我们可以在SceneKit中的透明平面上渲染阴影 [英] Can we render shadow on a transparent Plane in SceneKit

问题描述

我已经为Plane使用了着色器修改器，但它不起作用。任何人都可以建议我如何解决它？

I have used shader modifiers for Plane but its not working. Can anyone suggest me how to solve it?

let myShaderfragment = "#pragma transparent;\n" + "_output.color.a = 0.0;"
let myShaderSurface = "#pragma transparent;\n" + "_surface.diffuse.a = 0.0;"
 material.shaderModifiers = [SCNShaderModifierEntryPoint.fragment : myShaderfragment, SCNShaderModifierEntryPoint.surface : myShaderSurface]

推荐答案

SceneKit ：WWDC 2017的新内容会议解释了如何做到这一点。

The SceneKit: What's New session from WWDC 2017 explains how to do that.

1. 对于飞机，使用 常量 lightingModel 。这是最便宜的。


2. 此资料将包含 writesToDepthBuffer 设置为 true 和 colorBufferWriteMask 设置为 [] （空选项集）。这样平面将在深度缓冲区中写入，但不会在屏幕上绘制任何内容。


3. 设置灯光 shadowMode 到 deferred ，以便在渲染对象本身时不应用阴影，而是作为最终的后期处理。

1. For the plane, use a material with constant as its lightingModel. It's the cheapest one.
2. This material will have writesToDepthBuffer set to true and colorBufferWriteMask set to [] (empty option set). That way the plane will write in the depth buffer, but won't draw anything on screen.
3. Set the light's shadowMode to deferred so that shadows are not applied when rendering the objects themselves, but as a final post-process.

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