将SCNGeometry渲染为线框 [英] Render an SCNGeometry as a wireframe

查看：82 发布时间：2020/11/10 20:04:42 ios shader fragment-shader scenekit

本文介绍了将SCNGeometry渲染为线框的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

我在iOS上使用SceneKit，并且有一个要渲染为线框的几何.所以基本上我只想绘制线条，所以不画纹理.

I'm using SceneKit on iOS and I have a geometry I want to render as a wireframe. So basically I want to draw only the lines, so no textures.

我发现我可以使用所用SCNMaterial的shaderModifiers属性来完成此任务.着色器修改器的示例:

I figured out that I could use the shaderModifiers property of the used SCNMaterial to accomplish this. Example of a shader modifier:

material.shaderModifiers = [
    SCNShaderModifierEntryPointFragment: "_output.color.rgb = vec3(1.0) - _output.color.rgb;"
]

此示例显然简单地反转了输出颜色.对于着色器片段必须使用的"GLSL"语言，我一无所知.

This example apparently simply inverts the output colors. I know nothing about this 'GLSL' language I have to use for the shader fragment.

有人能告诉我应该使用什么代码作为着色器片段，以便仅在边缘附近绘制，以使几何图形看起来像线框吗?

Can anybody tell me what code I should use as the shader fragment to only draw near the edges, to make the geometry look like a wireframe?

或者也许还有其他方法可以将几何图形渲染为线框.我很想听听.

Or maybe there is a whole other approach to render a geometry as a wireframe. I would love to hear it.