Depth Test Fail

Oliver · 2013-06-09T19:23:55

Hi there, At the moment the 2D editor I'm working on is using draw order to define the visual depth of objects, but I'm trying to switch this over to a depth test so I can apply some post processing effects (like depth of field and ambient occlusion). Trouble is that if the depth that I render the objects is isn't set to -1.0f, nothing is drawn. I must be missing something obvious here, so if I could get a second set of eyes that would be most helpful! Unfortunately I can't use pix as the xna window is in a WinFormsHost control in a WPF application... it can't pick up on any draw calls. OK my depth/stencil state is set up like this (I'm using the stencil buffer to work out which objects I should apply light-maps to): myColourTarget = new RenderTarget2D( aGraphicsDevice, width, height, false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8 ); myLightingEnabledState = new DepthStencilState(); myLightingEnabledState.StencilEnable = true; myLightingEnabledState.StencilFunction = CompareFunction.Always; myLightingEnabledState.StencilPass = StencilOperation.Replace; myLightingEnabledState.ReferenceStencil = 1; myLightingEnabledState.DepthBufferEnable = true; I'm setting up the world/view matrices as follows, with a near plane of 0.0f and a far plane of -10.0f. The view matrix here is just an identity matrix (and I'll be caching the matrix calculation at a later stage): // Set up the main object rendering effect Effect objectEffect = effectManager.GetEffect( myEngineObjectEffectID ); objectEffect.Parameters["View"].SetValue( currentCamera.View); objectEffect.Parameters["Projection"].SetValue(Matrix.CreateOrthographicOffCenter(0.0f, graphicsDevice.Viewport.Width, graphicsDevice.Viewport.Height, 0.0f, 0.0f, -10.0f)); graphicsDevice.SetRenderTarget( myColourTarget ); graphicsDevice.Clear( ClearOptions.DepthBuffer | ClearOptions.Stencil | ClearOptions.Target, ClearColor, 0.0f, 0 ); The world matrix is set based on the type of object being rendered (to account for parallax scrolling in the foreground/background): anEffect.Parameters["World"].SetValue( aCamera.GetParallaxWorld(currentScene.CentralParallax) ); ... myWorld = Matrix.CreateTranslation(new Vector3(-myPosition, 1.0f)) * // Position Matrix.CreateRotationZ(myRotation) * // Rotation Matrix.CreateScale(new Vector3(myZoom, myZoom, 1.0f)); // Scale And when I draw my objects with a depth of 0.5f, everything gets culled: Vector2 objectCenter = new Vector2(aComponentObject.Size.X / 2.0f, aComponentObject.Size.Y / 2.0f); aSpriteBatch.Draw( aTextureManager.GetTexture(graphicComponent.ColourMap), aComponentObject.Position, null, drawColour, aComponentObject.Rotation, objectCenter, aComponentObject.Scale, SpriteEffects.None, -0.5f ); So as far as I can tell I should have an orthographic camera, positioned at (x,y,1.0f) with a near plane of 0.0f and a far plane of -10.0f... but the depth tests are failing with depth set to -0.5f. Any ideas what I'm doing wrong here? The odd thing is if I have the depth set to -10.0 (right on the far view plane) in the sprite batch call, everything renders without any problems. The vertex shader I'm using dead simple : VertexShaderOutput VS( VertexShaderInput input ) { VertexShaderOutput output; float4 worldPosition = mul(input.myPosition, World); float4 viewPosition = mul(worldPosition, View); output.myPosition = mul(viewPosition, Projection); output.myTexCoord = input.myTexCoord; output.myColour = input.myColour; return output; } Thanks for the help!

Graphics and GPU Programming Programming

Started by Capoeirista June 08, 2013 04:43 PM

9 comments, last by Capoeirista 10 years, 10 months ago

Capoeirista

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Author

June 09, 2013 07:23 PM

The problem is your near plane of 0. For an ortho matrix you can set near to a sign-flipped version of far (so for a far of -10 you'd use a near of 10) and everything should come out as expected.

Excellent point, thanks mahagian! This cleared up the last issues I was having with the rendering.

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Depth Test Fail

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Depth Test Fail

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