When defining a variable of type dim3, any component left. dim3 is an integer vector type based on uint3 that is used to specify dimensions. However, the access pattern depends on how you are interpreting your data and also how you are accessing them by 1D, 2D and 3D blocks of threads. See the programming guide, section 4.3.1.2. The memory is always a 1D continuous space of bytes. dimBlock () and dimGrid () are setting the initial values using constructors. To sumup, it does it matter if you use a dim3 structure. dim3 is just a structure designed for storing block and grid dimensions. Int y = blockIdx.y * blockDim.y + threadIdx.y īecause blockIdx.y and threadIdx.y will be zero. So, in both cases: dim3 blockDims(512) and myKernel>(.) you will always have access to threadIdx.y and threadIdx.z.Īs the thread ids start at zero, you can calculate a memory position as a row major order using also the ydimension: int x = blockIdx.x * blockDim.x + threadIdx.x The same happens for the blocks and the grid. ![]() When defining a variable of type dim3, any component left unspecified is initialized to 1. ![]() If your y-coordinate was 76 you would do: fslroi sub-004T1wwrapped sub-004T1wback 0 256 76 180 0 128 Now just type fslroi to see the usage. You're now ready to extract the back part of the head into a temporary file. However, the access pattern depends on how you are interpreting your data and also how you are accessing them by 1D, 2D and 3D blocks of threads.ĭim3 is an integer vector type based on uint3 that is used to specify dimensions. Now use fslinfo to find out what the image matrix dimensions are (dim1,dim2,dim3). The memory is always a 1D continuous space of bytes. fslinfo datatype FLOAT32 dim1 64 dim2 64 dim3 33 dim4 1 datatype 16 pixdim1 3.125000 pixdim2 3.125000 pixdim3 4.000000 pixdim4 2. The way you arrange the data in memory is independently on how you would configure the threads of your kernel. In freeviewer the files are shown in fslview no.
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