The following attributes are deprecated. A more user friendly method for the functions below will be available soon.
Photon Color
This attribute defines how the photons will receive their color and opacity. The available choices are:
`Primitive Color & Opacity'
The photons get their color from Cs and their opacity from Os. It is possible to define these two attributes using the "Color" and "Opacity" attributes, respectively (see [Color], page 19 and [Opacity], page 19). This value should be preferred as it is faster to compute.
‘Shader'
The photons get their color and opacity from the attached surface shader. This is the default.
Photon Estimator
The number of photons that shading operations relying on photons will use. The default number of photons is 50.
Shading Model
This attribute determines how the attached objects surfaces will interact with photons. Note that for photons to interact with surfaces you have to make them visible to photons (they are by default) in the visibility attribute (see Visibility). The available shading models are summarized in the table below.
| Value | Description |
|---|---|
| Transparent | There will be no interactions with photons. This is the default. |
| Matte | Generates a diffuse reflection and is fine for color bleeding effects. |
| Chrome | Reflects all photons like a mirror. It also generate caustics |
| Glass | This value will partly reflect photons, partly refract them. It also generate caustics. |
| Water | Similar to `Glass' but has the refraction index of water. |