G3D::PathTracer::Options Class Reference

Classes
class	LightSamplingMethod

Public Member Functions
	Options ()

Public Attributes
float	areaLightDirectFraction = 0.7f
	Huch energy should be sampled via direct illumination/shadow rays ("Next event estimation") vs. More...
float	maxImportanceSamplingWeight = 1.5f
	Prevent low-probability glossy paths from receiving high weights. More...
Radiance	maxIncidentRadiance = 300.0f
	Prevent very low-probability caustic paths from increasing variance. More...
int	maxScatteringEvents = 5
	1 = direct illumination. More...
bool	multithreaded = true
	Default = true in Release mode and false in debug mode. More...
int	raysPerPixel = 64
	Only used for traceImage. More...
LightSamplingMethod	samplingMethod = LightSamplingMethod::LOW_DISCREPANCY_SOLID_ANGLE
bool	useEnvironmentMapForLastScatteringEvent = false
	If true, make the last scattering event a direct lookup against the Scene's environment map instead of an actual trace. More...

Constructor & Destructor Documentation

Options()

G3D::PathTracer::Options::Options ( )

inline

Member Data Documentation

areaLightDirectFraction

float G3D::PathTracer::Options::areaLightDirectFraction = 0.7f

Huch energy should be sampled via direct illumination/shadow rays ("Next event estimation") vs.

random indirect rays to emissive surfaces?

Extremes:

• 1.0 = pure direct illumination (good for small sources and diffuse surfaces)
• 0.0 = pure path tracing (good for large area lights and glossy surfaces)

maxImportanceSamplingWeight

float G3D::PathTracer::Options::maxImportanceSamplingWeight = 1.5f

Prevent low-probability glossy paths from receiving high weights.

Increase for more accuracy, decrease for less variance.

maxIncidentRadiance

Radiance G3D::PathTracer::Options::maxIncidentRadiance = 300.0f

Prevent very low-probability caustic paths from increasing variance.

Increase for more accuracy, decrease for less variance.

maxScatteringEvents

int G3D::PathTracer::Options::maxScatteringEvents = 5

1 = direct illumination.

Default = 5 in Release mode and 2 in Debug mode.

multithreaded

bool G3D::PathTracer::Options::multithreaded = true

Default = true in Release mode and false in debug mode.

raysPerPixel

int G3D::PathTracer::Options::raysPerPixel = 64

Only used for traceImage.

Default = 64 in Release mode and 1 in Debug mode. Not used by traceBuffer().

samplingMethod

LightSamplingMethod G3D::PathTracer::Options::samplingMethod = LightSamplingMethod::LOW_DISCREPANCY_SOLID_ANGLE

useEnvironmentMapForLastScatteringEvent

bool G3D::PathTracer::Options::useEnvironmentMapForLastScatteringEvent = false

If true, make the last scattering event a direct lookup against the Scene's environment map instead of an actual trace.

Path tracing with a fixed maximum number of scattering events is biased to produce a value that is too dark (because it always misses some light). useEnvironmentMapForLastScatteringEvent = true can reduce this bias, leading to faster convergence if the environment map is accurate.

Default = false.