SCNProgram不影响SCNFloor [英] SCNProgram not affecting SCNFloor

问题描述

在使用shader修饰符的实验中，我发现无法将数组数据传输到shader.

In my experiments using the shader modifier, I saw that the array data could not be transferred to the shader.

Scenekit在将数组数据传递到openGL着色器中的统一数组时给出缓冲区大小错误

由于这个原因，我决定尝试SCNProgram.但是现在我意识到我使用SCNProgram添加的着色器在SCNFloor上不起作用.

For this reason I decided to try SCNProgram. But now I realize that the shaders I added using SCNProgram do not work on SCNFloor.

此问题是否有特定原因?

Is there a particular reason for this problem?

我用于测试的超级简单着色器；

Super simple shaders which I use for testing;

顶点着色器

precision highp float;
attribute vec3 vertex;
uniform mat4 ModelViewProjectionMatrix;

void main()
{
    gl_Position = ModelViewProjectionMatrix * vec4(vertex, 1.0);
}

片段着色器

precision mediump float;

void main( void )
{   
    gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
}

推荐答案

最后，Apple开发者技术支持回答了我问这个问题的问题.

Finally Apple Developer Technical Support answered the question I asked about this issue.

这是他们给出的答案.

不幸的是，没有这样的方法可以遮盖地板.这 SceneKit团队承认SCNFloor是另一种对象， 不适用于SCNProgram.此外，使用 .fragment着色器入口点也不起作用(例如:)

Unfortunately, there is not a way to shade floor as such. The SceneKit team admits that SCNFloor is a different kind of object that is not intended for use with SCNProgram. Furthermore, using the .fragment shader entry point does not work either (such as:)

func setFragmentEntryPoint( _ node: SCNNode ) {

    print( #function + " setting fragment entry point for \(node)" )

    DispatchQueue.main.asyncAfter( deadline: DispatchTime.now() + DispatchTimeInterval.milliseconds( 2500 ) ) {

        let geometry = node.geometry!

        let dict: [SCNShaderModifierEntryPoint:String] = [.fragment :
            "_output.color = vec4( 0.0, 1.0, 0.0, 1.0 );"]

        geometry.shaderModifiers = dict


    }
}

尽管SceneKit团队认为此行为是预期的，但您 可能仍会提交错误报告，在这种情况下，错误报告将被解释为 API增强请求.

Though the SceneKit team considered this behavior to be expected, you may still file a bug report which in this case will be interpreted as an API enhancement request.

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