# Questions tagged [raytracing]

Questions specific to raytracing (as opposed to scanline rendering), the 3D graphics technique of intersecting rays from the camera with objects in the scene.

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### Getting something close to the convex full of SDFs using CSG operations

Inigo Quilez has an explanation of smooth operations to join sdfs. I am trying to get something close to the convex hull of multiple sdfs. For starters let;s consider a simple case of 3 cubes int eh ...
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1 vote
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### Difficulty in understanding the interpretation of propagation of an exitant function from the book Advanced Global Illumination (2nd ed)

The book defines operator $\mathcal{T}$ for the propagation of an exitant function as: if I'm assuming that the position of the point $x$ is on the top-left surface, and that $\Psi$ is considered as ...
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1 vote
67 views

### Ray Tracing With Continuous Refraction

I want to write a simple ray tracing(?) algorithm in WebGL with continuous refraction. So my idea was, what if you have a material whose optical density varies continuously, if this is physically ...
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1 vote
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### When sampling direct light, what to do if testing ray been blocked by transparent object?

As the title above. I am trying to sampling direct light and indirect light. But I have many transparent objects in scene, it's very likely to block the testing ray. To my understanding, it's not good ...
• 131
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### Ray tracing tree

Let's suppose that we have a light source. Which of the following are correct for the tree of recursive ray-tracing (ray tree) that create when we make the colors for each pixel in the screen. Which ...
126 views

### Can someone explain why raytracing isn't able to make Global Illumination?

I've watched a few videos about raytracing vs pathtracing, and one thing that consistently pops up is the idea that pathtracing seems to be able to do global illumination, whilst raytracing is not. ...
963 views

### Fundamental drawbacks of rasterization over ray tracing

Are there any fundamental drawbacks/limitations of rasterization as compared to ray-tracing? When I search on the internet, I get vague explanations like rasterization does not provide lighting ...
56 views

### Raytracing, divide by PDF neutralized the effect of D and G terms, what is the problem?

Following some documents on internet, I divide my ray tracing result by PDF. Then it seem the D and G terms disappeared. Only F term is still visible, it looks like Fresnel only. ...
• 131
1 vote
85 views

### Ray tracing Bug with Diffuse material

I am trying to do ray tracing in python (following the tutorial given in Ray Tracing in a weekend). Basically I am shooting rays from eye and the recursively bounce around, each time they hit ...
• 131
1 vote
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### Ray tracing geometries with same position, translation and scale

this is my first post on the Computer Graphics Stackexchange forum. Apologies in advance if I am doing something wrong. I have the problem that I have a scene with overlapping geometries. To be more ...
129 views

### Ray casting and rasterization 101

Recently I've became an intern in company-name and my internship task is(for now) create rasterization using rays. I'm mostly interested in pure math, so basic ...
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### Path tracing : fireflies/hot pixels when directly sampling lights

I am implementing a pathtracer with both indirect and direct light sampling at each intersection (I believe the "direct light sampling" part is also referred to as "next event ...
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### What can be the cause of some strange ray shadows artefacts on a perfectly flat surface?

First of all I have to say that I am really new in the world of Computer Graphics. I apologise if some of my questions may appear trivial. I am currently using a non-commercial ray tracing and ...
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