Denoising

Denoising allows you to toggle denoising on and off, as well as tune denoising parameters in detail. Denoising is a critical part of modern Path Tracing renderers and turning it off entirely has mainly educational value. Adjusting the individual settings may be beneficial for image quality or compatibility, depending on the game and mod in question.

Ref	Option	RTX Option	Default Value	Description
1	Denoising Enabled Checkbox	rtx.useDenoiser	Checked	Enables usage of denoiser(s) when set to true, otherwise disables denoising when set to false. Denoising is important for filtering the raw noisy ray traced signal into a smoother and more stable result at the cost of some potential spatial/temporal artifacts (ghosting, boiling, blurring, etc). Generally should remain enabled except when debugging behavior which requires investigating the output directly, or diagnosing denoising-related issues.
2	Reference Mode Checkbox	rtx.useDenoiserReferenceMode	Unchecked	Enables the reference “denoiser” when set to true, otherwise uses the standard denoiser when set to false. Note this requires the denoiser to be enabled to function. The reference denoiser allows for a reference multi-sample per pixel contribution to accumulate which should converge slowly to the ideal result the renderer is working towards. Useful for analyzing quality differences in various denoising methods, post-processing filters, or for more accurately comparing subtle effects of potentially biased rendering techniques which may be hard to see through usual noise and filtering. Also useful for higher quality artistic renders of a scene beyond what is possible in real time.
3	Settings
4	Separate Primary Direct/Indirect Denoiser Checkbox		Unchecked	Seperatethe Primary Direct and Indirect layers into their own individual option levels
5	Reset History on Setting Change Checkbox	rtx.resetDenoiserHistoryOnSettingsChange	Unchecked
6	Replace Direct Specular HitT with Indirect Specular HitT Checkbox	rtx.replaceDirectSpecularHitTWithIndirectSpecularHitT	Checked
7	Pre-NRD Filter HitT Signal Checkbox		Unchecked
8	Filter Fireflies in Disocclusion Checkbox		Unchecked
9	Use Virtual Shading Normals Checkbox	rtx.useVirtualShadingNormalsForDenoising	Checked	A flag to enable or disable the usage of virtual shading normals for denoising passes. This is primarily important for anything that modifies the direction of a primary ray, so mainly PSR and ray portals as both of these will view a surface from an angle different from the “virtual” viewing direction perceived by the camera. This can cause some issues with denoising due to the normals not matching the expected perception of what the normals should be, for example normals facing away from the camera direction due to being viewed from a different angle via refraction or portal teleportation. To correct this, virtual normals are calculated such that they always are oriented relative to the primary camera ray as if its direction was never altered, matching the virtual perception of the surface from the camera’s point of view. As an aside, virtual normals themselves can cause issues with denoising due to the normals suddenly changing from virtual to “real” normals upon traveling through a portal, causing surface consistency failures in the denoiser, but this is accounted for via a special transform given to the denoiser on camera ray portal teleportation events. As such, this option should generally always be enabled when rendering with ray portals in the scene to have good denoising quality.
10	Adaptive Resolution Denoising Checkbox	rtx.adaptiveResolutionDenoising	Checked
11	Adaptive Accumulation Checkbox	rtx.adaptiveAccumulation	Checked
12	Demodulate Roughness Checkbox	rtx.demodulate.demodulateRoughness	Checked	Demodulate roughness to improve specular details.
