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POWhy depth test does not work in offscreen rendering for color pick?
 

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    <p>I'm using coloring and off-screen rendering to implement a selection tool for QUADS on OpenGL. But the depth test seems to not work in the off-screen rendering and in certain angles and rotations, the QUAD behind the front one is selected. Any thoughts on how I should set up my Buffers and/or attachments? Does this problem have anything to do with my normals??? Or is just depth test?? I personally think it's depth test, I just can't get the damn thing working!!!</p> <p>Here is My init function for buffers:</p> <pre><code>public void init(final GL2 gl) { // setup gl.glGenFramebuffers(frameBufferIds.capacity(), frameBufferIds); gl.glGenRenderbuffers(renderBufferIds.capacity(), renderBufferIds); gl.glBindRenderbuffer(GL2.GL_RENDERBUFFER, renderBufferIds.get(0)); // ViewPort viewPort = ViewPort.getCurrent(gl); gl.glRenderbufferStorage(GL2.GL_RENDERBUFFER, GL2.GL_RGBA, viewPort.getWidth(), viewPort.getHeight()); /** * Comment 1 */ // gl.glRenderbufferStorage(GL2.GL_RENDERBUFFER, GL2.GL_DEPTH_COMPONENT, viewPort.getWidth(), viewPort.getHeight()); // attach the render buffer to color attachment point gl.glBindFramebuffer(GL2.GL_FRAMEBUFFER, frameBufferIds.get(0)); gl.glFramebufferRenderbuffer(GL2.GL_FRAMEBUFFER, GL2.GL_COLOR_ATTACHMENT0, GL2.GL_RENDERBUFFER, renderBufferIds.get(0)); /** * Comment 2 */ // gl.glFramebufferRenderbuffer(GL2.GL_FRAMEBUFFER, GL2.GL_DEPTH_ATTACHMENT, GL2.GL_RENDERBUFFER, renderBufferIds.get(0)); // if (gl.glCheckFramebufferStatus(GL.GL_FRAMEBUFFER) != GL2.GL_FRAMEBUFFER_COMPLETE) { System.out.println("Render Buffer problem!"); } } </code></pre> <p>When I uncomment the "Comment 1" and "Comment 2" parts, I get a render buffer problem. But I've heard that I should attach "a render buffer to the GL_DEPTH_ATTACHMENT in addition to the color attachment." (Source: <a href="https://stackoverflow.com/questions/5751081/how-to-use-depth-testing-when-rendering-to-an-offscreen-buffer-then-onto-texture">Look at this Q</a>. I wonder How can I do that.</p> <p>Also, here is my usage code:</p> <pre><code>gl.glDisable(GL2.GL_DITHER); // 1. render in offscreen init(gl); gl.glEnable(GL2.GL_DEPTH_TEST); offscreenRender(gl, selectionType); // 2. read pixel gl.glReadBuffer(GL2.GL_DEPTH_ATTACHMENT); gl.glReadBuffer(GL2.GL_COLOR_ATTACHMENT0); gl.glReadPixels((int) (pos.x - pickWidth / 2), (int) (viewPort.getHeight() - pos.y - pickWidth / 2), pickWidth, pickWidth, GL2.GL_RGBA, GL2.GL_FLOAT, pointSelectionPixels); </code></pre>
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