RTX Real-Time Settings

Eco Mode

Setting	Effect
Stop Rendering After This Many Frames Without Changes	If nothing is updated in the scene, rendering will be paused after this amount of frames, and will resume when a new update is triggered. This mode is useful to save power on laptops.

Anti-Aliasing

Algorithm: Off	Effect
Off	No Anti-Aliasing

Algorithm: TAA	Effect
Algorithm	Temporal Anti-Aliasing
Static Scaling	A scaling factor less than or equal to 1.0. If less than 1, upscaling is used.
TAA Samples	Higher sample count increases anti-aliasing quality.
TAA history scale	Values less than 1 produce smoother result, but may increase ghosting. Values greater than 1 can help reduce ghosting. The recommended range is 0 to 3.

Algorithm: FXAA	Effect
Algorithm	NVIDIA Fast Approximate Anti-Aliasing (this is a spatial-only AA algorithm).
Subpixel Quality	The amount of aliasing removal at the subpixel level. Higher values make the image softer.
Edge Threshold	The minimum amount of local contrast required to apply FXAA algorithm.
Edge Threshold Min	Pixels darker than this are not processed in order to increase performance.

Algorithm: DLSS	Effect
Algorithm	NVIDIA Deep Learning Super Sampling. Recommended.
Execution mode	Select between Performance, Balanced or Quality modes.
Sharpness	Higher values produce sharper results.
Exposure mode	Choose between Force self evaluated, PostProcess AutoExposure, Fixed.
Auto Exposure Multiplier	Factor with which to multiply the selected exposure mode.

Algorithm: RTXAA	Effect
Algorithm	NVIDIA RTX Anti-Aliasing.
Sharpness	Higher values produce sharper results.
Exposure mode	Choose between Force self evaluated, PostProcess AutoExposure, Fixed.
Auto Exposure Multiplier	Factor with which to multiply the selected exposure mode.

Direct Lighting

Setting	Effect
Direct Lighting	Enable direct light contributions from light primitives.
Enable Shadows	Enable shadows from light primitives (global setting).
Enable Sampled Direct Lighting	Enable a direct lighting mode that scales better to handle many lights. This mode is recommended to deal with scenes with more than about 10 lights.
Auto-enable Sampled Lighting Above Light Count Threshold	If enabled, Sampled Direct Lighting will be automatically enabled when a scene has more lights than the Light Count Threshold.
Auto-enable Sampled Lighting: Light Count Threshold	The threshold number of lights used by the Auto-enable Sampled Direct Lighting.

Non-Sampled Direct Lighting	Effect
Shadow Samples per Pixel	Higher values increase the quality of Direct Light Shadows at the cost of some performance.
Lower Resolution Shadows Denoiser	Enable for better performance by reducing the resolution of the per-light shadows denoiser.
Dome Lighting	Enable dome light contributions to diffuse BSDFs.
Dome Light Samples per Pixel	Higher values result in more accurate dome light sampling.
Dome Lighting in Reflections	Enable dome light contributions to diffuse BSDFs in reflections.

Sampled Direct Lighting	Effect
Samples per Pixel	Higher values increase the quality of Direct Light Shadows at the cost of some performance.
Clamp Sample Count to Light Count	When enabled, take one sample per pixel per light.
Reflections: Light Samples per Pixel	Number of times a light source in reflections is sampled (per pixel).
Reflections: Clamp Sample Count to Light Count	When enabled, take one sample per pixel per light seen in reflections.
Max Ray Intensity	Clamps the maximum brightness of a light sample.
Reflections: Max Ray Intensity	Clamps the maximum brightness of a light sample in reflections.
Firefly Filter	Choose the type of filter (None, Median, RCRS). Clamps overly bright pixels to a maximum value.
History Clamping	When enabled, reduces temporal lag.
Denoiser Iterations	Number of times the frame is denoised.
Enable Extended Diffuse Backscattering	Allow light to pass through thin semi-translucent geometry such as tree leaves.
Shadow Ray Offset	Shifts the starting point of shadow rays with diffuse backscattering.
Extinction	Higher values means less light passing through surfaces with diffuse backscattering.

Reflections

Setting	Effect
Reflections	Enable reflections.
Roughness Cache Cutoff	Roughness threshold above which reflections are approximated and not sampled directly. Higher values result in better quality, but worse performance.
Max Reflections Bounces	Number of reflection bounces.

