11 Replies Latest reply on Aug 20, 2013 3:15 AM by kgussan

    OpenGL4.3 Driver : voxel cone tracing is too slow

    kgussan

      Hello All,

       

      I am wondering why voxel cone tracing demo is too slow on HD7900 with AMD's openGL 4.3 driver.


      I have tried following voxel cone tracing demo.

      Voxel Cone Tracing Global Illumination in OpenGL 4.3 - 3D Tech News and Pixel Hacking - Geeks3D.com

      Running speed is less than 1fps. I feel this is too slow comparing with nVIDIA GPU.

      How can I get more FPS?

      256x256x256.png

      (supplement)

      1) When I change voxel size from 256x256x256 to 16x16x16, fps incresed to 2.

      2) According to geeks3D.com, even nvidia old card is faster.

      - GTX560:11fps

        - GTX 680: 30fps

      3) My environment is

      - HD7900 with 3GB video memory / PCIexpress 2.0x16

      - windows 7 64bit

      - core i7 980@3.3GHz

      - system memory 24GB

      - I have installed following driver. I have tried beta1 and beta2, both result is the same.

      AMD Catalyst™ OpenGL 4.3 Beta Driver

       

      Thank you in advance.