NoDraw QML Type

当 FrameGraph 分支中出现 NoDraw 节点时，渲染器将无法渲染任何基元。更多

Import Statement:	`import Qt3D.Render 2.9`
In C++:	QNoDraw
Inherits:	FrameGraphNode
Status:	Deprecated

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详细说明

当 FrameGraph 需要设置一些渲染状态或清除一些缓冲区而不需要绘制任何网格时，应使用 NoDraw。其效果与Qt3DRender::QRenderPassFilter 的效果相同，该与场景中任何可用的Qt3DRender::QRenderPass 实例都不匹配，而不会产生实际执行过滤的开销成本。

禁用 NoDraw 节点时，不会阻止渲染场景。因此，切换启用属性是使 NoDraw 处于活动或非活动状态的一种方法。

NoDraw 通常作为ClearBuffers 节点的子节点使用，以防止在多次渲染时绘制场景。

Viewport {
    CameraSelector {
        ClearBuffers {
            buffers: ClearBuffers.ColorDepthBuffer
            NoDraw { } // Prevents from drawing anything
        }
        RenderPassFilter {
            ...
        }
        RenderPassFilter {
            ...
        }
    }
}

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