Questions tagged [theory]
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5
questions
0
votes
1answer
213 views
Difference betwen Rendering Equation, Lighting model, Ray Tracing, Global Illumination and Shadows?
What is the difference between all these techniques? I know what a lightning model does, eg Phong, Flat, Gouraud. As far as I know both Ray Tracing and Global Illumination are just lighting models ...
3
votes
1answer
385 views
Rendering Fluid Simulations?
I've read about Lagrangian and Eulerian fluid simulations and here's what I take from their methods:
Lagrangian - Simulating fluid particles by calculating displacement for each particle
Eulerian - ...
4
votes
1answer
187 views
Pixel density / color channel depth ratio for dithered gradients
Dithering increases percieved color depth by adding a "noise" to an image on transform from high color depth (e.g. 32-bit floating point) to lower color depth (e.g. 8-bit integer). A prerequisite is ...
11
votes
0answers
461 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 ...
17
votes
1answer
409 views
Why integrate over a hemisphere (and not a sphere) to solve the rendering equation?
In most text books that I have seen, this is how the rendering equation is written:
$$L_0( \omega_0)= L_e(\omega_0)+\int_{\Omega}{f(\omega_i, \omega_0)L_i(\omega_i)\,\mathrm{d}\omega_i}$$
Where $\...
