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Questions tagged [volume-rendering]

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Distance sampling with unbiased transmittance estimators

I'm currently trying some things with transmittance estimators in PBRT and I have implemented the following paper: Unbiased Ray-Marching Transmittance Estimator. This method assumes that two points $x$...
Matthias K.'s user avatar
2 votes
0 answers
235 views

Spherical Harmonics for view-dependent effects in research of learned radiance fields (NeRF, 3D Gaussian Splatting)

In research on making the rendering of learned radiance fields (e.g., neural radiance fields) faster, many approaches use Spherical Harmonics (SH) to approximate view-dependent color (e.g. baking SH ...
wawaderwaran's user avatar
1 vote
0 answers
61 views

Questions about equi-angular sampling

Equiangular sampling is a sampling method for point (sphere) emitter in scattering medium. While it claims to be very efficient when dealing with point (sphere) emitter in scattering medium (see this ...
Enigmatisms's user avatar
1 vote
0 answers
52 views

Measure for volumetric rendering equation

Recently I've been digging deeper into the volumetric rendering (volumetric path tracing, to be specific). I already know that for surface rendering, there are two commonly used measures (reference ...
Enigmatisms's user avatar
2 votes
0 answers
46 views

How to properly use scattering coefficient during volumetric path tracing?

The increased radiance during sampling is known by: $$ L_s = L_e + \sigma_s \int p(w, w')f_p(w, w')dw' $$ The latter part, which accounts for in-scattering radiance bears a $\sigma_s$ in it. The ...
Enigmatisms's user avatar
1 vote
0 answers
56 views

Term confusion about volume scattering

We have two different terms, for example, let's talk about scattering only. Scattering coefficient Scattering cross-section These two terms are supposed to have different physical meaning. I read it ...
Enigmatisms's user avatar
1 vote
1 answer
140 views

How to compute discrete partial derivatives in 3D

I'm supposed to compute partial derivatives for 3D volume rendering (in ray tracing). I'm bad at math and so I can't understand what $f$ is in my case. In reviewing examples, I'm seeing the $f$ ...
Mote Zart's user avatar
  • 111
0 votes
1 answer
141 views

How to render and store a color gradient in a ramp texture for 16bit dataset?

I'm working on a scientific visualization project and need to create a transfer function widget. The volume data is either in range 0-255 or it can be 16 bit i.e. <...
gallickgunner's user avatar
1 vote
1 answer
45 views

What can be reduce in peripheral circle and increase in foveated cirle?

Foveated rendering, is definitely one of the newest fields of real-time graphics rendering. The main goal of foveated rendering is reducing rendering cost to increase frame-rate without perception ...
bim's user avatar
  • 135
0 votes
2 answers
1k views

How to visualize density data as volume using OpenGL?

I have a CT scan of a portion of a human body, with each point describing density. The data file provides X, Y, Z, and density values. I want to know how to visualize this data, using OpenGL or a ...
user2309000's user avatar
0 votes
0 answers
130 views

Euclideon Unlimited Details Voxel Engine Architecture

As I understand Euclideon haven't just rendered voxels for these infamous demos, since the amount of geometry is still too large for the 2010 PC with software raytracer and the model taking whole HDD ...
Nash Gold's user avatar
  • 133
3 votes
0 answers
448 views

volume raymarching - aligning sample coords with the 3d texture

I'm implementing a volume raymarcher and the unlit basic version seems to be working fine. This article helped a ton grokking the view-to-volume-space transform: http://www.lebarba.com However, it ...
Jakob's user avatar
  • 131
0 votes
2 answers
534 views

How to handle different data types (uint8, uint16, float) in Volume Datasets?

So I've written a personal volume renderer which currently visualizes datasets (CT-Scans mostly) that have a .raw extension and the values are in the range ...
gallickgunner's user avatar
0 votes
0 answers
113 views

Pixelated /aliased /blurry edges in volumetric rendering

I have been trying to implement a simple GPU based volumetric renderer, somewhat similar to described here. I conceptually understand most of the stuff, and implemented some code, but my results are ...
user3029710's user avatar
2 votes
1 answer
254 views

Volume Rendering - Dataset not rendered correctly

So Im trying to implement a Volume Renderer mainly for medical images like CT-scans and MRI images using GPU raymarching. I'm using the book "Real Time Volume Graphics" and this tutorial as a refernce....
gallickgunner's user avatar