Function setMaterialOpacity

setMaterialOpacity(material, opacity, opts?): any
设置材质透明
Parameters
- material: Material | Material[] | Mesh<BufferGeometry<NormalBufferAttributes>, Material | Material[], Object3DEventMap>
- opacity: number
  透明度
- Optional opts: {
      disposeOldMaterial?: boolean;
      isAccOpacity?: boolean;
      isClone?: boolean;
  }
  isAccOpacity 是否累加透明度(ture和之前透明度相乘，false直接设置透明度), isClone 是否克隆成新的材质 disposeOldMaterial 当克隆时是否删除旧的材质
  - Optional disposeOldMaterial?: boolean
  - Optional isAccOpacity?: boolean
  - Optional isClone?: boolean
Returns any