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お互いに反発するパーティクルを箱に閉じ込めました。普段は見えませんが、お互いが近づくと姿を現します。その性質により箱へ干渉する事で一斉に姿を現します。
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#pragma once #include "ofMain.h" #include "ofxBullet.h" class ofApp : public ofBaseApp { public: void setup(); void update(); void draw(); void keyPressed(int key) {}; void keyReleased(int key) {}; void mouseMoved(int x, int y) {}; void mouseDragged(int x, int y, int button) {}; void mousePressed(int x, int y, int button) {}; void mouseReleased(int x, int y, int button) {}; void windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; ofCamera cam; ofxBulletWorldRigid world; unique_ptr<ofxBulletCustomShape> bounds_shape; vector<unique_ptr<ofxBulletSphere>> spheres; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofBackground(39); ofSetWindowTitle("Insta"); ofEnableDepthTest(); // Initialize ofxBulletWorld this->cam.setPosition(ofVec3f(0, 3.f, -30.f)); this->cam.lookAt(ofVec3f(0, 0, 0), ofVec3f(0, -1, 0)); this->world.setup(); this->world.enableGrabbing(); this->world.setCamera(&this->cam); this->world.setGravity(ofVec3f()); // Create Big Box ofVec3f start_location; ofPoint dimens; float bounds_width = 400; float h_width = bounds_width * 0.5; float depth = 10.; float h_depth = depth * 0.5; this->bounds_shape.reset(new ofxBulletCustomShape()); this->bounds_shape->create(world.world, ofVec3f(0, 0, 0), 10.); for (int i = 0; i < 6; i++) { if (i == 0) { // ground // start_location.set(0., h_width + h_depth, 0.); dimens.set(bounds_width, depth, bounds_width); } else if (i == 1) { // back wall // start_location.set(0, 0, h_width + h_depth); dimens.set(bounds_width, bounds_width, depth); } else if (i == 2) { // right wall // start_location.set(h_width + h_depth, 0, 0.); dimens.set(depth, bounds_width, bounds_width); } else if (i == 3) { // left wall // start_location.set(-h_width - h_depth, 0, 0.); dimens.set(depth, bounds_width, bounds_width); } else if (i == 4) { // ceiling // start_location.set(0, -h_width - h_depth, 0.); dimens.set(bounds_width, depth, bounds_width); } else if (i == 5) { // front wall // start_location.set(0, 0, -h_width - h_depth); dimens.set(bounds_width, bounds_width, depth); } btBoxShape* boxShape = ofBtGetBoxCollisionShape(dimens.x, dimens.y, dimens.z); this->bounds_shape->addShape(boxShape, start_location); } this->bounds_shape->add(); // Create Spheres for (int i = 0; i < 255; i++) { unique_ptr<ofxBulletSphere> sphere(new ofxBulletSphere); float size = 5; sphere->create(this->world.world, ofVec3f(ofRandom(-100, 100), ofRandom(-100, 100), ofRandom(-100, 100)), 1, size); sphere->setRestitution(1.0); sphere->add(); this->spheres.push_back(move(sphere)); } } //-------------------------------------------------------------- void ofApp::update() { // Big Box Moving To Center if (!ofGetMousePressed()) { ofVec3f diff = ofVec3f(0, 0, 0) - bounds_shape->getPosition(); diff *= 500.f; bounds_shape->applyCentralForce(diff); } // Compute Spheres Relation for (int i = 0; i < this->spheres.size(); i++) { for (int j = i + 1; j < this->spheres.size(); j++) { float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition()); if (distance < 80) { ofVec3f diff = this->spheres[i]->getPosition() - this->spheres[j]->getPosition(); ofMap(distance, 0, 50, 40, -2); this->spheres[i]->applyCentralForce(diff); this->spheres[j]->applyCentralForce(-diff); } } } this->world.update(); } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2); // Draw Big Box ofNoFill(); if (ofGetMousePressed()) { ofSetColor(39, 39, 239); } else { ofSetColor(239); } bounds_shape->transformGL(); ofDrawBox(ofVec3f(0, 0, 0), 400); bounds_shape->restoreTransformGL(); // Draw Sphere ofFill(); for (int i = 0; i < this->spheres.size(); i++) { for (int j = i + 1; j < this->spheres.size(); j++) { float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition()); if (distance < 30) { ofSetColor(239); ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition()); ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius()); ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius()); } else if (distance < 60) { ofSetColor(239, ofMap(distance, 30, 60, 255, 0)); ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition()); ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius()); ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius()); } } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |