Depth buffer stores a depth (z-coordinate) of a rendered pixel of a 3D scene. Depth buffer is used in Z-buffering (management of image depth coordinates). Because of this depth buffer is often called Z-buffer.

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2
votes
1answer
40 views

Disable depth testing for only some faces

I have some meshes and I need to be able to draw some part of them without depth test. Is it possible to turn off depth testing from within shader, wo that some parts will be rendered no matter what ...
3
votes
1answer
67 views

Self occluding object and alpha blending

Look at the object I've rendered with my app: It's the same screen twice, above the original and below I've drawn (by hand :P) the shape of the mesh of one of plant's leaves. You can clearly see ...
1
vote
2answers
56 views

Layer depth problem

I try to create Puzzle JigSaw,and I want to display the selected piece on the first layer, the pieces that are on the original positions(solved) on the last layer and the others on the middle. I ...
0
votes
1answer
72 views

OpenGL Reconstructing Position from Depth

I know this has been asked a lot of time before but none of those answers fixed my problem. I try to implement deferred shading and to do so I need to reconstruct the world space position from the ...
0
votes
0answers
44 views

OpenGL - How to use depth checking and alpha blending at the same time? [duplicate]

Suppose I have a semi-transparent object (let's call this "bubble"), a solid object (let's call this "wall"), and the bubble is closer to the camera compared to the wall behind it. If I draw the ...
5
votes
1answer
182 views

overlapping 3d particles not blending nicely when at the same z

I'm working on a 3d particle emitter. It's going pretty good but I'm still having a problem with triangle sorting. As you can see in the photos, there are some particles that are not blending ...
1
vote
0answers
72 views

Depth write and depth test in Unity

Scenario: several objects (o1, o2,.., on) have to be rendered with the z test disable, but the z values must be written to the depth buffer. In another pass, some other objects (t1, t2,..., tm) need ...
1
vote
2answers
121 views

IsoMetric Map draw: sort with Topological Sort, Z-Buffer and anchor point

I'm writing an IsoMetric renderer for my html5 isometric game. The isometric renderer should be able to render objects with floating point coordinates. DEMO: http://matt93.altervista.org/game/ ...
2
votes
1answer
87 views

How to best utilize depth buffer precision

Are there strategies to minimize depth buffer precision problems with hyperbolic depth buffers, such as the ones resulting from perspective projection matrices, or depth buffers in general? For ...
0
votes
1answer
54 views

Changing the maxDepth of viewport

Whenever I change the maxDepth of the viewport from 1.0 to say 300.0f (just for kicks), everything on my screen disappears. Why is that? Is there anywhere else I have to account for this change in ...
1
vote
1answer
178 views

Why does switching to fullscreen produce this graphical glitch?

I followed this tutorial and things were looking good. However, when switching to Fullscreen from 800x600 using alt-enter, I noticed an error in debug output: DXGI WARNING: IDXGISwapChain::Present: ...
0
votes
1answer
100 views

Creating a 2D texture array for depth view

Following my question here, I decided to create an 2D texture array for all of my depth screen texture so that I can use them for shadows for all my lights. I'm having an issue setting it up, I'm ...
0
votes
1answer
78 views

XNA DepthBias increases performance even when EarlyZ is turned off. Why?

My 3d scene consists of three main polygons: The first and the second polygons overlap each other (have the same World matrix and use the same geometry), the third one is perpendicular to the first ...
0
votes
1answer
162 views

How to print Depth to a Texture2D and then read it in the next pass on a shader in DirectX11

I'm programming a two-pass effect in DirectX 11 (SharpDX). It's supposed to write the depth to a texture in the first pass and then use that texture to extract data on the second one in the pixel ...
2
votes
1answer
278 views

Use depth bias for shadows in deferred shading

We are building a deferred shading engine and we have a problem with shadows. To add shadows we use two maps: the first one stores the depth of the scene captured by the player's camera and the ...
0
votes
2answers
114 views

Accesing depth buffer from shader

I read this presentation and on 6th slide I found that is not need to use multiple render targets and depth can be taken directly from depth buffer. From which version of DirectX or OpenGL can be ...
1
vote
0answers
113 views

How do you tell OpenGL ES 2.0 to use a texture as the depth buffer?

I want to render a scene with an outline post processing effect in OpenGL ES 2.0. First I render all the opaque objects. Then I use a post processing shader for silhouette detection that uses the ...
1
vote
1answer
231 views

How do I copy the depth buffer to CPU memory in Direct3D 9?

I have code in OpenGL that uses glReadPixels to copy the depth buffer to a CPU memory buffer: glReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_FLOAT, dbuf); How do I achieve the same in Direct3D? I ...
2
votes
1answer
257 views

Early Z-test / depth-test in DirectX 11

As a DirectX noob i'm trying to wrap my head around depth buffers and specifically how pixel shaders are called for obscured pixels. From what i understand, the rasterizer calls the pixel shader for ...
4
votes
1answer
603 views

using heightmap to simulate 3d in an isometric 2d game

I saw a video of an 2.5d engine that used heightmaps to do zbuffering. Is this hard to do? I have more or less no idea of Opengl(lwjgl) and that stuff. I could imagine, that you compare each pixel ...
5
votes
0answers
121 views

How to pass depth buffer from OGRE to CUDA?

I am using OGRE for rendering some objects. At every frame, I would like to pass the resulting depth buffer to CUDA for running some kernels on it and computing a result. How can I achieve this? How ...
2
votes
2answers
136 views

Direct3D9 depth write without depth test

In OpenGL and Direct3D11 depth write is disabled if depth test is disabled. To enable depth write with out depth test in gl you must enable depth test with depth func always. OpenGL Even if the ...
0
votes
0answers
102 views

Depth Test not working properly on Nvidia

So, I send a Development Test of my in-dev game to some friends, and they found out that the Depth Test in OpenGL does not work on Nvidia. I use my own matrices and sent them to the shader, and at ...
5
votes
1answer
411 views

Slow glReadPixels

I have implemented a lense flare for my game, and it looks great. The first draft used individual sprites each with its own draw call. This was very slow, so I reengineered it to use a single draw ...
2
votes
2answers
126 views

How scanline rendering finds an intersection with an object

I'm a newbie with graphics and after I read many articles on the web I still don't understand how in rasterizing from a pixel coordinate like (0;0) on the screen the intersection with an object (let's ...
0
votes
1answer
262 views

How to update “dynamicVertexBuffer” correctly with “setdata” on XNA?

I developed a small 3d games xna and uses a "DynamicVertexBuffer" and "DynamicIndexBuffer" to store and draw my vertices. Everything works fine, but my problem is the "Update" function where I update ...
2
votes
0answers
118 views

Best approach to depth streaming via existing codec [closed]

I'm working on a development system (and game) intended for games set mostly in static third-person views. We produce our scenery by CG and photographic techniques. Our background art is rendered ...
1
vote
2answers
441 views

How to clear a buffer to 1.0 instead of 0.0 in OpenGL?

Using glClear() you can set the buffer specified by the parameter to 0.0. This is useful say if you want pixels not covered by models to be black. Because vec3(0.0, 0.0, 0.0) results in black. But ...
4
votes
1answer
284 views

How do you display non-cutout transparent 2D textures with a depth buffer? (OpenGL)

I've been able to get my 2D renderer to display transparent cutout textures by testing the alpha of a fragment and discarding if it is less than 1 (or any fraction really). The problem is I want to ...
0
votes
1answer
409 views

Using depth buffer on a sprite

I am following this guide: http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:tiled_maps Trying to create a tiled map that also supports multiple layers. The guide says that a way is to use ...
1
vote
1answer
87 views

Drawing sprites messes up my model in XNA4

I have a model which draws correctly in XNA4. However if I try to add a background image (or any sprite), the rendering of my model is messed up. There are two problems with the rendering model is ...
0
votes
2answers
408 views

GLSL light coloring blocked surfaces

I have created a very simple lighting shader. It currently only supports point lights, but it lights up surfaces that are completely blocked from the light. I know why, but I want to know how I can ...
4
votes
1answer
125 views

Forcing early-z with raytracing

I'm working on a GLSL raytracer, and I need to be able to edit gl_FragDepth in the FS. However, doing so disables early-z culling. The scene is rendered front-to-back and the FS can only push points ...
3
votes
0answers
256 views

Annoying flickering of vertices and edges (possible z-fighting) [closed]

I'm trying to make a software z-buffer implementation (meaning no DirectX or OpenGL, only a 2D library, SDL to be precise), however, after I generate the z-buffer and proceed with the vertex culling, ...
-1
votes
1answer
421 views

Why distant objects are being drawn in front of close objects?

