Fix problem with Rigid bodies, contacts and TLMPM. Now rigid bodies n…

…eed to have their density specified.

src/material.cpp

@@ -291,7 +291,7 @@ void Material::add_material(vector<string> args) {
 			    cp, kappa});
 
   } else if (args[1].compare("rigid") == 0) {
-    materials.push_back(Mat{args[0], RIGID});
+    materials.push_back(Mat{args[0], RIGID, input->parsev(args[2])});
   } else {
     // create the Material
     int iEOS = material->find_EOS(args[2]);
@@ -656,7 +656,9 @@ void Material::read_restart(ifstream *ifr) {
 
       materials.push_back(Mat{id, type, rho0, E, nu, cp, kappa});
     } else if (type == RIGID) {
-      materials.push_back(Mat{id, RIGID});
+      double rho0;
+      ifr->read(reinterpret_cast<char *>(&rho0), sizeof(double));
+      materials.push_back(Mat{id, RIGID, rho0});
     } else {
       error->one(FLERR, "Error: unkown material type" + to_string(type) + ".\n");
     }
@@ -768,8 +770,9 @@ Mat::Mat(string id_, int type_, double rho0_, double E_, double nu_, double cp_,
 
 /*! The arguments are: material ID, material type (see Material::constitutive_model)
  */
-Mat::Mat(string id_, int type_) {
+Mat::Mat(string id_, int type_, double rho0_) {
   type = type_;
   id = id_;
   rigid = true;
+  rho0 = rho0_;
 }

src/material.h

@@ -64,7 +64,7 @@ class Mat {
   Mat(string, int, class EOS *, class Strength *, class Damage *,
       class Temperature *);                          ///< Creates an elasto-plastic material
   Mat(string, int, double, double, double, double, double); ///< Creates a linear or Neo-Hookean material
-  Mat(string, int);                                  ///< Creates a rigid material
+  Mat(string, int, double);                                 ///< Creates a rigid material
 };
 
 /*! Stores all the user defined Equations of State, elasto-plastic, damage, and temperature
@@ -124,11 +124,11 @@ class Material : protected Pointers {
   template <typename T> static Damage *damage_creator(MPM *,vector<string>);
   template <typename T> static Temperature *temperature_creator(MPM *,vector<string>);
 
-  const map<string, string> usage = {{"rigid",        "Usage: material(material-ID, \033[1;32mrigid\033[0m)\n"},
+  const map<string, string> usage = {{"rigid",        "Usage: material(material-ID, \033[1;32mrigid\033[0m, rho)\n"},
 				     {"linear",       "Usage: material(material-ID, \033[1;32mlinear\033[0m, rho, E, nu, optional: cp, optional: kappa, optional: damage-ID)\n"},
 				     {"neo-hookean",  "Usage: material(material-ID, \033[1;32mneo-hookean\033[0m, rho, E, nu, optional: cp, optional: kappa, optional: damage-ID)\n"},
 				     {"eos-strength", "Usage: material(material-ID, \033[1;32meos-strength\033[0m, eos-ID, strength-ID, optional: damage-ID, optional: temperature-ID)\n"}};
-  const map<string, int>    Nargs = {{"rigid",        2},
+  const map<string, int>    Nargs = {{"rigid",        3},
 				     {"linear",       5},
 				     {"neo-hookean",  5},
 				     {"eos-strength", 4}};

src/solid.cpp

@@ -2022,11 +2022,7 @@ void Solid::populate(vector<string> args)
   else
     vol_ = delta * delta * delta;
 
-  double mass_;
-  if (mat->rigid)
-    mass_ = 1;
-  else
-    mass_ = mat->rho0 * vol_;
+  double mass_ = mat->rho0 * vol_;
 
   np_per_cell = (int) input->parsev(args[3]);
   double xi = 0.5;