forked from BilalY/Rasagar
97 lines
5.5 KiB
Markdown
97 lines
5.5 KiB
Markdown
# Use decals
|
||
|
||
The High Definition Render Pipeline (HDRP) includes the following ways to create decals in a Scene.
|
||
|
||
- Use a Decal Mesh and manually position the decal.
|
||
|
||
- Use the [Decal Projector](Decal-Projector.md) component to project the decal.
|
||
|
||
To use these methods, you need to create a decal Material. A decal Material is a Material that uses the [Decal Shader](Decal-Shader.md) or [Decal Master Stack](master-stack-decal.md). You can then place or project your decal Material into a Scene.
|
||
|
||
|
||
|
||
## Decal Layers
|
||
|
||
HDRP includes Decal Layers that you can use to specify which Materials a decal affects based on which layer you assign it to.
|
||
|
||
### Enabling Decal Layers
|
||
|
||
To use Decal Layers, enable them in your Project’s [HDRP Asset](HDRP-Asset.md). To do this:
|
||
1. Navigate to the **Project** window and open your HDRP Asset.
|
||
2. In the Inspector, open the **Decals** dropdown.
|
||
3. Enable the **Layers** checkbox.
|
||
|
||
You can then enable Decal Layers in your [Frame Settings](Frame-Settings.md) to enable Decal Layers for all Cameras. To do this:
|
||
|
||
1. Go to **Edit** > **Project Settings** > **Graphics** > **Pipeline Specific Settings** > **HDRP**.
|
||
2. Go to the **Frame Settings (Default Values**) > **Camera** section.
|
||
3. Open the **Rendering** section.
|
||
4. Enable the **Decal Layers** checkbox.
|
||
|
||
To control the Frame Settings and set Decal Layers for a specific Camera:
|
||
|
||
1. Click on a Camera in the Scene view or Hierarchy window to view its properties in the Inspector.
|
||
2. Go to the **Rendering** section and enable the **Custom Frame Settings** checkbox. This opens a new **Frame Settings Overrides** section, which you can use to customize this Camera.
|
||
3. In the **Frame Settings Overrides** section open the **Rendering** section.
|
||
4. Enable the **Decal Layers** checkbox.
|
||
|
||
### Using Decal Layers
|
||
|
||
When you enable Decal Layers, a Decal only affects a Mesh Renderer or Terrain if they both use a matching Rendering Layer. You can use Decal Layers to separate Meshes from specific [Decal Projectors](decal-projector-reference.md) in your Scene. To do this:
|
||
|
||
1. Click on a Decal Projector in the Hierarchy or the Scene view to view it in the Inspector.
|
||
2. Use the **Rendering Layer Mask** property drop-down to select which Rendering Layers this Decal Projector affects.
|
||
4. Click on a Mesh Renderer or Terrain in the Hierarchy or the Scene view to view it in the Inspector.
|
||
5. Use the **Rendering Layer Mask** drop-down (See [MeshRenderer](https://docs.unity3d.com/Manual/class-MeshRenderer.html) for GameObjects or [OtherSettings](https://docs.unity3d.com/Manual/terrain-OtherSettings.html) for Terrain) to select which Decal Layers affect this Mesh Renderer or Terrain.
|
||
|
||
To rename a Rendering Layer, see [Renaming rendering Layers](Rendering-Layers.md#renaming-rendering-layers).
|
||
|
||
### How Decal Layers affect performance
|
||
|
||
When you enable Decal Layers, it increases the build time of your project. This is because Decal Layers:
|
||
|
||
* Uses a high amount of memory.
|
||
* Increases GPU performance cost.
|
||
* Generates more [Shader Variants](https://docs.unity3d.com/Manual/shader-variants.html).
|
||
|
||
HDRP renders Material depth in a Depth Prepass to apply decals to opaque Materials. This increases resource use on the CPU. Only Materials that have the **Receive Decals** property enabled render in the Depth Prepass, unless you force a full Depth Prepass. To prevent HDRP from rendering a Material which shouldn't receive Decals in the Depth Prepass:
|
||
|
||
1. Open the Material assigned to a Mesh Renderer or Terrain that you do not want to display decals on.
|
||
|
||
2. Disable the **Receive Decals** property.
|
||
|
||
**Note:** When you use the **Rendering Layer Mask** of a Mesh Renderer or Terrain to disable decal on a specific Decal Layer, it doesn't affect your application's performance.
|
||
|
||
|
||
<a name="additive-normal-blending"></a>
|
||
## Additive Normal Blending
|
||
|
||
You can use Additive normal blending to blend decal normals with the normals of a specific GameObject.
|
||
In the following image examples, the screenshot on the left doesn't use additive normal blending, and the screenshot on the right uses additive normal blending.
|
||
|
||
|
||
|
||
To use Additive Normal Blending:
|
||
1. Open your Project’s [HDRP Asset](HDRP-Asset.md).
|
||
2. In the Inspector, go to **Rendering** >**Decals** and enable the **Additive Normal Blending** checkbox.
|
||
|
||
### High Precision Normal Buffer
|
||
|
||
When you use additive normal blending, HDRP constrains the decal displacement to a cone of 45° around the object normal to reduce banding artifacts.
|
||
To remove this angle constraint on the normal at the cost of a higher memory usage, enable the High Precision Normal Buffer setting. To do this:
|
||
|
||
1. Select your Project’s [HDRP Asset](HDRP-Asset.md).
|
||
2. In the Inspector, go to **Rendering** > **Decals** and enable the **High Precision Normal Buffer** checkbox.
|
||
|
||
## Limitations
|
||
|
||
- The Decal Shader does not support emissive on Transparent Materials and does support Decal Layers.
|
||
|
||
- Decal Meshes can only affect opaque Materials with either a [Decal Shader](Decal-Shader.md) or a [Decal Master Stack](master-stack-decal.md).
|
||
|
||
- Decal Meshes do not support Decal Layers.
|
||
|
||
- A Decal Projector can only affect transparent Materials when you enable the **Affect Transparent** checkbox.
|
||
|
||
- With [Lit Shader Mode](Frame-Settings.md) setup to **Deferred**. Decals projected on objects relying on object motion vectors (Deformed objects) can exhibit artifacts like being visible even if not in the projector frustrum. This can be fixed by enabling **Full Depth Prepass within Deferred** option in [FrameSettings](Frame-Settings.md).
|