I am rendering two cubes in the space using XNA 4.0 and the layering of objects only works from certain angles. Here is what I see from the front angle (everything ok) Here is what I see from ...
3
votes
2answers
455 views

Scan-Line Z-Buffering Dilemma

I have a set of vertices in 3D space, and for each I retain the following information: Its 3D coordinates (x, y, z). A list of pointers to some of the other vertices with which it's connected by ...
8
votes
1answer
892 views

Depth interpolation for z-buffer, with scanline

I have to write my own software 3d rasterizer, and so far I am able to project my 3d model made of triangles into 2d space: I rotate, translate and project my points to get a 2d space representation ...
2
votes
0answers
191 views

Get Specific depth values in Kinect (XNA)

I'm currently trying to make a hand / finger tracking with a kinect in XNA. For this, I need to be able to specify the depth range I want my program to render. I've looked about, and I cannot see how ...
2
votes
1answer
1k views

Using SpriteBatch with BasicEffects and layerDepth creates negative Z values?

Simply: Why don't all of these sprites draw? What do I need to do to make them draw? I'm trying to use SpriteBatch.Draw with the layerDepth parameter to help reduce overdrawn. However I can't get it ...
3
votes
0answers
523 views

Copying render target texture loses all depth [duplicate]

I have a render target RenderTargetScene that holds my scene texture with the scene's depth buffer rtScene = new RenderTarget2D( graphicsDevice, ...
0
votes
2answers
116 views

Is it possible to read the frame to be output to the screen from GPU in XNA?

I want my XNA game to do its thing and at the end of the Draw() call read the the frame that is sent to the screen into memory (which in XNA would presumably be a Microsoft.Xna.Framework.Color[]). Is ...
0
votes
2answers
283 views

How to render depthmap image in 3d?

I'm new to game development and XNA. I have this depthmap image and I want to render it in 3D, how do I do it, any tutorial or blog post would be helpful.
2
votes
1answer
352 views

My transparent objects overwrite opaque objects depth and always draw on top?

I have set up an 'Order Independent Transparency' method for drawing my transparent objects. The algorithm can be simplified as follows: DrawOpaqueObjects() DrawTransparentObjects() Drawing the ...
0
votes
4answers
998 views

What is the format of DXGI_FORMAT_D24_UNORM_S8_UINT?

I'm trying to read the values in a depth texture of type DXGI_FORMAT_D24_UNORM_S8_UINT. I know this means "24 bits for depth, 8 bits for stencil" "A 32-bit z-buffer format that supports 24 bits for ...
2
votes
1answer
354 views

Position Reconstruction from Depth by inverting Perspective Projection

I had some trouble reconstructing position from depth sampled from the depth buffer. I use the equivalent of gluPerspective in GLM. The code in GLM is: template GLM_FUNC_QUALIFIER detail::tmat4x4 ...
3
votes
2answers
130 views

How can I simulate multiple depth channels?

Here's what I'd like to achieve: Rendering a first pass of objects in my scene, using standard depth comparison Rendering another pass of objects in the same scene, but with the following rules: A ...
9
votes
1answer
164 views

What would be a good filter to create 'magnetic deformers' from a depth map?

In my project, I am creating a system for deforming a highly detailed mesh (clothing) so that it 'fits' a convex mesh. To do this I use depth maps of the item and the 'hull' to determine at what point ...
4
votes
3answers
494 views

When does depth testing happen?

I'm working with 2D sprites - and I want to do 3D style depth testing with them. When writing a pixel shader for them, I get access to the semantic DEPTH0. Would writing to this value help? It seems ...
3
votes
1answer
1k views

What are the valid DepthBuffer Texture formats in DirectX 11? And which are also valid for a staging resource?

I am trying to read the contents of the depth buffer into main memory so that my CPU side code can do Some Stuff™ with it. I am attempting to do this by creating a staging resource which can be read ...
1
vote
1answer
1k views

Early Z culling - Ogre

For Ogre experienced people, but also experts in the field: Early Z culling is sometimes quite desirable, and that's what I tried to do in Ogre by using a two pass material. The first one is writing ...