UE4在VR模式下去掉两侧黑边

正常用VR模式打开以后，就会成这样：

红框部分就是我所说的黑边

通过改变代码，可以实现如下效果：

我们同样要在编译版的UE4下操作，这样才能重新编译到源文件（UE4源文件下载和编译请参见我上一篇文章）

在SteamVRRender.cpp里的RenderTexture_RenderThread函数修改：

修改为：

void FSteamVRHMD::RenderTexture_RenderThread(FRHICommandListImmediate& RHICmdList, FTexture2DRHIParamRef BackBuffer, FTexture2DRHIParamRef SrcTexture) const
{
	check(IsInRenderingThread());

	if (WindowMirrorMode == 0)
	{
		return;
	}

	const uint32 ViewportWidth = BackBuffer->GetSizeX();
	const uint32 ViewportHeight = BackBuffer->GetSizeY();

	SetRenderTarget(RHICmdList, BackBuffer, FTextureRHIRef());
	RHICmdList.SetViewport(0, 0, 0, ViewportWidth, ViewportHeight, 1.0f);

	RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
	RHICmdList.SetRasteri