GpuMaterialPassDepthWrite Property

public bool DepthWrite { get; set; }

Property Value

If depth-buffer writing is on, whenever a pixel is written to the frame buffer the depth buffer is updated with the depth value of that new pixel, thus affecting future rendering operations if future pixels are behind this one.

If depth writing is off, pixels are written without updating the depth buffer Depth writing should normally be on but can be turned off when rendering static backgrounds or when rendering a collection of transparent objects at the end of a scene so that they overlap each other correctly.

Reference