Translucency

Setting	Effect
Translucency	Enables translucency for specular transmissive surfaces such as glass.
Max Refraction Bounces	Maximum number of refraction bounces.
Secondary Bounce Roughness Cutoff	Control when we trace reflection rays from refraction bounces based on how much the reflection contribution will be noticed.
Enable Fractional Cutout Opacity	Enable fractional values of cutout opacity (between 0 and 1) to be used to denote ‘presence’ or ‘coverage’ of a surface, resulting in a translucency-like effect similar to alpha-blending.
Enable Depth Correction for DOF	When enabled, depth of field takes translucent objects into account.
World Epsilon Threshold	Treshold below which image-based reprojection is used to compute refractions. Lower values result in higher quality, but worse performance.

Subsurface Scattering (Experimental)

Setting	Effect
Max Sample Per Frame	Max samples per frame.
Enable Denoiser	Enables denoising for the subsurface scattering.
Enable Transmission	Enables transmission of light through the medium, but requires additional samples and denoising.
Transmission BSDF Sample Count	Transmission sample count per frame.
Transmission Samples Per BSDF Sample	Transmission samples count per BSDF Sample. Samples per pixel per frame = BSDF Sample Count * Samples Per BSDF Sample.
Transmission Screen Space Fallback Threshold	Transmission threshold for screen-space fallback.
Enable Transmission Rendered in Half-Resolution	Enables rendering transmission in half-resolution to improve performance at the expense of quality.
Enable Transmission Sample Guiding	Enables transmission sample guiding, which may help with complex lighting scenarios.
Enable Transmission Denoiser	Enables transmission denoising.

Caustics

Setting	Effect
Caustics	Enable simulation of caustics generated by light emitted from area light primitives for which the ‘Enable Caustics’ flag is set. Note only Sphere, Rect and Disk lights support this.
Photon Count Multiplier	Factor that will be multiplied by 1024 to compute the total number of photons to generate from each light.
Photon Max Bounces	Maximum number of bounces to compute for each light/photon path.
Position Phi
Normal Phi
Filter Iterations	Number of iterations for the denoiser applied to the results of the caustics tracing pass.

Indirect Diffuse Lighting

Setting	Effect
Ambient Light Color	Color of the global environment lighting.
Ambient Light Intensity	Brightness of the global environment lighting.
Enable Ambient Occlusion (AO)	Enables the use of Ambient Occlusion, which approximates the occlusion.
AO Ray Length	The length of the AO rays traced. Geometry beyond this distance will not result in AO-based darkening.
AO Minimum Samples per Pixel	The lowest number of AO samples (rays) to trace per frame.
AO Maximum Samples per Pixel	The highest number of AO samples (rays) to trace per frame.
AO: Denoiser	Allows for increased AO denoising at the cost of more blurring.
Enable Indirect Diffuse GI	Enables Diffused Global Illumination.
Samples per Pixel	Higher values result in smoother looking GI.
Max Bounces	More bounces allow more potential GI contribution in occluded areas.
Intensity	Controls the intensity of the GI contribution evenly across the occluded area.
Denoising Technique	Denoising algorithm selection.

Denoising Technique: NVRTD	Effect
Kernel Radius	Controls the spread of local denoising area. Higher values results in smoother GI.
Iteration Count	The number of denoising passes. Higher values results in smoother looking GI.
Max History Length	Controls latency in GI updates. Higher values results in smoother looking GI.

Multi-GPU

Setting	Effect
Multi-GPU	Enables use of multiple GPUs in real-time mode (when these are available and enabled at startup) Multi-GPU must be enabled at startup by passing adding –/renderer/multiGpu/enabled=true to the command line. The current multi-GPU algorithm in real-time mode splits the rendering of the image into a large tile per GPU with a small overlap region between these tiles.
Tile Count	Number of tiles to split the image into. Usually this should match the number of GPUs, but it can be less.
GPU 0 Post Process only	If set, the first GPU is dedicated to post processing only, and no scene rendering is done on it.
Tile Overlap (Pixels)	Width, in pixels, of the overlap region between any two neighboring tiles.
Fraction of Overlap Pixels to Blend	Fraction of the Tile Overlap region width for which pixels will be blended between tiles.