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RTX Character Rendering Sample User Guide

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The RTX Character Rendering Sample provides an example of using the RTX Character Rendering libraries for hair and skin. It also provides a GUI to easily interact with the sample, including changing materials in real-time to demonstrate rendering details for skin and hair.

The GUI can be opened or closed using the ESC key on the keyboard.

Generic

Name Description
Camera Speed The speed of camera
Lock Camera Lock the camera or allow moving/rotation
Scene Select the render scene
Refresh Scene Reload the current scene
Back Face Culling Enable/Disable backface culling
Enable Soft Shadows Enable/Disable soft shadows from punctual lights
Transmission Allow rays to penetrate the surface and sample on the other side as refraction ray
Recompile Shader Recompile shaders in real time; any compilation errors will be displayed in the console window
Capture Screenshot Capture a screenshot of the current render result and save it as a .png file in the bin/screenshots/ folder

DLFG

DLFG (DLSS Frame Generation) is supported in our sample on RTX 40 and 50 series GPUs.

  • RTX 40 series: Supports single-frame generation.
  • RTX 50 series: Supports up to 3 generated frames (4× DLFG) for higher frame rates.

Reflex

Reflex is supported in our sample to reduce system latency and improve responsiveness.

  • Low Latency: Minimizes input lag by syncing CPU and GPU work.
  • Low Latency + Boost: Includes Low Latency plus keeps GPU at high clocks to avoid slowdowns when CPU-limited.

Path Tracing

Name Description
Enable Random Enable random light and BSDF sampling
Bounces Maximum number of bounces allowed for each path
Exposure Adjustment Post-processing exposure adjustment
Debug Output Show Debug Views

Denoiser

Denoiser selection: we currently support DLSS-RR, NRD, and reference mode.

DLSS-RR has following 5 quality modes:

  • DLAA: Full-screen denoiser. Ultimate Quality.
  • Quality: Best quality with some performance cost.
  • Balance: Best balance mode between quality and performance.
  • Performance: Better performance, could have minor artifacts or blurries.
  • UltraPerformance: Best performance, but could cause significant artifacts and blurries.

We also provide NRD as an alternative denoiser, compatible with any ray tracing-capable GPU. For more details, check the NRD Guide

Upscaler

Upscaler Selection: When using NRD or disabling the denoiser, we currently support DLSS-SR and TAA as upscalers.

Similar to DLSS-RR, DLSS-SR also has 5 quality modes:

  • DLAA: Full-screen denoiser. Ultimate Quality.
  • Quality: Best quality with some performance cost.
  • Balance: Best balance mode between quality and performance.
  • Performance: Better performance, could have minor artifacts or blurries.
  • UltraPerformance: Best performance, but could cause significant artifacts and blurries.

Lighting

Name Description
Enable Sky Enable skybox
Sky Type Constant/Procedural/EnvironmentMap
Environment Map Choose the environment map from assets folder
Environment Light Intensity The scalar for environment map lighting
Enable Emissives Enable the emissive surfaces
Show Emissive Surfaces Show the emissive surfaces. If disabled, the emissives will still be calculated, but the surfaces will be invisible
Enable Lighting Enable/Disable all lights
Enable Direct Lighting Enable the direct lighting
Enable Indirect Lighting Enable the indirect lighting

Hair

See explanations of parameters in RTX Character Rendering Hair Guide, Step 2.

To use the GUI parameters, tick "Enable Hair Material Override".

Subsurface Scattering

See explanations of parameters in RTX Character Rendering SSS Guide, Step 2.

To use the GUI parameters, tick "Enable Hair Material Override".

Animation

Name Description
Enable Animation Globally enable animation.
Speed Animation playback speed, in seconds per frame.
Enable Animation Smoothing Smooth the transition of the last frame to avoid sudden jumps back to the first frame.
Smoothing Factor Controls the amount of smoothing applied to the animation.
Enable Animation Debugging Enable debugging for animation playback.
Animation Keyframe Index Override Render the animation at a specific keyframe index.
Animation Keyframe Weight Override Render the animation between keyframe N and N+1 with a specific interpolation weight.

Tone mapping

Name Description
Operator Tonemapping operator, support Reinhard and Linear
Clamp Clamp final output color to 0-1

Cmdline Options

Generic

  • -d3d12 or -dx12: Use DirectX 12 as the graphics API (default). DirectX 11 is not supported in this sample.
  • -vk or -vulkan: Use Vulkan as the graphics API.
  • -borderless: Create a window without borders.
  • -fullscreen: Launch in fullscreen mode.
  • -1080p, -1440p, -2160p: Set the initial resolution (1080p, 2K, or 4K).
  • -scene: Specify the scene to load in the sample.
  • -screenshot: Specify the screenshot filename.
  • -enableSky: Enable or disable the skybox.

Denoiser

  • -denoiser: Select denoiser mode: None(0), NRD(1), or DLSS-RR(2).
  • -nrdMode: Select NRD mode: Reblur(0) or Relax(1).
  • -accumulate: Enable reference accumulation mode.

Hair

  • -hairBsdf: Select hair BSDF: Chiang BSDF(0) or FarField BSDF(1).
  • -hairColorMode: Select hair color mode: color(0) or physics(1).
  • -enableHairOverride: Enable hair override from the GUI.
  • -hairRadiusScale: Scale factor for hair radius.
  • -hairTessellationType: Select hair geometry tessellation: Polytube(0), DOTS(1), or LSS(2).

Animation

  • -enableAnimation: Enable morph target animation.
  • -animationKeyframeIndex: Debugging option. Render the animation at a specific keyframe index.
  • -animationKeyframeWeight: Debugging option. Render the animation between keyframe N and N+1 with a specific interpolation weight.