4b665fa82b
URDF import demo: add COLLADA .dae file support add FiniteElementMethod demo, extracted from the OpenTissue library (under the zlib license) don't crash if loading an invalid STL file add comparison with Assimp for COLLADA file loading (disabled by default, to avoid library dependency) Gwen: disable some flags that make the build incompatible
85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
#ifndef OPENTISSUE_DYNAMICS_FEM_FEM_INIT_H
|
|
#define OPENTISSUE_DYNAMICS_FEM_FEM_INIT_H
|
|
//
|
|
// OpenTissue Template Library
|
|
// - A generic toolbox for physics-based modeling and simulation.
|
|
// Copyright (C) 2008 Department of Computer Science, University of Copenhagen.
|
|
//
|
|
// OTTL is licensed under zlib: http://opensource.org/licenses/zlib-license.php
|
|
//
|
|
#include <OpenTissue/configuration.h>
|
|
|
|
#include <OpenTissue/dynamics/fem/fem_uniform_young.h>
|
|
#include <OpenTissue/dynamics/fem/fem_uniform_poisson.h>
|
|
#include <OpenTissue/dynamics/fem/fem_uniform_density.h>
|
|
#include <OpenTissue/dynamics/fem/fem_compute_mass.h>
|
|
#include <OpenTissue/dynamics/fem/fem_initialize_stiffness_elements.h>
|
|
#include <OpenTissue/dynamics/fem/fem_clear_stiffness_assembly.h>
|
|
#include <OpenTissue/dynamics/fem/fem_initialize_plastic.h>
|
|
|
|
namespace OpenTissue
|
|
{
|
|
namespace fem
|
|
{
|
|
/**
|
|
* Initialize Data Structres.
|
|
* Should be invoked at start-up before any calls to animate_warping.
|
|
*
|
|
* This function assumes that mesh geometry have been set up prior
|
|
* to invokation (i.e. both world coord and orignial coord are initlized
|
|
* and the same).
|
|
*
|
|
* This method initialized the model with the same material parameters. End
|
|
* user could write his or her own initilization method replacing
|
|
* the steps where young modules, poisson ratio and densities are
|
|
* assigned to the model.
|
|
*
|
|
* @param mesh
|
|
* @param young Young Moduls, a value of 500000 seems work quite well.
|
|
* @param poisson Poisson ration, a value of 0.33 seems work quite well.
|
|
* @param density Mass density, a value of 1000 seems to work quite well.
|
|
* @param c_yield Plastic yield.
|
|
* @param c_creep Plastic creep.
|
|
* @param c_max Plastic max.
|
|
*/
|
|
template < typename fem_mesh,typename real_type >
|
|
inline void init(
|
|
fem_mesh & mesh,
|
|
real_type const & young,
|
|
real_type const & poisson,
|
|
real_type const & density,
|
|
real_type const & c_yield,
|
|
real_type const & c_creep,
|
|
real_type const & c_max
|
|
)
|
|
{
|
|
assert(poisson>=0 || !"uniform_poisson() : Poisson ratio must be non-negative");
|
|
assert(poisson<=0.5 || !"uniform_poisson() : Poisson ratio must not be larger than a half");
|
|
assert(density>0 || !"uniform_density(): density must be positive");
|
|
|
|
//--- Assign material parameters
|
|
for (int t=0;t<mesh.m_tetrahedra.size();t++)
|
|
{
|
|
mesh.m_tetrahedra[t].m_young = young;
|
|
mesh.m_tetrahedra[t].m_poisson = poisson;
|
|
mesh.m_tetrahedra[t].m_density = density;
|
|
detail::initialize_stiffness_elements_single(&mesh.m_tetrahedra[t]);
|
|
}
|
|
//--- Compute stiffness and mass matrices
|
|
for (int m=0;m<mesh.m_nodes.size();m++)
|
|
{
|
|
detail::clear_stiffness_assembly_single(&mesh.m_nodes[m]);
|
|
}
|
|
detail::compute_mass(mesh);
|
|
for (int t=0;t<mesh.m_tetrahedra.size();t++)
|
|
{
|
|
detail::initialize_plastic_single(&mesh.m_tetrahedra[t],c_yield,c_creep,c_max);
|
|
}
|
|
}
|
|
|
|
} // namespace fem
|
|
} // namespace OpenTissue
|
|
|
|
//OPENTISSUE_DYNAMICS_FEM_FEM_INIT_H
|
|
#endif
|