523 lines
14 KiB
C++
523 lines
14 KiB
C++
#include "btMiniSDF.h"
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//
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//Based on code from DiscreGrid, https://github.com/InteractiveComputerGraphics/Discregrid
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//example:
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//GenerateSDF.exe -r "32 32 32" -d "-1.6 -1.6 -.6 1.6 1.6 .6" concave_box.obj
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//The MIT License (MIT)
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//
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//Copyright (c) 2017 Dan Koschier
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//
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#include <limits.h>
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#include <string.h> //memcpy
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struct btSdfDataStream
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{
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const char* m_data;
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int m_size;
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int m_currentOffset;
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btSdfDataStream(const char* data, int size)
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: m_data(data),
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m_size(size),
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m_currentOffset(0)
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{
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}
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template <class T>
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bool read(T& val)
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{
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int bytes = sizeof(T);
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if (m_currentOffset + bytes <= m_size)
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{
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char* dest = (char*)&val;
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memcpy(dest, &m_data[m_currentOffset], bytes);
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m_currentOffset += bytes;
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return true;
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}
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btAssert(0);
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return false;
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}
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};
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bool btMiniSDF::load(const char* data, int size)
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{
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int fileSize = -1;
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btSdfDataStream ds(data, size);
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{
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double buf[6];
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ds.read(buf);
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m_domain.m_min[0] = buf[0];
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m_domain.m_min[1] = buf[1];
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m_domain.m_min[2] = buf[2];
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m_domain.m_min[3] = 0;
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m_domain.m_max[0] = buf[3];
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m_domain.m_max[1] = buf[4];
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m_domain.m_max[2] = buf[5];
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m_domain.m_max[3] = 0;
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}
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{
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unsigned int buf2[3];
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ds.read(buf2);
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m_resolution[0] = buf2[0];
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m_resolution[1] = buf2[1];
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m_resolution[2] = buf2[2];
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}
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{
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double buf[3];
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ds.read(buf);
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m_cell_size[0] = buf[0];
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m_cell_size[1] = buf[1];
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m_cell_size[2] = buf[2];
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}
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{
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double buf[3];
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ds.read(buf);
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m_inv_cell_size[0] = buf[0];
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m_inv_cell_size[1] = buf[1];
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m_inv_cell_size[2] = buf[2];
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}
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{
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unsigned long long int cells;
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ds.read(cells);
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m_n_cells = cells;
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}
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{
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unsigned long long int fields;
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ds.read(fields);
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m_n_fields = fields;
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}
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unsigned long long int nodes0;
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std::size_t n_nodes0;
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ds.read(nodes0);
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n_nodes0 = nodes0;
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if (n_nodes0 > 1024 * 1024 * 1024)
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{
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return m_isValid;
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}
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m_nodes.resize(n_nodes0);
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for (unsigned int i = 0; i < n_nodes0; i++)
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{
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unsigned long long int n_nodes1;
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ds.read(n_nodes1);
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btAlignedObjectArray<double>& nodes = m_nodes[i];
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nodes.resize(n_nodes1);
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for (int j = 0; j < nodes.size(); j++)
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{
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double& node = nodes[j];
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ds.read(node);
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}
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}
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unsigned long long int n_cells0;
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ds.read(n_cells0);
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m_cells.resize(n_cells0);
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for (int i = 0; i < n_cells0; i++)
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{
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unsigned long long int n_cells1;
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btAlignedObjectArray<btCell32>& cells = m_cells[i];
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ds.read(n_cells1);
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cells.resize(n_cells1);
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for (int j = 0; j < n_cells1; j++)
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{
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btCell32& cell = cells[j];
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ds.read(cell);
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}
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}
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{
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unsigned long long int n_cell_maps0;
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ds.read(n_cell_maps0);
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m_cell_map.resize(n_cell_maps0);
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for (int i = 0; i < n_cell_maps0; i++)
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{
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unsigned long long int n_cell_maps1;
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btAlignedObjectArray<unsigned int>& cell_maps = m_cell_map[i];
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ds.read(n_cell_maps1);
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cell_maps.resize(n_cell_maps1);
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for (int j = 0; j < n_cell_maps1; j++)
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{
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unsigned int& cell_map = cell_maps[j];
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ds.read(cell_map);
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}
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}
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}
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m_isValid = (ds.m_currentOffset == ds.m_size);
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return m_isValid;
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}
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unsigned int btMiniSDF::multiToSingleIndex(btMultiIndex const& ijk) const
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{
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return m_resolution[1] * m_resolution[0] * ijk.ijk[2] + m_resolution[0] * ijk.ijk[1] + ijk.ijk[0];
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}
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btAlignedBox3d
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btMiniSDF::subdomain(btMultiIndex const& ijk) const
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{
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btAssert(m_isValid);
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btVector3 tmp;
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tmp.m_floats[0] = m_cell_size[0] * (double)ijk.ijk[0];
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tmp.m_floats[1] = m_cell_size[1] * (double)ijk.ijk[1];
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tmp.m_floats[2] = m_cell_size[2] * (double)ijk.ijk[2];
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btVector3 origin = m_domain.min() + tmp;
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btAlignedBox3d box = btAlignedBox3d(origin, origin + m_cell_size);
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return box;
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}
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btMultiIndex
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btMiniSDF::singleToMultiIndex(unsigned int l) const
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{
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btAssert(m_isValid);
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unsigned int n01 = m_resolution[0] * m_resolution[1];
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unsigned int k = l / n01;
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unsigned int temp = l % n01;
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unsigned int j = temp / m_resolution[0];
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unsigned int i = temp % m_resolution[0];
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btMultiIndex mi;
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mi.ijk[0] = i;
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mi.ijk[1] = j;
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mi.ijk[2] = k;
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return mi;
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}
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btAlignedBox3d
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btMiniSDF::subdomain(unsigned int l) const
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{
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btAssert(m_isValid);
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return subdomain(singleToMultiIndex(l));
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}
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btShapeMatrix
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btMiniSDF::shape_function_(btVector3 const& xi, btShapeGradients* gradient) const
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{
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btAssert(m_isValid);
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btShapeMatrix res;
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btScalar x = xi[0];
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btScalar y = xi[1];
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btScalar z = xi[2];
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btScalar x2 = x * x;
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btScalar y2 = y * y;
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btScalar z2 = z * z;
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btScalar _1mx = 1.0 - x;
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btScalar _1my = 1.0 - y;
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btScalar _1mz = 1.0 - z;
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btScalar _1px = 1.0 + x;
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btScalar _1py = 1.0 + y;
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btScalar _1pz = 1.0 + z;
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btScalar _1m3x = 1.0 - 3.0 * x;
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btScalar _1m3y = 1.0 - 3.0 * y;
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btScalar _1m3z = 1.0 - 3.0 * z;
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btScalar _1p3x = 1.0 + 3.0 * x;
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btScalar _1p3y = 1.0 + 3.0 * y;
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btScalar _1p3z = 1.0 + 3.0 * z;
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btScalar _1mxt1my = _1mx * _1my;
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btScalar _1mxt1py = _1mx * _1py;
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btScalar _1pxt1my = _1px * _1my;
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btScalar _1pxt1py = _1px * _1py;
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btScalar _1mxt1mz = _1mx * _1mz;
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btScalar _1mxt1pz = _1mx * _1pz;
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btScalar _1pxt1mz = _1px * _1mz;
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btScalar _1pxt1pz = _1px * _1pz;
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btScalar _1myt1mz = _1my * _1mz;
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btScalar _1myt1pz = _1my * _1pz;
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btScalar _1pyt1mz = _1py * _1mz;
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btScalar _1pyt1pz = _1py * _1pz;
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btScalar _1mx2 = 1.0 - x2;
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btScalar _1my2 = 1.0 - y2;
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btScalar _1mz2 = 1.0 - z2;
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// Corner nodes.
