4D Volume Rendering - Nvidia

More documents

Recommendations

Info

<strong>4D</strong> - Caching all time steps• When graphicsmemory can holdentire <strong>4D</strong> data• Pros– As fast as drawDiskpData[nTimesteps][0][1][2]– No data copy in RAM …Main MemoryglTexImage3DtexArray[nTimesteps]…[0][1][2]Graphics MemoryGPU Draw Draw DrawBusDownloadDownloadDownloadtime
Caching - implementationInit – allocate all textures and download dataglActiveTextureARB(GL_TEXTURE0_ARB);Gluint* texArray = new GLuint[nTimesteps];glGenTextures(nTimesteps,texArray);//TODO - read from file to pDatafor (int i=0;i < nTimesteps;i++) {//iterate over all textures and donwloadglBindTexture(GL_TEXTURE_3D, texArray [i]);//TODO – Set Texture Params like wrap, filter using glTexParameteri//Download data to graphicsglTexImage3D(GL_TEXTURE_3D,0,GL_INTENSITY,dimx,dimy,dimz,0,GL_LUMINANCE,GL_UNSIGNED_BYTE,pData[i]);}//TODO – Optional: delete pData from main memorycurTimeStep = 0; //initialize current time stepDraw – switch to right timestepcurTimeStep ++;curTimeStep %= nTimesteps;glActiveTextureARB(GL_TEXTURE0_ARB);glBindTexture(GL_TEXTURE_3D, texArray[curTimeStep]);//CALL DRAWING CODE HEREGPU Draw Draw DrawBusDownloadInitDownloadDownloadDrawtime
Page 1 and 2: 4D Volume RenderingShalini Venkatar
Page 3 and 4: Outline• Volume rendering techniq
Page 5 and 6: Transfer function lookupTexture 1//
Page 7: CUDA RaycastingInitdim3 m_blockSize
Page 10 and 11: Multi-pass raycasting - OpenGLFBOFr
Page 12 and 13: Pass 2- Draw on-screen quadInvoke r
Page 16 and 17: Texture Streaming• When graphics
Page 18 and 19: CPU Asynchronous streaming• Non C
Page 20 and 21: PBO Implementation- DrawDraw - app-
Page 22 and 23: GPU Async - ImplementationMain draw
Page 24 and 25: Multi-GPU Distributed RenderingSort
Page 26 and 27: Stereo in Volume Rendering• Provi
Page 28: Demo and Q&Ashaliniv@nvidia.comSeis

4D Volume Rendering - Nvidia

Create successful ePaper yourself

Delete template?

Save as template?