KBE3D / KBCore / Cesium / GeometryInstanceAttribute

类: GeometryInstanceAttribute

Values and type information for per-instance geometry attributes.

示例

const instance = new Cesium.GeometryInstance({
  geometry : Cesium.BoxGeometry.fromDimensions({
    dimensions : new Cesium.Cartesian3(1000000.0, 1000000.0, 500000.0)
  }),
  modelMatrix : Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(
    Cesium.Cartesian3.fromDegrees(0.0, 0.0)), new Cesium.Cartesian3(0.0, 0.0, 1000000.0), new Cesium.Matrix4()),
  id : 'box',
  attributes : {
    color : new Cesium.GeometryInstanceAttribute({
      componentDatatype : Cesium.ComponentDatatype.UNSIGNED_BYTE,
      componentsPerAttribute : 4,
      normalize : true,
      value : [255, 255, 0, 255]
    })
  }
});

参数

Object with the following properties:

参数

The datatype of each component in the attribute, e.g., individual elements in values.

参数

A number between 1 and 4 that defines the number of components in an attributes.

参数

When <code>true</code> and <code>componentDatatype</code> is an integer format, indicate that the components should be mapped to the range [0, 1] (unsigned) or [-1, 1] (signed) when they are accessed as floating-point for rendering.

参数

The value for the attribute.

属性

componentDatatype

componentDatatype: ComponentDatatype

The datatype of each component in the attribute, e.g., individual elements in GeometryInstanceAttribute#value.

---

componentsPerAttribute

componentsPerAttribute: number

A number between 1 and 4 that defines the number of components in an attributes. For example, a position attribute with x, y, and z components would have 3 as shown in the code example.

示例

show : new Cesium.GeometryInstanceAttribute({
  componentDatatype : Cesium.ComponentDatatype.UNSIGNED_BYTE,
  componentsPerAttribute : 1,
  normalize : true,
  value : [1.0]
})

---

normalize

normalize: boolean

When <code>true</code> and <code>componentDatatype</code> is an integer format, indicate that the components should be mapped to the range [0, 1] (unsigned) or [-1, 1] (signed) when they are accessed as floating-point for rendering. <p> This is commonly used when storing colors using ComponentDatatype.UNSIGNED_BYTE. </p>

示例

attribute.componentDatatype = Cesium.ComponentDatatype.UNSIGNED_BYTE;
attribute.componentsPerAttribute = 4;
attribute.normalize = true;
attribute.value = [
  Cesium.Color.floatToByte(color.red),
  Cesium.Color.floatToByte(color.green),
  Cesium.Color.floatToByte(color.blue),
  Cesium.Color.floatToByte(color.alpha)
];

---

value

value: number[]

The values for the attributes stored in a typed array. In the code example, every three elements in <code>values</code> defines one attributes since <code>componentsPerAttribute</code> is 3.

示例

show : new Cesium.GeometryInstanceAttribute({
  componentDatatype : Cesium.ComponentDatatype.UNSIGNED_BYTE,
  componentsPerAttribute : 1,
  normalize : true,
  value : [1.0]
})

构造函数

构造函数

new GeometryInstanceAttribute(options: { componentDatatype: ComponentDatatype; componentsPerAttribute: number; value: number[]; normalize?: boolean; }): GeometryInstanceAttribute

参数

options

componentDatatype

ComponentDatatype

componentsPerAttribute

number

value

number[]

normalize?

boolean

返回

GeometryInstanceAttribute