13	Roughness sensitivity	rtx.demodulate.demodulateRoughnessOffset	0.100	Strength of roughness demodulation, lower values are stronger.
14	Direct Light Boiling Filter Checkbox	rtx.demodulate.enableDirectLightBoilingFilter	Checked	Boiling filter removes direct light samples when its luminance is too high.
15	Direct Light Boiling Threshold	rtx.demodulate.directLightBoilingThreshold	5.0	Remove direct light samples when its luminance is higher than the average one multiplied by this threshold.
16	Enhance BSDF Detail Under DLSS Checkbox		Checked
17	Indirect Light Enhancement Mode Dropdown		Normal Difference	Choices: Laplacian & Normal Difference
18	Direct/Indirect Light Sharpness		0.70, 1.00
19	Direct/Indirect Light Max Strength		10.00, 1.50
20	Pixel Highlight Reuse Strength	rtx.pixelHighlightReuseStrength	0.500	The specular portion when we reuse the last frame’s pixel value.
21	Indirect Light Min Sharpen Roughness		0.300
22	Use Post Filter Checkbox	rtx.postfx.enable	Checked	Enables post-processing effects.
23	Post Filter Threshold	rtx.postFilterThreshold	0.300	Clamps a pixel when its luminance exceeds x times of the average.
24	Noise Mix
25	Noise Mix Ratio Slider		0.200
26	Noise NdotV Power Slider		0.500
27	Noise Clamp Low Slider		0.500
28	Noise Clamp High Slider		2.000
29	Primary Direct/Indirect Light Denoiser
30	NRD Version
31	Denoiser Dropdown		ReLAX	Choices: ReBLUR & ReLAX
32	Reset History
33	Advanced Settings Checkbox		Unchecked	Reveals the Reprojection Test Skipping without motion checkbox
34	Integrator Settings
35	Diffuse
36	Max Direct HitT % Slider	rtx.denoiser.maxDirectHitTContribution	-1
37	Specular
38	Lobe Trimming: Main Level Slider		1.000
39	Lobe Trimming: Low Roughness Slider		1.000
40	Lobe Trimming: High Roughness Slider		0.000
41	Common Settings
42	Frame Time Delta [ms]	rtx.timeDeltaBetweenFrames	0.0	Frame time delta to use during scene processing. Setting this to 0 will use actual frame time delta for a given frame. Non-zero value is primarily used for automation to ensure determinism run to run.
43	Debug		0.000
44	Denoising Range		65400.0
45	Disocclusion Threshold		0.010
46	Disocclusion Threshold Alt.		0.100
47	Split screen: Noisy | Denoised Output		0.000
48	ReLAX Settings
49	Preset Dropdown		Finetuned (More Stable)	Choices: Finetuned. Finetuned (More Stable), & RTXDI Sample
50	History Length (ms) Slider		500.0
51	Min History Length (frames) Slider		15
52	Diff fast history length (frames) Slider		2
53	Spec fast history length (frames) Slider		6
54	Anti-firefly Checkbox		Checked
55	Roughness edge stopping Checkbox		Checked
56	Virtual history clamping Checkbox		Checked
57	HitT Reconstruction Mode Dropdown		Area 3x3	Choices: Off, Area 3x3, & Area 5x5
58	PRE-PASS:
59	Diff preblur radius Slider		50.0
60	Spec preblur radius Slider		50.0
61	REPROJECTION:
62	Spec variance boost Slider		0.00
63	Clamping sigma scale Slider		2.0
64	SPATIAL FILTERING:
65	A-trous iterations Slider		5
66	Diff-Spec luma Weight Sliders		1.0, 1.0
67	Diff-Spec-Rough fraction Sliders		0.90, 0.55, 0.45
68	Luma-Normal-Rough relaxation Sliders		0.65, 0.80, 0.50
69	Spec lobe angle slack Slider		12.500
70	Diff-Spec min luma weight Sliders		0.050, 0.000
71	Depth threshold Slider		0.010
72	Confidence Driven Relaxation Multiplier Slider		0.700
73	Confidence Drive Luminance Edge Stopping Relaxation Slider		1.500
74	Confidence Driven Normal Edge Stopping Relaxation Slider		0.600
75	DISOCCLUSION FIX:
76	Edge-stop normal power Slider		8.0
77	History Fix Stride Between Samples Slider		32.0
78	Frames to fix Slider		2
79	SPATIAL VARIANCE ESTIMATION:
80	History threshold Slider		2
81	Secondary Direct/Indirect Light Denoiser			(Please review Reference’s 29 - 80 for descriptions for all secondary settings)

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