KBE3D / KBCore / Cesium / GeometryAttribute

类: GeometryAttribute

Values and type information for geometry attributes. A Geometry generally contains one or more attributes. All attributes together form the geometry's vertices.

示例

const geometry = new Cesium.Geometry({
  attributes : {
    position : new Cesium.GeometryAttribute({
      componentDatatype : Cesium.ComponentDatatype.FLOAT,
      componentsPerAttribute : 3,
      values : new Float32Array([
        0.0, 0.0, 0.0,
        7500000.0, 0.0, 0.0,
        0.0, 7500000.0, 0.0
      ])
    })
  },
  primitiveType : Cesium.PrimitiveType.LINE_LOOP
});

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 values for the attributes stored in a typed array.

属性

componentDatatype

componentDatatype: ComponentDatatype

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

---

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

attribute.componentDatatype = Cesium.ComponentDatatype.FLOAT;
attribute.componentsPerAttribute = 3;
attribute.values = new Float32Array([
  0.0, 0.0, 0.0,
  7500000.0, 0.0, 0.0,
  0.0, 7500000.0, 0.0
]);

---

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.values = new Uint8Array([
  Cesium.Color.floatToByte(color.red),
  Cesium.Color.floatToByte(color.green),
  Cesium.Color.floatToByte(color.blue),
  Cesium.Color.floatToByte(color.alpha)
]);

---

values

values: number[] | Float32Array<ArrayBufferLike> | Int8Array<ArrayBufferLike> | Uint8Array<ArrayBufferLike> | Int16Array<ArrayBufferLike> | Uint16Array<ArrayBufferLike> | Int32Array<ArrayBufferLike> | Uint32Array<ArrayBufferLike> | Float64Array<ArrayBufferLike>

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

attribute.componentDatatype = Cesium.ComponentDatatype.FLOAT;
attribute.componentsPerAttribute = 3;
attribute.values = new Float32Array([
  0.0, 0.0, 0.0,
  7500000.0, 0.0, 0.0,
  0.0, 7500000.0, 0.0
]);

构造函数

构造函数

new GeometryAttribute(options?: { componentDatatype: ComponentDatatype; componentsPerAttribute: number; values: number[] | Float32Array<ArrayBufferLike> | Int8Array<ArrayBufferLike> | Uint8Array<ArrayBufferLike> | Int16Array<ArrayBufferLike> | Uint16Array<ArrayBufferLike> | Int32Array<ArrayBufferLike> | Uint32Array<ArrayBufferLike> | Float64Array<ArrayBufferLike>; normalize?: boolean; }): GeometryAttribute

参数

options?

componentDatatype

ComponentDatatype

componentsPerAttribute

number

values

number[] | Float32Array<ArrayBufferLike> | Int8Array<ArrayBufferLike> | Uint8Array<ArrayBufferLike> | Int16Array<ArrayBufferLike> | Uint16Array<ArrayBufferLike> | Int32Array<ArrayBufferLike> | Uint32Array<ArrayBufferLike> | Float64Array<ArrayBufferLike>

normalize?

boolean

返回

GeometryAttribute