SofterShadows

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Experimental soft shadow rendering feature for Unity URP using screen-space shadow compositing.

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ZIP 다운로드

- - PlayerLogViewer.cs
  - PlayerLogViewer.cs.meta
  - SetGameObjectToEditorCamera.cs
  - SetGameObjectToEditorCamera.cs.meta
  - ToggleUnityShadows.cs
  - ToggleUnityShadows.cs.meta
- - DefaultVolumeProfile.asset
  - DefaultVolumeProfile.asset.meta
  - Mobile_Renderer.asset
  - Mobile_Renderer.asset.meta
  - Mobile_RPAsset.asset
  - Mobile_RPAsset.asset.meta
  - PC_Renderer.asset
  - PC_Renderer.asset.meta
  - PC_RPAsset.asset
  - PC_RPAsset.asset.meta
  - SampleSceneProfile.asset
  - SampleSceneProfile.asset.meta
  - UniversalRenderPipelineGlobalSettings.asset
  - UniversalRenderPipelineGlobalSettings.asset.meta
- - Runtime.meta
  - Samples.meta
  - ThirdParty.meta
- - Fonts.meta
  - Resources.meta
  - Shaders.meta
- - Icons.meta
  - Layout.wlt
  - Layout.wlt.meta
  - Scripts.meta
- Editor.meta
- InputSystem_Actions.cs
- InputSystem_Actions.cs.meta
- InputSystem_Actions.inputactions
- InputSystem_Actions.inputactions.meta
- Readme.asset
- Readme.asset.meta
- Settings.meta
- SofterShadows.meta
- TextMesh Pro.meta
- TutorialInfo.meta
- manifest.json
- packages-lock.json
- AudioManager.asset
- ClusterInputManager.asset
- DynamicsManager.asset
- EditorBuildSettings.asset
- EditorSettings.asset
- GraphicsSettings.asset
- InputManager.asset
- MemorySettings.asset
- MultiplayerManager.asset
- NavMeshAreas.asset
- PackageManagerSettings.asset
- Physics2DSettings.asset
- PresetManager.asset
- ProjectSettings.asset
- ProjectVersion.txt
- QualitySettings.asset
- SceneTemplateSettings.json
- ShaderGraphSettings.asset
- TagManager.asset
- TimeManager.asset
- UnityConnectSettings.asset
- URPProjectSettings.asset
- VersionControlSettings.asset
- VFXManager.asset
- XRSettings.asset
.gitignore
BistroPCFPCSS.png
README.md
SponzaEVSM.png

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// repository documentation

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> **This is an experimental package and is not intended for use in production.**
> Because shadows are composited in screen space, the system has no knowledge of material attenuation. This causes notable issues with the undersides of objects that receive shadows, where shading is incorrect. Other issues include edges being shaded and issues with transparent materials.

A custom shadow rendering solution for Unity's Universal Render Pipeline (URP). It replaces URP's built-in shadow system with screen-space shadows and gives you per-cascade control over shadow maps, blur, and sampling methods.

---

## Examples
![Sponza EVSM](https://raw.githubusercontent.com/Mortal-Dev/SofterShadows/master/SponzaEVSM.png)
Sponza with EVSM

![Bistro PCF PCSS](https://raw.githubusercontent.com/Mortal-Dev/SofterShadows/master/BistroPCFPCSS.png)
Bistro with PCF/PCSS

Download Samples: https://github.com/Mortal-Dev/SofterShadows/releases/

## Tested On

- Unity 6000.4.6f1
- Universal Render Pipeline 17.4.0
- DirectX 11 / DirectX 12

---

## Setup

1. Open your project in Unity.
2. Copy the `Assets/SofterShadows` folder into your project's `Assets` folder.
3. In your URP Renderer asset, add the `SofterShadowsRenderingFeature` renderer feature.
   - Go to your renderer asset (e.g. `PC_Renderer` or `Mobile_Renderer`) in the Inspector.
   - Click `Add Renderer Feature` and select `SofterShadows Rendering Feature`.
5. In your URP Pipeline asset (e.g. `PC_RPAsset`), disable `Cast Shadows` under the Lighting section. SofterShadows handles shadow rendering itself.

---

## How It Works

SofterShadows bypasses URP's default shadow maps and renders its own depth passes per cascade. Those depth maps are then sampled in screen space and composited back onto the scene.

The rendering happens in four stages:

1. A custom depth pass renders shadow casters into one texture per cascade.
2. An optional blur pass softens the shadow maps before sampling.
3. A screen-space pass samples the shadow maps and writes the result to a shadow texture.
4. A final blit composites the shadow texture onto the screen.

---

## Configuring the Renderer Feature

Select your renderer asset and click on the `SofterShadowsRenderingFeature` entry to see its settings.

**Shadow Strength** - Controls overall shadow opacity. 0 is invisible, 1 is full strength.

**Normal Bias / Depth Bias** - Offsets used to reduce shadow acne. Increase if you see striping on surfaces. Default values are 1.0 and 0.04.

**Shadow Cascades** - A list of cascade entries, each with:
- `Min Distance` / `Max Distance` - The camera distance range this cascade covers.
- `Shadowmap Resolution` - Resolution of the shadow map for this cascade. Options are 1024, 2048, 4096, 8192, and 16384. Higher values are sharper but more expensive.

You can have up to 10 cascades. Cascade distance ranges must not overlap and must be set in order.

**Soft Shadow Setting** - A ScriptableObject that controls how shadows are sampled. See the section below.

---

## Shadow Sampling Modes

Create a Soft Shadow Setting asset by right-clicking in your Project window and going to `Create > Soft Shadow Setting`. There are four types:

### Hard
Standard hard-edged shadows. No blur or filtering. Cheapest option.

### PCF (Percentage Closer Filtering)
Samples the shadow map multiple times in a grid pattern to soften edges.

- `Filter Size` - The size of the sample grid, from 1 to 16. Higher values are softer but more expensive.
- `Depth Bits` - Shadow map precision. Use 32 unless you have a specific reason to use 16.
- `Enable PCSS` - Enables Percentage Closer Soft Shadows, which makes shadow softness scale with distance from the caster. When enabled, exposes:
  - `Blocker Search Count` - Number of samples used to find shadow blockers.
  - `Blocker Search Size` - Area searched for blockers.
  - `Light Size` - Controls how wide the virtual light source is, which affects penumbra size.
  - `Minimum Penumbra Size` - Sets a floor on how sharp shadows can get up close.

### PCF Tent
A variant of PCF that uses a tent filter instead of a uniform grid. Generally smoother results at similar cost.

- `Tent Size` - Options are 3, 5, or 7 taps.
- `Depth Bits` - Shadow map precision.

### EVSM (Exponential Variance Shadow Maps)
Stores shadow depth statistically, allowing much wider blur with fewer artifacts than PCF. Best for very soft shadows.

- `Positive Exponential Constant` / `Negative Exponential Constant` - Controls the exponent used when storing depth. Higher values increase precision near shadow edges.
- `Kawase Blur Iterations` - Number of blur passes. 0 means no blur. More passes = softer shadows.
- `Kawase Downsample Factor` - Downsamples the shadow map before blurring to reduce cost. Options are None, Half, Quarter, and Eighth.
- `Mip Blur Factor` - Blends between mip levels of the shadow map for an additional softening effect.
- `Aniso Level` - Anisotropic filtering level on the shadow texture.

---

SofterShadows

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