原理说明：

WebGPU提供了绘制基本线条非机制，只要render pipeline primitive对应的 topology属性指定为line-list或者line-strip即可绘制对应的线条。

当前示例源码github地址:

https://github.com/vilyLei/voxwebgpu/blob/feature/rendering/src/voxgpu/sample/LineEntityTest.ts

当前示例运行效果:

WGSL顶点着色器代码：

@group(0) @binding(0) var<uniform> objMat : mat4x4<f32>;
@group(0) @binding(1) var<uniform> viewMat : mat4x4<f32>;
@group(0) @binding(2) var<uniform> projMat : mat4x4<f32>;struct VertexOutput {@builtin(position) Position : vec4<f32>,@location(0) vertColor : vec4<f32>
}
@vertex
fn main(@location(0) position : vec3<f32>,@location(1) color : vec3<f32>,
) -> VertexOutput {let wpos = objMat * vec4(position.xyz, 1.0);var output : VertexOutput;output.Position = projMat * viewMat * wpos;output.vertColor = vec4f(color.xyz, 1.0);return output;
}

WGSL片段着色器代码：

@group(0) @binding(3) var<uniform> color: vec4f;
@fragment
fn main(@location(0) vertColor: vec4<f32>
) -> @location(0) vec4<f32> {var color4 = vertColor * color;return color4;
}

此示例基于此渲染系统实现，当前示例TypeScript源码如下:

export class LineEntityTest {private mRscene = new RendererScene();initialize(): void {this.initEvent();this.initScene();}private initEvent(): void {const rc = this.mRscene;new MouseInteraction().initialize(rc, 0, false).setAutoRunning(true);}private initScene(): void {const rsc = this.mRscene;let linePositions = [new Vector3(), new Vector3(-100), new Vector3(-150, -180), new Vector3(-150, -180, -100)];let line = new Line3DEntity({linePositions});line.setColor([1.0,0.0,0.0]);rsc.addEntity( line );linePositions = [new Vector3(), new Vector3(100), new Vector3(150, 180), new Vector3(150, 180, 100)];let lineColors = [new Color4(1.0), new Color4(0.0,1.0), new Color4(0.0,0.0,1.0), new Color4(1.0,0.0,1.0)];let colorLine = new Line3DEntity({linePositions, lineColors});rsc.addEntity( colorLine );}run(): void {this.mRscene.run();}
}