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Questions tagged [radiosity]

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2
votes
1answer
215 views

Radiosity normal map light baking

I'm trying to implement radiosity normal maps from the old Valve paper: Half-Life® 2 / Valve Source™ Shading.pdf | valvesoftware.com I've tried generating the light maps using Vray and 3dStudio max, ...
5
votes
2answers
1k views

How to calculate attenuation and radiance in PBR? (point and directional lights)

I would like implement physically based rendering, following this tutorial I was able to find a list of light sources ordered by lumens, but I have no idea how to use it in the calculations. ...
6
votes
2answers
170 views

Radiance at a nearly perpendicular angle is almost infinite?

As far as I understand, radiance is a measure of the "intensity" of light in a direction defined as a differential cone . It's measure is Flux per solid angle per projected area. $L = \frac{d\Phi}{d\...
4
votes
2answers
280 views

How to adapt diffuse/GI light mapper to directional light maps?

I have a working light mapper that captures global illumination. I evaluate a hemisphere when collecting the data and store the result in the texel. However, I want to support directional lightmaps so ...
3
votes
0answers
345 views

Calculating intensities of Virtual Point Lights in Instant Radiosity from IES lights

Short introduction I created a function that interpolates the IES luminious intensities (candelas) using Hermite interpolation, so in my code all light sources have $I(\theta, \phi)$ function - but ...
7
votes
0answers
71 views

Form Factors confusion in Radiosity papers

I feel a bit confused about the use of $F_{ij}$ and $F_{ji}$ in Radiosity papers. $F_{ij}$ should be the fraction of energy leaving patch $i$ that arrives at patch $j$. If you take the original ...
5
votes
1answer
247 views

How to implement Texture Baking?

So currently I want to implement radiosity in my engine. After figuring out the amount of light that bounces between elements/disks/patches (I've been told disks are the best - correct me if I'm wrong)...
6
votes
1answer
1k views

What is Radiosity?

After reading a wikipedia article about Global Illumination It mentions a variety of techniques like Ray Tracing, Path Tracing and Ambient Occlusion. One technique it mentions is Radiosity which I don'...
10
votes
0answers
373 views

Problem with definition of BSDF and radiance

When I was reading theory behind physical based rendering I noticed that definition of BSDF and radiance has some problems. For example BSDF of purely specular surfaces is zero almost everywhere and ...
8
votes
3answers
199 views

How does the view-independence of radiosity increase the calculations involved?

In the style of trichoplax' question, I want to talk about yet another Wikipedia article: Radiosity (computer graphics). The article states: Radiosity is viewpoint independent, which increases the ...
5
votes
1answer
124 views

Are there specific techniques for generating False Radiosity in surfaces?

I thought of this after my radiosity vs ray tracing question. A radiosity algorithm seems to require increased calculations because it's viewpoint independent and therefore, false radiosity was born (...
12
votes
1answer
5k views

Radiosity VS Ray tracing

Radiosity is basically what allows this: In a tutorial of Cornell University about Radiosity it is mentioned that: A ray-traced version of the image shows only the light reaching the viewer by ...