---
title: "init(color:texture:)"
framework: realitykit
role: symbol
role_heading: Initializer
path: "realitykit/physicallybasedmaterial/emissivecolor-swift.struct/init(color:texture:)-5hl9i"
---

# init(color:texture:)

Creates a color of emitted light in iOS.

## Declaration

```swift
init(color: NSColor = .black, texture: MaterialParameters.Texture? = nil)
```

## Parameters

- `color`: The color of the emitted light. Defaults to black.
- `texture`: An optional UV-mapped image texture.

## Discussion

Discussion This initializer creates an object from a color, an image texture, or from both. The color property defaults to black, which results in no light emissions. With custom materials, color and texture are available as inputs in your surface shader, but your surface shader must call params.surface().set_emissive_color(), otherwise RealityKit renders no light emission. The following Metal code demonstrates how to replicate the emissive behavior of PhysicallyBasedMaterial in your surface shader code:     // Retrieve the emissive color tint from the CustomMaterial.     half3 emissiveColorTint = (half3)params.material_constants()                               .emissive_color_tint();

// Retrieve the primary texture coordinates.     float2 uv = params.geometry().uv0();

// Flip the UV coordinate’s y-axis. You only need to do this     // for models you load from USDZ or .reality files.     uv.y = 1.0 - uv.y;

auto tex = params.textures();     half3 color = (half3)tex.emissive_color()                   .sample(textureSampler, uv).rgb;

// Multiply the tint and the sampled value from the texture,     // and assign the result to the shader's emissive color     // property.     color *= emissiveColorTint;     params.surface().set_emissive_color(color); note: Unlike PhysicallyBasedMaterial, CustomMaterial has no emissiveIntensity value. If you need to pass an emissive intensity value to your surface shader, use the custom property or another unused attribute property.

## See Also

### Creating an emissive color object

- [init(color:texture:)](realitykit/physicallybasedmaterial/emissivecolor-swift.struct/init(color:texture:)-3dtam.md)
- [init(_:)](realitykit/physicallybasedmaterial/emissivecolor-swift.struct/init(_:).md)