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btScalar fac = 1.0 / 64.0 * (9.0 * (x2 + y2 + z2) - 19.0);
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res[0] = fac * _1mxt1my * _1mz;
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res[1] = fac * _1pxt1my * _1mz;
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res[2] = fac * _1mxt1py * _1mz;
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res[3] = fac * _1pxt1py * _1mz;
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res[4] = fac * _1mxt1my * _1pz;
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res[5] = fac * _1pxt1my * _1pz;
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res[6] = fac * _1mxt1py * _1pz;
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res[7] = fac * _1pxt1py * _1pz;
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// Edge nodes.
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fac = 9.0 / 64.0 * _1mx2;
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btScalar fact1m3x = fac * _1m3x;
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btScalar fact1p3x = fac * _1p3x;
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res[8] = fact1m3x * _1myt1mz;
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res[9] = fact1p3x * _1myt1mz;
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res[10] = fact1m3x * _1myt1pz;
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res[11] = fact1p3x * _1myt1pz;
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res[12] = fact1m3x * _1pyt1mz;
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res[13] = fact1p3x * _1pyt1mz;
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res[14] = fact1m3x * _1pyt1pz;
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res[15] = fact1p3x * _1pyt1pz;
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fac = 9.0 / 64.0 * _1my2;
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btScalar fact1m3y = fac * _1m3y;
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btScalar fact1p3y = fac * _1p3y;
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res[16] = fact1m3y * _1mxt1mz;
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res[17] = fact1p3y * _1mxt1mz;
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res[18] = fact1m3y * _1pxt1mz;
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res[19] = fact1p3y * _1pxt1mz;
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res[20] = fact1m3y * _1mxt1pz;
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res[21] = fact1p3y * _1mxt1pz;
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res[22] = fact1m3y * _1pxt1pz;
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res[23] = fact1p3y * _1pxt1pz;
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fac = 9.0 / 64.0 * _1mz2;
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btScalar fact1m3z = fac * _1m3z;
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btScalar fact1p3z = fac * _1p3z;
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res[24] = fact1m3z * _1mxt1my;
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res[25] = fact1p3z * _1mxt1my;
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res[26] = fact1m3z * _1mxt1py;
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res[27] = fact1p3z * _1mxt1py;
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res[28] = fact1m3z * _1pxt1my;
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res[29] = fact1p3z * _1pxt1my;
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res[30] = fact1m3z * _1pxt1py;
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res[31] = fact1p3z * _1pxt1py;
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if (gradient)
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{
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btShapeGradients& dN = *gradient;
