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Questions tagged [volumetric]

The tag has no usage guidance.

0
votes
1answer
38 views

Choosing corner values for trilinear interpolation

I'm caching distances for SDF functions in volume textures for faster rendering, and I'd like to use trilinear interpolation for smoother edges. I know that I'll need distance values at each corner; ...
1
vote
0answers
35 views

Has anybody extended parametric surfaces to volume density representations usefully?

Current mainstream technology does not really model the density functions very well. Yeah, we can use volumetric grids, FEM, voxel representations and particle clouds that define densities. But these ...
0
votes
0answers
40 views

Nubis Decima Engine presentation, how is the cloud density function computed?

WARNING: for what ever reason Firefox (maybe linux specific) doesn't like to render everything in the pdf slides, but you wouldn't know it because it will look completely fine until you compare it ...
0
votes
1answer
65 views

How to compute volume of intersection of non-axis-aligned cuboids in 3D?

Given two cuboids in 3D space (8 vertex coordinates each) that are arbitrarily oriented, how can we find the volume of overlap between them in the fastest manner?
2
votes
0answers
89 views

Not understanding the lighting equation for volumetric cloud rendering

I've been looking The Real-time Volumetric Cloudscapes of Horizon-Zero Dawn, but I'm very confused by a few terms. The presentation mentions "The Henyey-Greenstein phase function" on page 54, ...
4
votes
1answer
164 views

Experimental real-time shadowing techniques?

The three most popular shadowing techniques for real time applications are: Shadow maps Advantages: Fast "Simple" Disadvantages: Numerical limitations lead to artifacts and jaggy shadows You ...
4
votes
1answer
160 views

How to do heterogeneous volume absorption using path tracing?

I want to do volume rendering using path tracing with a absorption only model. And my data is in a 3D grid, which is turned into a voxel medium in my renderer. However, I can't seem to be correct ...
3
votes
1answer
212 views

Volumetric raycasting with transparent rasterized geometry

I have an idea of how to render opaque rasterized geometry alongside raycast volumes: Render rasterized geometry to a depth map and also a render target When raycasting, check position against the ...
5
votes
1answer
624 views

Volume Rendering (Path Tracing & Real-Time)

I have a few doubts and questions regarding volume rendering, I was hoping someone here could help me understand. I commonly hear the terms 'Ray-Marching' & 'Volume Rendering' being used together ...
3
votes
2answers
149 views

Frustum aligned volume integration - aliasing issue - temporal reprojection

Raw volume raymarching especially aligned with frustum seem to produce a lot of aliasing/banding on edges of shadow map. Especially when fragment pos is far because step length is then getting bigger. ...
5
votes
1answer
249 views

mapping 3d texture on view frustum (or part of it)

I'm implementing volumetric fog in my OpenGL renderer. First I inject color into 3D texture using compute shader, atomic operations and shadow map visibility check. The information I use to compute ...
6
votes
1answer
146 views

Volume Rendering in simple words

I am looking for a explanation about volume rendering in simple words, a step by step kind of, like ray tracing: for every pixel in the screen plane, trace a ray starting from the eye point to ...
7
votes
3answers
2k views

How are volumetric effects handled in raytracing?

How are volumetric effects such as smoke, fog, or clouds rendered by a raytracer? Unlike solid objects, these don't have a well-defined surface to compute an intersection with.
11
votes
1answer
137 views

Volumetric rendering fundamental concepts and terminology

Literature on rendering volumetric materials and effects tends to use a lot of mathematical physics terminology. Let's say that I have a decent handle on the concepts involved in surface rendering. ...