Question

I’m drawing several models, with the following code to set up render states:

GraphicsDevice.BlendState = BlendState.Opaque;
GraphicsDevice.DepthStencilState = DepthStencilState.Default;
GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise;
GraphicsDevice.SamplerStates[0] = SamplerState.LinearWrap;

Some models rendered not correctly. If I change one line of code:

GraphicsDevice.DepthStencilState = DepthStencilState.DepthRead;

Now, others don’t work correctly. I used 2 codes with each code segment but it still doesn’t work.

How can i fix this rendering issue?

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Screenshots:

I’m drawing the ground first, then the ‘road’ models.

Top: https://i.stack.imgur.com/xH8qp.png

When I change angle of the camera…: https://i.stack.imgur.com/Nbw3m.png

Answer 1

Your problem looks to be Z-Fighting, a problem that is caused by trying to render 2 or more polygons at the same distance from the camera.

When drawing the models you could disable the Z-buffer. DepthStencilState.None