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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Errors with d3plot sph_* and part_* outputs.","articleBody":"**🐛 Describe the bug**\nMultiple issues with d3plot\n1. SPH data being read incorrectly.\n2. NRBs are read as parts\n\n**🔢 To Reproduce**\n1.\n1.1. Read d3plot (d3plot = D3plot(filepath))\n1.2. Read sph data: arr = d3plot.arrays['sph_mass']\narr.shape will be (N, ) with N being the number of states.\nThe same holds for many other SPH outputs (sph_n_neighbors, sph_density, ...)\nsph_n_neighbors actually returns the density of individual particles. sph_density and sph_mass return some incorrect arrays (sometimes with negative values)\n\n2.\n2.1. Read d3plot (d3plot = D3plot(filepath))\n2.2. parts = d3plot.arrays['part_ids'] \nparts will include ids of *CONSTRAINED_NODAL_RIGID_BODY\nThe same happens with part_kinetic_energy, where kinetic energy of NRBs is included.\n\n**💘 Expected behavior**\n1.\nFor sph data, return the overall correct sph_mass, density etc.. or\nreturn an array (N, X) where N is the number of states and X is the number of particles \n2.\nFor parts, exclude nrbs from part_* outputs.\n\n**🖥️ Setup**\n - lasso-python version: [2.0.3]\n - OS: [Windows 11]\n - LS-Dyna R14.0.0\n\n\n","author":{"url":"https://github.com/marcodesiderio","@type":"Person","name":"marcodesiderio"},"datePublished":"2025-03-06T16:57:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/67/lasso-python/issues/67"}