void* CustomNonbondedForceProxy::deserialize(const SerializationNode& node) const {
if (node.getIntProperty("version") != 1)
throw OpenMMException("Unsupported version number");
CustomNonbondedForce* force = NULL;
try {
CustomNonbondedForce* force = new CustomNonbondedForce(node.getStringProperty("energy"));
force->setNonbondedMethod((CustomNonbondedForce::NonbondedMethod) node.getIntProperty("method"));
force->setCutoffDistance(node.getDoubleProperty("cutoff"));
const SerializationNode& perParticleParams = node.getChildNode("PerParticleParameters");
for (int i = 0; i < (int) perParticleParams.getChildren().size(); i++) {
const SerializationNode& parameter = perParticleParams.getChildren()[i];
force->addPerParticleParameter(parameter.getStringProperty("name"));
}
const SerializationNode& globalParams = node.getChildNode("GlobalParameters");
for (int i = 0; i < (int) globalParams.getChildren().size(); i++) {
const SerializationNode& parameter = globalParams.getChildren()[i];
force->addGlobalParameter(parameter.getStringProperty("name"), parameter.getDoubleProperty("default"));
}
const SerializationNode& particles = node.getChildNode("Particles");
vector<double> params(force->getNumPerParticleParameters());
for (int i = 0; i < (int) particles.getChildren().size(); i++) {
const SerializationNode& particle = particles.getChildren()[i];
for (int j = 0; j < (int) params.size(); j++) {
stringstream key;
key << "param";
key << j+1;
params[j] = particle.getDoubleProperty(key.str());
}
force->addParticle(params);
}
const SerializationNode& exclusions = node.getChildNode("Exclusions");
for (int i = 0; i < (int) exclusions.getChildren().size(); i++) {
const SerializationNode& exclusion = exclusions.getChildren()[i];
force->addExclusion(exclusion.getIntProperty("p1"), exclusion.getIntProperty("p2"));
}
const SerializationNode& functions = node.getChildNode("Functions");
for (int i = 0; i < (int) functions.getChildren().size(); i++) {
const SerializationNode& function = functions.getChildren()[i];
const SerializationNode& valuesNode = function.getChildNode("Values");
vector<double> values;
for (int j = 0; j < (int) valuesNode.getChildren().size(); j++)
values.push_back(valuesNode.getChildren()[j].getDoubleProperty("v"));
force->addFunction(function.getStringProperty("name"), values, function.getDoubleProperty("min"), function.getDoubleProperty("max"));
}
return force;
}
catch (...) {
if (force != NULL)
delete force;
throw;
}
}
void testTabulatedFunction() {
ReferencePlatform platform;
System system;
system.addParticle(1.0);
system.addParticle(1.0);
VerletIntegrator integrator(0.01);
CustomNonbondedForce* forceField = new CustomNonbondedForce("fn(r)+1");
forceField->addParticle(vector<double>());
forceField->addParticle(vector<double>());
vector<double> table;
for (int i = 0; i < 21; i++)
table.push_back(std::sin(0.25*i));
forceField->addFunction("fn", table, 1.0, 6.0);
system.addForce(forceField);
Context context(system, integrator, platform);
vector<Vec3> positions(2);
positions[0] = Vec3(0, 0, 0);
double tol = 0.01;
for (int i = 1; i < 30; i++) {
double x = (7.0/30.0)*i;
positions[1] = Vec3(x, 0, 0);
context.setPositions(positions);
State state = context.getState(State::Forces | State::Energy);
const vector<Vec3>& forces = state.getForces();
double force = (x < 1.0 || x > 6.0 ? 0.0 : -std::cos(x-1.0));
double energy = (x < 1.0 || x > 6.0 ? 0.0 : std::sin(x-1.0))+1.0;
ASSERT_EQUAL_VEC(Vec3(-force, 0, 0), forces[0], 0.1);
ASSERT_EQUAL_VEC(Vec3(force, 0, 0), forces[1], 0.1);
ASSERT_EQUAL_TOL(energy, state.getPotentialEnergy(), 0.02);
}
for (int i = 1; i < 20; i++) {
double x = 0.25*i+1.0;
positions[1] = Vec3(x, 0, 0);
context.setPositions(positions);
State state = context.getState(State::Energy);
double energy = (x < 1.0 || x > 6.0 ? 0.0 : std::sin(x-1.0))+1.0;
ASSERT_EQUAL_TOL(energy, state.getPotentialEnergy(), 1e-4);
}
}
