Measured quasi-diffuse material (mqdiffuse)#
Parameter |
Type |
Description |
Flags |
---|---|---|---|
filename |
string |
Filename of the volume to be loaded. |
|
grid |
VolumeGrid object |
When creating a grid volume at runtime, e.g. from Python or C++,
an existing |
|
accel |
boolean |
Hardware acceleration features can be used in CUDA mode. These features can cause small differences as hardware interpolation methods typically have a loss of precision (not exactly 32-bit arithmetic). (Default: true) |
This plugin models the reflection of light by opaque materials with a behaviour close to diffuse, i.e with no strong scattering lobe. Assumptions are as follows:
The material is isotropic. Consequently, only the azimuth difference matters.
The material is gray. Consequently, no spectral dimension is used.
The data dimension order is (cos_theta_o
, phi_d
, cos_theta_i
).
The sampling routine is uniform cosine-weighted (i.e. the same as for the
diffuse
plugin).
Warning
Table values are not checked internally: ensuring that the data is consistent (e.g that the corresponding reflectance is not greater than 1) is the user’s responsibility.