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btScalar _9t3x2py2pz2m19 = 9.0 * (3.0 * x2 + y2 + z2) - 19.0;
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btScalar _9tx2p3y2pz2m19 = 9.0 * (x2 + 3.0 * y2 + z2) - 19.0;
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btScalar _9tx2py2p3z2m19 = 9.0 * (x2 + y2 + 3.0 * z2) - 19.0;
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btScalar _18x = 18.0 * x;
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btScalar _18y = 18.0 * y;
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btScalar _18z = 18.0 * z;
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btScalar _3m9x2 = 3.0 - 9.0 * x2;
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btScalar _3m9y2 = 3.0 - 9.0 * y2;
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btScalar _3m9z2 = 3.0 - 9.0 * z2;
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btScalar _2x = 2.0 * x;
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btScalar _2y = 2.0 * y;
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btScalar _2z = 2.0 * z;
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btScalar _18xm9t3x2py2pz2m19 = _18x - _9t3x2py2pz2m19;
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btScalar _18xp9t3x2py2pz2m19 = _18x + _9t3x2py2pz2m19;
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btScalar _18ym9tx2p3y2pz2m19 = _18y - _9tx2p3y2pz2m19;
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btScalar _18yp9tx2p3y2pz2m19 = _18y + _9tx2p3y2pz2m19;
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btScalar _18zm9tx2py2p3z2m19 = _18z - _9tx2py2p3z2m19;
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btScalar _18zp9tx2py2p3z2m19 = _18z + _9tx2py2p3z2m19;
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dN(0, 0) = _18xm9t3x2py2pz2m19 * _1myt1mz;
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dN(0, 1) = _1mxt1mz * _18ym9tx2p3y2pz2m19;
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dN(0, 2) = _1mxt1my * _18zm9tx2py2p3z2m19;
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dN(1, 0) = _18xp9t3x2py2pz2m19 * _1myt1mz;
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dN(1, 1) = _1pxt1mz * _18ym9tx2p3y2pz2m19;
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dN(1, 2) = _1pxt1my * _18zm9tx2py2p3z2m19;
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dN(2, 0) = _18xm9t3x2py2pz2m19 * _1pyt1mz;
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dN(2, 1) = _1mxt1mz * _18yp9tx2p3y2pz2m19;
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dN(2, 2) = _1mxt1py * _18zm9tx2py2p3z2m19;
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dN(3, 0) = _18xp9t3x2py2pz2m19 * _1pyt1mz;
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dN(3, 1) = _1pxt1mz * _18yp9tx2p3y2pz2m19;
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dN(3, 2) = _1pxt1py * _18zm9tx2py2p3z2m19;
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dN(4, 0) = _18xm9t3x2py2pz2m19 * _1myt1pz;
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dN(4, 1) = _1mxt1pz * _18ym9tx2p3y2pz2m19;
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dN(4, 2) = _1mxt1my * _18zp9tx2py2p3z2m19;
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dN(5, 0) = _18xp9t3x2py2pz2m19 * _1myt1pz;
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dN(5, 1) = _1pxt1pz * _18ym9tx2p3y2pz2m19;
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dN(5, 2) = _1pxt1my * _18zp9tx2py2p3z2m19;
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dN(6, 0) = _18xm9t3x2py2pz2m19 * _1pyt1pz;
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dN(6, 1) = _1mxt1pz * _18yp9tx2p3y2pz2m19;
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dN(6, 2) = _1mxt1py * _18zp9tx2py2p3z2m19;
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dN(7, 0) = _18xp9t3x2py2pz2m19 * _1pyt1pz;
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dN(7, 1) = _1pxt1pz * _18yp9tx2p3y2pz2m19;
