Cesium JS API
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createTangentSpaceDebugPrimitive

createTangentSpaceDebugPrimitive函数用于创建一个调试用的切线空间三角形网格Primitive,用来表示切线空间在模型表面的方向和值,该函数属于Cesium3D开源JavaScript库。

参数

参数 类型 描述
options Object 可选参数,包括以下属性:
options.geometry Geometry 必需参数,表示三角形形状的Geometry。
options.attributeName String 可选参数,表示包含切线和副法线信息的属性名,默认为“TANGENT”。
options.length Number 可选参数,表示切线和副法线线长的倍数,默认为1。

返回值

类型 描述
Primitive 一个切线空间三角形网格Primitive。

用法

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,
                100000.0, 0.0, 0.0,
                0.0, 100000.0, 0.0
            ])
        }),
        normal: new Cesium.GeometryAttribute({
            componentDatatype: Cesium.ComponentDatatype.FLOAT,
            componentsPerAttribute: 3,
            values: new Float32Array([
                0.0, 0.0, 1.0,
                0.0, 0.0, 1.0,
                0.0, 0.0, 1.0
            ])
        }),
        tangent: new Cesium.GeometryAttribute({
            componentDatatype: Cesium.ComponentDatatype.FLOAT,
            componentsPerAttribute: 3,
            values: new Float32Array([
                1.0, 0.0, 0.0,
                1.0, 0.0, 0.0,
                1.0, 0.0, 0.0
            ])
        }),
        st: new Cesium.GeometryAttribute({
            componentDatatype: Cesium.ComponentDatatype.FLOAT,
            componentsPerAttribute: 2,
            values: new Float32Array([
                0.0, 0.0,
                1.0, 0.0,
                0.0, 1.0
            ])
        })
    },
    indices: new Uint32Array([0, 1, 2]),
    primitiveType: Cesium.PrimitiveType.TRIANGLE_STRIP
});

const tangentSpaceDebugPrimitive = Cesium.createTangentSpaceDebugPrimitive({
    geometry: geometry,
    attributeName: 'TANGENT',
    length: 10
});

viewer.scene.primitives.add(tangentSpaceDebugPrimitive);

异常

如果options.geometry不提供或者不是一个Geometry,则会抛出异常“options.geometry是必需参数,且必须是Geometry。”。

参考