 103
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OpenGL transparency - object behind is not rendered
I'm trying to implement voxel world using OpenGL (Core 3.3). I've come across a problem with transparency. It looks like sometimes GPU decides to not render stuff that would be important. Can you help ...
