# PolylineColorAppearance

#### new Cesium.PolylineColorAppearance(options)
engine/Source/Scene/PolylineColorAppearance.js 52

An appearance for `GeometryInstance` instances with color attributes and `PolylineGeometry` or `GroundPolylineGeometry`. This allows several geometry instances, each with a different color, to be drawn with the same `Primitive`.

Name | Type | Description
--- | --- | ---
`options` | object | optional Object with the following properties:
Name | Type | Default | Description
--- | --- | --- | ---
`translucent` | boolean | `true` | optional When `true`, the geometry is expected to appear translucent so `PolylineColorAppearance#renderState` has alpha blending enabled.
`vertexShaderSource` | string |  | optional Optional GLSL vertex shader source to override the default vertex shader.
`fragmentShaderSource` | string |  | optional Optional GLSL fragment shader source to override the default fragment shader.
`renderState` | object |  | optional Optional render state to override the default render state.

##### Example:

    // A solid white line segment
    const primitive = new Cesium.Primitive({
      geometryInstances : new Cesium.GeometryInstance({
        geometry : new Cesium.PolylineGeometry({
          positions : Cesium.Cartesian3.fromDegreesArray([
            0.0, 0.0,
            5.0, 0.0
          ]),
          width : 10.0,
          vertexFormat : Cesium.PolylineColorAppearance.VERTEX_FORMAT
        }),
        attributes : {
          color : Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(1.0, 1.0, 1.0, 1.0))
        }
      }),
      appearance : new Cesium.PolylineColorAppearance({
        translucent : false
      })
    });

### Members

#### static constant Cesium.PolylineColorAppearance.VERTEX_FORMAT : VertexFormat
engine/Source/Scene/PolylineColorAppearance.js 191

The `VertexFormat` that all `PolylineColorAppearance` instances are compatible with. This requires only a `position` attribute.

#### readonly closed : boolean
engine/Source/Scene/PolylineColorAppearance.js 158

When `true`, the geometry is expected to be closed so `PolylineColorAppearance#renderState` has backface culling enabled. This is always `false` for `PolylineColorAppearance`.

Default Value: `false`

#### readonly fragmentShaderSource : string
engine/Source/Scene/PolylineColorAppearance.js 122

The GLSL source code for the fragment shader.

#### material : Material
engine/Source/Scene/PolylineColorAppearance.js 67

This property is part of the `Appearance` interface, but is not used by `PolylineColorAppearance` since a fully custom fragment shader is used.

Default Value: `undefined`

#### readonly renderState : object
engine/Source/Scene/PolylineColorAppearance.js 140

The WebGL fixed-function state to use when rendering the geometry.

The render state can be explicitly defined when constructing a `PolylineColorAppearance` instance, or it is set implicitly via `PolylineColorAppearance#translucent`.

#### translucent : boolean
engine/Source/Scene/PolylineColorAppearance.js 77

When `true`, the geometry is expected to appear translucent so `PolylineColorAppearance#renderState` has alpha blending enabled.

Default Value: `true`

#### readonly vertexFormat : VertexFormat
engine/Source/Scene/PolylineColorAppearance.js 176

The `VertexFormat` that this appearance instance is compatible with. A geometry can have more vertex attributes and still be compatible - at a potential performance cost - but it can't have less.

Default Value: ``PolylineColorAppearance.VERTEX_FORMAT``

#### readonly vertexShaderSource : string
engine/Source/Scene/PolylineColorAppearance.js 108

The GLSL source code for the vertex shader.

### Methods

#### getFragmentShaderSource() → string
engine/Source/Scene/PolylineColorAppearance.js 200

Procedurally creates the full GLSL fragment shader source.

##### Returns:

The full GLSL fragment shader source.

#### getRenderState() → object
engine/Source/Scene/PolylineColorAppearance.js 222

Creates a render state. This is not the final render state instance; instead, it can contain a subset of render state properties identical to the render state created in the context.

##### Returns:

The render state.

#### isTranslucent() → boolean
engine/Source/Scene/PolylineColorAppearance.js 210

Determines if the geometry is translucent based on `PolylineColorAppearance#translucent`.

##### Returns:

`true` if the appearance is translucent.

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