23 votes
Accepted

What is the "dipole approximation" for subsurface scattering?

The assumption underlying such model is the same as lots of other models for skin rendering; the subsurface scattering can be approximated as a diffusion phenomenon. This is good because in highly ...
user avatar
  • 2,468
10 votes
Accepted

A recent approach for subsurface scattering

As mentioned in the comments, I would highly suggest starting with Full Volumetric Scattering. This is two fold: Since you are doing path tracing, adding volumetrics isn't super difficult. Fully ...
user avatar
  • 3,502
8 votes
Accepted

Subsurface Scattering Without Rays?

There are lots of ways to fake SSS with greater or lesser fidelity. A few recent-ish methods: Screen-space blurring of object lighting (described in detail here) Using “interior” ambient-occlusion ...
user avatar
6 votes
Accepted

How to create specular surface in Mitsuba Renderer

You want to use the "conductor" plugin to create a smooth conductor / metal type BRDF. See section 8.2.6 in the documentation. As far as Mitsuba is concerned, a mirror is a special instance of a ...
user avatar
  • 76
6 votes
Accepted

How does Smith multiple scattering interact with diffuse subsurface scattering?

The goal of Heitz et al.'s model is pretty much the opposite of subsurface scattering: They only consider surface scattering, i.e. the ray can never enter the material. Because microfacets are ...
user avatar
5 votes

A recent approach for subsurface scattering

For cases where the diffusion approximation is preferred over full volumetric path tracing, the method published by Solid Angle is fairly efficient: https://www.solidangle.com/research/...
user avatar
3 votes

What is the "dipole approximation" for subsurface scattering?

To easily understand the 'dipole theory' we have first to understand from where it comes from the 'diffusion theory'. And it comes from simulating light transport in participating media by solving ...
user avatar
2 votes

Confusion about data types in Jensen's subsurface scattering paper

The heading row of Figure 5(b) says that the units of $\sigma_s'$ and $\sigma_a$ are inverse millimetres, that is, inverse distance. Hence, $1/\sigma_t'$ has units of distance. If you send a beam of ...
user avatar
  • 751
2 votes
Accepted

[Subsurface Scattering]What's the meaning of diffuse coefficient `Rd` in bssrdf

$R_d$ is the diffusion profile. It's a falloff function that describes how light spreads through the material, as a function of the distance between the entering and exiting point. If you imagine a ...
user avatar
  • 23.7k
1 vote
Accepted

[Subsurface Scattering]Reflection from Layered Surfaces due to Subsurface Scattering

The factor $e^{-\tau_d (1/\cos \theta_i + 1/\cos \theta_r)}$ represents the attenuation of backscattered light due to the path it takes through the layer. Imagine for a moment a layer of thickness 1. ...
user avatar
  • 23.7k

Only top scored, non community-wiki answers of a minimum length are eligible