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球体から生える線。
Growing line from sphere.
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#pragma once #include "ofMain.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) {}; void setLineToMesh(ofMesh& mesh, float start_radius, float end_radius); ofEasyCam cam; ofColor color; ofMesh mesh; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetLineWidth(2); ofEnableDepthTest(); this->color = ofColor(39); this->mesh.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); this->mesh.clear(); for (auto i = 0; i < 150; i++) { this->setLineToMesh(this->mesh, 30, 250); } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofRotateY(ofGetFrameNum() * 0.5); this->mesh.drawWireframe(); ofSetColor(this->color); ofDrawSphere(glm::vec3(), 50); this->cam.end(); } //-------------------------------------------------------------- void ofApp::setLineToMesh(ofMesh& mesh, float start_radius, float end_radius) { int start_index = mesh.getVertices().size(); auto noise_seed_x = ofRandom(1000); auto noise_seed_y = ofRandom(1000); auto noise_seed_z = ofRandom(1000); auto base_deg = ofRandom(360); for (auto radius = start_radius; radius < end_radius; radius += 5) { auto location = glm::vec3(radius * cos(base_deg * DEG_TO_RAD), radius * sin(base_deg * DEG_TO_RAD), 0); auto angle_x = ofMap(ofNoise(noise_seed_x, radius * 0.0003 - ofGetFrameNum() * 0.0003), 0, 1, -PI * 2, PI * 2); auto rotation_x = glm::rotate(glm::mat4(), angle_x, glm::vec3(1, 0, 0)); auto angle_y = ofMap(ofNoise(noise_seed_y, radius * 0.0003 - ofGetFrameNum() * 0.0003), 0, 1, -PI * 2, PI * 2); auto rotation_y = glm::rotate(glm::mat4(), angle_y, glm::vec3(0, 1, 0)); auto angle_z = ofMap(ofNoise(noise_seed_z, radius * 0.0003 - ofGetFrameNum() * 0.0003), 0, 1, -PI * 2, PI * 2); auto rotation_z = glm::rotate(glm::mat4(), angle_z, glm::vec3(0, 0, 1)); mesh.addVertex(glm::vec4(location, 0) * rotation_z * rotation_y * rotation_x); auto threshold = start_radius + (end_radius - start_radius) * 0.6; if (radius > threshold) { mesh.addColor(ofColor(this->color, ofMap(radius, threshold, end_radius, 255, 0))); } else { mesh.addColor(this->color); } } for (auto i = start_index; i < mesh.getVertices().size() - 1; i++) { mesh.addIndex(i); mesh.addIndex(i + 1); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |