Hi

After porting my game engine from DX9 to DX11, I seem to have an issue with my sky box. Previously it worked fine, I do the usual box around the player and set position.w to position.z so they're both the same which should result in a z of 1.0f in the next stage.

My depth buffer works for all other graphics but when I render my sky box, depending on my view and position, I get some (what looks like) z-fighting against - nothing. Sometimes the entire skybox triangle displays correctly until I move my camera and then another one may appear with some z-fighting artifacts, sometimes they don't display at all.

If I turn depth off, the skybox renders fine. My depth buffer creation is standard I believe - I've turned off the depth stencil in the state (turning it on makes no difference). I create the depth stencil buffer like this:

		D3D11_TEXTURE2D_DESC depthBufferDesc;
		D3D11_DEPTH_STENCIL_DESC depthStencilDesc;
		D3D11_DEPTH_STENCIL_VIEW_DESC depthStencilViewDesc;

		ZeroMemory(&depthBufferDesc, sizeof(depthBufferDesc));

		// Set up the description of the depth buffer.
		depthBufferDesc.Width = width;
		depthBufferDesc.Height = height;
		depthBufferDesc.MipLevels = 1;
		depthBufferDesc.ArraySize = 1;
		depthBufferDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
		depthBufferDesc.SampleDesc.Count = 1;
		depthBufferDesc.SampleDesc.Quality = 0;
		depthBufferDesc.Usage = D3D11_USAGE_DEFAULT;
		depthBufferDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
		depthBufferDesc.CPUAccessFlags = 0;
		depthBufferDesc.MiscFlags = 0;

		// Create the texture for the depth buffer using the filled out description.
		HRESULT result = direct3DDevice->CreateTexture2D(&depthBufferDesc, NULL, &depthStencilBuffer);
		if (FAILED(result))
		{
			bool b = true;
		}

		// Initialize the description of the stencil state.
		ZeroMemory(&depthStencilDesc, sizeof(depthStencilDesc));

		// Set up the description of the stencil state.
		depthStencilDesc.DepthEnable = true;
		depthStencilDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
		depthStencilDesc.DepthFunc = D3D11_COMPARISON_LESS;

		depthStencilDesc.StencilEnable = false;
		depthStencilDesc.StencilReadMask = 0xFF;
		depthStencilDesc.StencilWriteMask = 0xFF;

		// Stencil operations if pixel is front-facing.
		depthStencilDesc.FrontFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
		depthStencilDesc.FrontFace.StencilDepthFailOp = D3D11_STENCIL_OP_INCR;
		depthStencilDesc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
		depthStencilDesc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

		// Stencil operations if pixel is back-facing.
		depthStencilDesc.BackFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
		depthStencilDesc.BackFace.StencilDepthFailOp = D3D11_STENCIL_OP_DECR;
		depthStencilDesc.BackFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
		depthStencilDesc.BackFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

		// Create the depth stencil state.
		result = direct3DDevice->CreateDepthStencilState(&depthStencilDesc, &depthStencilState);
		if (FAILED(result))
		{
			bool b = true;
		}

		// Set the depth stencil state.
		deviceContext->OMSetDepthStencilState(depthStencilState, 0);

		// Initailze the depth stencil view.
		ZeroMemory(&depthStencilViewDesc, sizeof(depthStencilViewDesc));

		// Set up the depth stencil view description.
		depthStencilViewDesc.Format = DXGI_FORMAT_D32_FLOAT;
		depthStencilViewDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
		depthStencilViewDesc.Texture2D.MipSlice = 0;

		// Create the depth stencil view.
		result = direct3DDevice->CreateDepthStencilView(depthStencilBuffer, NULL, &depthStencilView);
		if (FAILED(result))
		{
			bool b = true;
		}

Any thoughts? Here's a pic:

Thanks

@undefined thanks for the post, but coincidentally, the cube size is 100 x 100 x 100

This happened to me when a set the depth compare to less. Setting it to lessorequal calmed the fighting …

Green_Baron said:

This happened to me when a set the depth compare to less. Setting it to lessorequal calmed the fighting …

That fixed it. Thank you.