Two Monte Carlo backward ray tracer are provided: Path tracing and Radiance software.
- Iterations N: “The error in the Monte Carlo calculation of indirect illuminance will be inversely proportional to the square root of this number:four times more samples are required to decrease the error by half.
- In Radiance option: This value corresponds to ambient divisions “–ad” parameter:
number of rays casted from the surface point to its hemisphere about the normal to estimate the radiance values. Each ray if not absorbed or terminated spawns to N more rays. - In Path tracing: Since no branching happens on each bounce this value determines the total number of indirect paths initiated from the sensor.
- In Radiance option: This value corresponds to ambient divisions “–ad” parameter:
- Indirect Bounces:
- In Radiance: This is the maximum number of diffuse bounces computed by the indirect calculation. A value of zero implies no indirect calculation.
- In path tracing: This is the minimum number of bounces. Russian Roulette probability is applied after reaching this number.