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dN(7, 2) = _1pxt1py * _18zp9tx2py2p3z2m19;
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dN.topRowsDivide(8, 64.0);
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btScalar _m3m9x2m2x = -_3m9x2 - _2x;
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btScalar _p3m9x2m2x = _3m9x2 - _2x;
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btScalar _1mx2t1m3x = _1mx2 * _1m3x;
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btScalar _1mx2t1p3x = _1mx2 * _1p3x;
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dN(8, 0) = _m3m9x2m2x * _1myt1mz,
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dN(8, 1) = -_1mx2t1m3x * _1mz,
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dN(8, 2) = -_1mx2t1m3x * _1my;
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dN(9, 0) = _p3m9x2m2x * _1myt1mz,
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dN(9, 1) = -_1mx2t1p3x * _1mz,
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dN(9, 2) = -_1mx2t1p3x * _1my;
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dN(10, 0) = _m3m9x2m2x * _1myt1pz,
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dN(10, 1) = -_1mx2t1m3x * _1pz,
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dN(10, 2) = _1mx2t1m3x * _1my;
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dN(11, 0) = _p3m9x2m2x * _1myt1pz,
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dN(11, 1) = -_1mx2t1p3x * _1pz,
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dN(11, 2) = _1mx2t1p3x * _1my;
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dN(12, 0) = _m3m9x2m2x * _1pyt1mz,
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dN(12, 1) = _1mx2t1m3x * _1mz,
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dN(12, 2) = -_1mx2t1m3x * _1py;
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dN(13, 0) = _p3m9x2m2x * _1pyt1mz,
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dN(13, 1) = _1mx2t1p3x * _1mz,
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dN(13, 2) = -_1mx2t1p3x * _1py;
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dN(14, 0) = _m3m9x2m2x * _1pyt1pz,
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dN(14, 1) = _1mx2t1m3x * _1pz,
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dN(14, 2) = _1mx2t1m3x * _1py;
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dN(15, 0) = _p3m9x2m2x * _1pyt1pz,
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dN(15, 1) = _1mx2t1p3x * _1pz,
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dN(15, 2) = _1mx2t1p3x * _1py;
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btScalar _m3m9y2m2y = -_3m9y2 - _2y;
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btScalar _p3m9y2m2y = _3m9y2 - _2y;
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btScalar _1my2t1m3y = _1my2 * _1m3y;
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btScalar _1my2t1p3y = _1my2 * _1p3y;
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dN(16, 0) = -_1my2t1m3y * _1mz,
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dN(16, 1) = _m3m9y2m2y * _1mxt1mz,
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dN(16, 2) = -_1my2t1m3y * _1mx;
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dN(17, 0) = -_1my2t1p3y * _1mz,
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dN(17, 1) = _p3m9y2m2y * _1mxt1mz,
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dN(17, 2) = -_1my2t1p3y * _1mx;
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dN(18, 0) = _1my2t1m3y * _1mz,
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dN(18, 1) = _m3m9y2m2y * _1pxt1mz,
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dN(18, 2) = -_1my2t1m3y * _1px;
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dN(19, 0) = _1my2t1p3y * _1mz,
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dN(19, 1) = _p3m9y2m2y * _1pxt1mz,
