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Questions tagged [raymarching]

38 questions
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Why are my Ray march fragment shader refelction texture lookups slowing my frame rate?

I’ve written a Fragment shader in GLSL, using shader toy. Link : https://www.shadertoy.com/view/wtGSzy most of it works, but when I enable texture lookups in the reflection function, the performance drops from 60FPS to 5~FPS. The code in question is…
Minty
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Collision detection between non-uniform signed distance fields?

Hi folks:) this is my first question and I hope this is not a too unspecific/broad question to answer to. I am very excited about Ray Marching (Sphere Tracing specifically) and the ability to render based on 'distance' between points and objects…
ich.
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Large-scale volume rendering and visualization libraries for terabyte-size data

I want to visualise 3D volumes of data that span between a few gigabytes to a few terabytes. One solution would be to roll my own but this may take some time. To avoid this I am currently exploring what are current available solutions. The more I…
AstrOne
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How to prevent artefacts on rotationg glsl raymarching surfaces

I am learning about raymarching in GLSL, and have drawn basic understanding from http://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm and various shaders on the ShaderToy website. I have created a shader where I use the signed…
DatHydroGuy
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Volume rendering is more transparent from one direction that another

I'm trying to get my head around volume rendering using three.js and ray marching GLSL. I've got some data I synthesised from a numpy array. The cube of data being rendered is more opaque on one side, graduating to being transparent on the other…
nrob
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Raymarching orthographic view

I need to calculate ray origin and ray direction vector for ray-marching orthographic view. I know that ray origin must move for each pixel and not stay from center and I believe this formula ro = ro + vec3(v_UV * orthRectSize, 0.); should work. I…
Bobi 1
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Ray marching on non-enclosed SDF

I am trying to implement ray marching rendering of some SDF and these SDFs represented interfaces and top surface of a structure with material regions distributed between adjacent SDF represented surfaces. In my case, new material regions are…
Plasma
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Raymarching - depth calculation

I wrote a simple ray marcher (goal is a nice volumetric fire), but I am stuck with this one issue presented on the screenshot below: when I am close enough, the depth test works correctly, but a tiny jerk backwards, and the box suddenly is…
Breeze
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How to understand the simpler calcNormal function?

I'm reading shadertoy tutorial here: https://inspirnathan.com/posts/52-shadertoy-tutorial-part-6 there is a normal method to calculate the normal of the sphere: vec3 calcNormal(vec3 p) { float e = 0.0005; // epsilon float r = 1.; // radius of…
tankin
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Screen-space shadows producing white result

I've been trying to learn screen-space techniques, specifically Ray-marching ones but I have been struggling to get a single working example to continue learning from and solidify my knowledge. I'm implementing Screen-space shadows following this…
Krellex
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How render 3D render texture in a Unity3D custom shader

Hi is it possible to render a 3d render texture on a custom shader raymarching like a 3dtexture? I use a 3D render texture because I calculate and set the color of the 3D volume in a compute shader. I set the rendertexture 3D as shown…
Sergio Solorzano
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Access Function Outside of Shader

I'm attempting to develop a game using OpenGL that renders a scene via a raymarching algorithm in a fragment shader. I intend to implement collision using the same signed distance field function that was used to render the scene. What I'm trying to…
Zac Heimgartner
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How to get the closest Axis-Aligned Bounding Box to a point?

I have a large array of Axis-Aligned Bounding Boxes, I'm trying to get the euclidean distance from a point to the closest one, I have tried manhattan distance but it doesn't seem to match the "brute force" result by iterating over all of them with…
Doofus
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My raw primitives cannot be displayed in Raymarching

I encountered a very strange problem while learning Raymarching. My equation cannot be displayed well. It can be displayed well in matlab. But it can't be shown on Shadertoy at all. My equation： f(x,y,z) =…
Joy900
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How can I correctly translate/rotate my camera in my 3d raymarched world

What I am trying to achieve So I'm a fractal enthusiast and decided to build a 2D/3D fractal generator in WebGL using raymarching, with Typescript as scripting language. I've been a C#/Typescript dev for several years but having zero experience with…
Arthur Visser
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