//// Field.cpp// interface//// Created by Philip Rosedale on 8/23/12.// Copyright (c) 2012 High Fidelity, Inc. All rights reserved.//// A vector-valued field over an array of elements arranged as a 3D lattice #include "Field.h" int Field::value(float *value, float *pos) { int index = (int)(pos[0] / _worldSize * 10.0) + (int)(pos[1] / _worldSize * 10.0) * 10 + (int)(pos[2] / _worldSize * 10.0) * 100; if ((index >= 0) && (index < FIELD_ELEMENTS)) { value[0] = _field[index].val.x; value[1] = _field[index].val.y; value[2] = _field[index].val.z; return 1; } else { return 0; }} Field::Field(float worldSize, float coupling) { _worldSize = worldSize; _coupling = coupling; //float fx, fy, fz; for (int i = 0; i < FIELD_ELEMENTS; i++) { const float FIELD_INITIAL_MAG = 0.0f; _field[i].val = randVector() * FIELD_INITIAL_MAG * _worldSize; _field[i].center.x = ((float)(i % 10) + 0.5f); _field[i].center.y = ((float)(i % 100 / 10) + 0.5f); _field[i].center.z = ((float)(i / 100) + 0.5f); _field[i].center *= _worldSize / 10.f; }} void Field::add(float* add, float *pos) { int index = (int)(pos[0] / _worldSize * 10.0) + (int)(pos[1] / _worldSize * 10.0) * 10 + (int)(pos[2] / _worldSize * 10.0) * 100; if ((index >= 0) && (index < FIELD_ELEMENTS)) { _field[index].val.x += add[0]; _field[index].val.y += add[1]; _field[index].val.z += add[2]; }} void Field::interact(float deltaTime, const glm::vec3& pos, glm::vec3& vel) { int index = (int)(pos.x / _worldSize * 10.0) + (int)(pos.y / _worldSize*10.0) * 10 + (int)(pos.z / _worldSize*10.0) * 100; if ((index >= 0) && (index < FIELD_ELEMENTS)) { vel += _field[index].val * deltaTime; // Particle influenced by field _field[index].val += vel * deltaTime * _coupling; // Field influenced by particle }} void Field::simulate(float deltaTime) { glm::vec3 neighbors, add, diff; for (int i = 0; i < FIELD_ELEMENTS; i++) { const float CONSTANT_DAMPING = 0.5f; _field[i].val *= (1.f - CONSTANT_DAMPING * deltaTime); }} void Field::render() { int i; float scale_view = 0.05f * _worldSize; glDisable(GL_LIGHTING); glBegin(GL_LINES); for (i = 0; i < FIELD_ELEMENTS; i++) { glColor3f(0, 1, 0); glVertex3fv(&_field[i].center.x); glVertex3f(_field[i].center.x + _field[i].val.x * scale_view, _field[i].center.y + _field[i].val.y * scale_view, _field[i].center.z + _field[i].val.z * scale_view); } glEnd(); glColor3f(0, 1, 0); glPointSize(4.0); glEnable(GL_POINT_SMOOTH); glBegin(GL_POINTS); for (i = 0; i < FIELD_ELEMENTS; i++) { glVertex3fv(&_field[i].center.x); } glEnd();}
//
// Field.cpp
// interface
//
// Created by Philip Rosedale on 8/23/12.
// Copyright (c) 2012 High Fidelity, Inc. All rights reserved.
//
// A vector-valued field over an array of elements arranged as a 3D lattice
#include "Field.h"
int Field::value(float *value, float *pos) {
int index = (int)(pos[0] / _worldSize * 10.0) +
(int)(pos[1] / _worldSize * 10.0) * 10 +
(int)(pos[2] / _worldSize * 10.0) * 100;
if ((index >= 0) && (index < FIELD_ELEMENTS)) {
value[0] = _field[index].val.x;
value[1] = _field[index].val.y;
value[2] = _field[index].val.z;
return 1;
} else {
return 0;
}
}
Field::Field(float worldSize, float coupling) {
_worldSize = worldSize;
_coupling = coupling;
//float fx, fy, fz;
for (int i = 0; i < FIELD_ELEMENTS; i++) {
const float FIELD_INITIAL_MAG = 0.0f;
_field[i].val = randVector() * FIELD_INITIAL_MAG * _worldSize;
_field[i].center.x = ((float)(i % 10) + 0.5f);
_field[i].center.y = ((float)(i % 100 / 10) + 0.5f);
_field[i].center.z = ((float)(i / 100) + 0.5f);
_field[i].center *= _worldSize / 10.f;
}
}
void Field::add(float* add, float *pos) {
int index = (int)(pos[0] / _worldSize * 10.0) +
(int)(pos[1] / _worldSize * 10.0) * 10 +
(int)(pos[2] / _worldSize * 10.0) * 100;
if ((index >= 0) && (index < FIELD_ELEMENTS)) {
_field[index].val.x += add[0];
_field[index].val.y += add[1];
_field[index].val.z += add[2];
}
}
void Field::interact(float deltaTime, const glm::vec3& pos, glm::vec3& vel) {
int index = (int)(pos.x / _worldSize * 10.0) +
(int)(pos.y / _worldSize*10.0) * 10 +
(int)(pos.z / _worldSize*10.0) * 100;
if ((index >= 0) && (index < FIELD_ELEMENTS)) {
vel += _field[index].val * deltaTime; // Particle influenced by field
_field[index].val += vel * deltaTime * _coupling; // Field influenced by particle
}
}
void Field::simulate(float deltaTime) {
glm::vec3 neighbors, add, diff;
for (int i = 0; i < FIELD_ELEMENTS; i++) {
const float CONSTANT_DAMPING = 0.5f;
_field[i].val *= (1.f - CONSTANT_DAMPING * deltaTime);
}
}
void Field::render() {
int i;
float scale_view = 0.05f * _worldSize;
glDisable(GL_LIGHTING);
glBegin(GL_LINES);
for (i = 0; i < FIELD_ELEMENTS; i++) {
glColor3f(0, 1, 0);
glVertex3fv(&_field[i].center.x);
glVertex3f(_field[i].center.x + _field[i].val.x * scale_view,
_field[i].center.y + _field[i].val.y * scale_view,
_field[i].center.z + _field[i].val.z * scale_view);
}
glEnd();
glColor3f(0, 1, 0);
glPointSize(4.0);
glEnable(GL_POINT_SMOOTH);
glBegin(GL_POINTS);
for (i = 0; i < FIELD_ELEMENTS; i++) {
glVertex3fv(&_field[i].center.x);
}
glEnd();
}