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dN(19, 2) = -_1my2t1p3y * _1px;
|
|
dN(20, 0) = -_1my2t1m3y * _1pz,
|
|
dN(20, 1) = _m3m9y2m2y * _1mxt1pz,
|
|
dN(20, 2) = _1my2t1m3y * _1mx;
|
|
dN(21, 0) = -_1my2t1p3y * _1pz,
|
|
dN(21, 1) = _p3m9y2m2y * _1mxt1pz,
|
|
dN(21, 2) = _1my2t1p3y * _1mx;
|
|
dN(22, 0) = _1my2t1m3y * _1pz,
|
|
dN(22, 1) = _m3m9y2m2y * _1pxt1pz,
|
|
dN(22, 2) = _1my2t1m3y * _1px;
|
|
dN(23, 0) = _1my2t1p3y * _1pz,
|
|
dN(23, 1) = _p3m9y2m2y * _1pxt1pz,
|
|
dN(23, 2) = _1my2t1p3y * _1px;
|
|
|
|
btScalar _m3m9z2m2z = -_3m9z2 - _2z;
|
|
btScalar _p3m9z2m2z = _3m9z2 - _2z;
|
|
btScalar _1mz2t1m3z = _1mz2 * _1m3z;
|
|
btScalar _1mz2t1p3z = _1mz2 * _1p3z;
|
|
dN(24, 0) = -_1mz2t1m3z * _1my,
|
|
dN(24, 1) = -_1mz2t1m3z * _1mx,
|
|
dN(24, 2) = _m3m9z2m2z * _1mxt1my;
|
|
dN(25, 0) = -_1mz2t1p3z * _1my,
|
|
dN(25, 1) = -_1mz2t1p3z * _1mx,
|
|
dN(25, 2) = _p3m9z2m2z * _1mxt1my;
|
|
dN(26, 0) = -_1mz2t1m3z * _1py,
|
|
dN(26, 1) = _1mz2t1m3z * _1mx,
|
|
dN(26, 2) = _m3m9z2m2z * _1mxt1py;
|
|
dN(27, 0) = -_1mz2t1p3z * _1py,
|
|
dN(27, 1) = _1mz2t1p3z * _1mx,
|
|
dN(27, 2) = _p3m9z2m2z * _1mxt1py;
|
|
dN(28, 0) = _1mz2t1m3z * _1my,
|
|
dN(28, 1) = -_1mz2t1m3z * _1px,
|
|
dN(28, 2) = _m3m9z2m2z * _1pxt1my;
|
|
dN(29, 0) = _1mz2t1p3z * _1my,
|
|
dN(29, 1) = -_1mz2t1p3z * _1px,
|
|
dN(29, 2) = _p3m9z2m2z * _1pxt1my;
|
|
dN(30, 0) = _1mz2t1m3z * _1py,
|
|
dN(30, 1) = _1mz2t1m3z * _1px,
|
|
dN(30, 2) = _m3m9z2m2z * _1pxt1py;
|
|
dN(31, 0) = _1mz2t1p3z * _1py,
|
|
dN(31, 1) = _1mz2t1p3z * _1px,
|
|
dN(31, 2) = _p3m9z2m2z * _1pxt1py;
|
|
|
|
dN.bottomRowsMul(32u - 8u, 9.0 / 64.0);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool btMiniSDF::interpolate(unsigned int field_id, double& dist, btVector3 const& x,
|
|
btVector3* gradient) const
|
|
{
|
|
btAssert(m_isValid);
|
|
if (!m_isValid)
|
|
return false;
|
|
|
|
if (!m_domain.contains(x))
|
|
return false;
|
|
|
|
btVector3 tmpmi = ((x - m_domain.min()) * (m_inv_cell_size)); //.cast<unsigned int>().eval();
|
|
unsigned int mi[3] = {(unsigned int)tmpmi[0], (unsigned int)tmpmi[1], (unsigned int)tmpmi[2]};
|
|
if (mi[0] >= m_resolution[0])
|
|
mi[0] = m_resolution[0] - 1;
|
|
if (mi[1] >= m_resolution[1])
|
|
mi[1] = m_resolution[1] - 1;
|
|
if (mi[2] >= m_resolution[2])
|
|
mi[2] = m_resolution[2] - 1;
|
|
btMultiIndex mui;
|
|
mui.ijk[0] = mi[0];
|
|
mui.ijk[1] = mi[1];
|
|
mui.ijk[2] = mi[2];
|
|
int i = multiToSingleIndex(mui);
|
|
unsigned int i_ = m_cell_map[field_id][i];
|
|
if (i_ == UINT_MAX)
|
|
return false;
|
|
|
|
btAlignedBox3d sd = subdomain(i);
|
|
i = i_;
|
|
btVector3 d = sd.m_max - sd.m_min; //.diagonal().eval();
|
|
|
|
btVector3 denom = (sd.max() - sd.min());
|
|
btVector3 c0 = btVector3(2.0, 2.0, 2.0) / denom;
|
|
btVector3 c1 = (sd.max() + sd.min()) / denom;
|
|
btVector3 xi = (c0 * x - c1);
|
|
|
|
btCell32 const& cell = m_cells[field_id][i];
|
|
if (!gradient)
|
|
{
|
|
//auto phi = m_coefficients[field_id][i].dot(shape_function_(xi, 0));
|
|
double phi = 0.0;
|
|
btShapeMatrix N = shape_function_(xi, 0);
|
|
for (unsigned int j = 0u; j < 32u; ++j)
|
|
{
|
|
unsigned int v = cell.m_cells[j];
|
|
double c = m_nodes[field_id][v];
|
|
if (c == DBL_MAX)
|
|
{
|
|
return false;
|
|
;
|
|
}
|
|
phi += c * N[j];
|
|
}
|
|
|
|
dist = phi;
|
|
return true;
|
|
}
|
|
|
|
btShapeGradients dN;
|
|
btShapeMatrix N = shape_function_(xi, &dN);
|
|
|
|
double phi = 0.0;
|
|
gradient->setZero();
|
|
for (unsigned int j = 0u; j < 32u; ++j)
|
|
{
|
|
unsigned int v = cell.m_cells[j];
|
|
double c = m_nodes[field_id][v];
|
|
if (c == DBL_MAX)
|
|
{
|
|
gradient->setZero();
|
|
return false;
|
|
}
|
|
phi += c * N[j];
|
|
(*gradient)[0] += c * dN(j, 0);
|
|
(*gradient)[1] += c * dN(j, 1);
|
|
(*gradient)[2] += c * dN(j, 2);
|
|
}
|
|
(*gradient) *= c0;
|
|
dist = phi;
|
|
return true;
|
|
}
|