4D Volume Rendering - Nvidia

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Raycasting – Image Order• Single-pass raycasting– Compute ray intersection with volume bounding box,advance along camera direction and composite– Ray-boundbox calculation [Roettger 2003]– Pros - Simple– Cons - Full load on fragment shaderImage Plane3D Volume
CUDA RaycastingInitdim3 m_blockSize(8,16); // Initialize block sizem_gridSize = dim3(iDivUp(width, m_blockSize.x), iDivUp(height, m_blockSize.y));// SET VOLUMESIZE AND CHANNEL DESCcudaMalloc3DArray(&m_dVolumeArray, &channelDesc, volumeSize);// Copy data from host to cuda array in device (m_dVolumeArray)// SET COPYPARAMS FOR CUDAMEMCPYcudaMemcpy3D(&copyParams);Draw//Mapping buffer object (m_pbo) so that kernels can read /writeto buffer//via the device memory address(d_outputImage)cudaGLMapBufferObject((void**)&d_outputImage, m_pbo);cudaMemset(d_outputImage, 0, width*height*4);// call CUDA kernel, writing results to PBOd_render(d_outputImage, width,height, near, far);//done with kernel, unmap buffer objectcudaGLUnmapBufferObject(m_pbo);//BLIT to screen(0,0) (1,0) (2,0)(0,1) (1,1) (2,1)Block ofthreads
Page 1 and 2: 4D Volume RenderingShalini Venkatar
Page 3 and 4: Outline• Volume rendering techniq
Page 5: Transfer function lookupTexture 1//
Page 10 and 11: Multi-pass raycasting - OpenGLFBOFr
Page 12 and 13: Pass 2- Draw on-screen quadInvoke r
Page 14 and 15: 4D - Caching all time steps• When
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

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