In OpenGL, I'm trying to render a depth map that doesn't loose precision with fa away objects. Do you know of any way I can accomplish this task?

My approach so far: I tried the "reverse depth" trick (here for example).

• I modified the perspective projection matrix in such a way that the near and far values are mapped as [-n, -f] -> [1, 0] instead of the usual [-n, -f] -> [-1, 1]
• I rendered the depth map to a framebuffer, using in particular the 32F depth component glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, conf::SCR_WIDTH, conf::SCR_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL)
• plus I tackled the need for clipping to [1,0] using glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE) (documentation here)
• lastly, after rendering the depth map to the framebuffer, I take the depth values and map them back to eye coordinates, divide by the far plane value, and use this value as a color

However I couldn't notice any gain in precision. Am I doing anything wrong? Is there any better approach?

---

Example on a close by cube: you can really see the discrete transitions, I would like a smoother output