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Shell and noise.
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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) {}; glm::vec3 make_shell_point(float a, float b, float c, float h, float k, float u, float v, float w, int R); ofEasyCam cam; ofMesh face, line; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetLineWidth(1.5); ofEnableDepthTest(); this->line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); } //-------------------------------------------------------------- void ofApp::update() { // Parameter reference by https://twitter.com/ru_sack/status/798308368007892992 this->face.clear(); this->line.clear(); float a = 1.25; float b = 1.25; float c = 1.0; float h = 3.5; float k = 0; float w = 0.12; int R = 1; int scale = 40; float u_step = 0.3; int v_step = 15; int rotate_deg = ofGetFrameNum(); for (int x = -300; x <= 300; x += 300) { for (int y = -300; y <= 300; y += 300) { rotate_deg += 40; float angle = rotate_deg * (float)DEG_TO_RAD; auto rotation = glm::rotate(glm::mat4(), angle, glm::vec3(0, 1, 0)); for (float u = -35; u <= -1; u += u_step) { for (int v = 0; v <= 360; v += v_step) { auto noise_location = glm::vec2(x + cos(v * DEG_TO_RAD), y + sin(v * DEG_TO_RAD)); if (ofNoise(glm::vec4(u * 0.005, noise_location * 0.5, ofGetFrameNum() * 0.01)) < 0.5) { continue; } vector<glm::vec3> vertices; vertices.push_back(this->make_shell_point(a, b, c, h, k, u + u_step * 0.5, (v + v_step * 0.5) * DEG_TO_RAD, w, R) * scale); // -4 vertices.push_back(this->make_shell_point(a, b, c, h, k, u + u_step * 0.5, (v - v_step * 0.5) * DEG_TO_RAD, w, R) * scale); // -3 vertices.push_back(this->make_shell_point(a, b, c, h, k, u - u_step * 0.5, (v - v_step * 0.5) * DEG_TO_RAD, w, R) * scale); // -2 vertices.push_back(this->make_shell_point(a, b, c, h, k, u - u_step * 0.5, (v + v_step * 0.5) * DEG_TO_RAD, w, R) * scale); // -1 for (auto& vertex : vertices) { vertex = glm::vec3(x, y, 0) + glm::vec4(vertex, 0) * rotation; } this->face.addVertices(vertices); this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->face.getNumVertices() - 2); this->face.addIndex(this->face.getNumVertices() - 3); this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->face.getNumVertices() - 3); this->face.addIndex(this->face.getNumVertices() - 4); this->line.addVertices(vertices); this->line.addIndex(this->line.getNumVertices() - 1); this->line.addIndex(this->line.getNumVertices() - 2); this->line.addIndex(this->line.getNumVertices() - 1); this->line.addIndex(this->line.getNumVertices() - 4); this->line.addIndex(this->line.getNumVertices() - 3); this->line.addIndex(this->line.getNumVertices() - 2); this->line.addIndex(this->line.getNumVertices() - 3); this->line.addIndex(this->line.getNumVertices() - 4); } } } } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofSetColor(239); this->face.draw(); ofSetColor(39); this->line.draw(); this->cam.end(); } //-------------------------------------------------------------- glm::vec3 ofApp::make_shell_point(float a, float b, float c, float h, float k, float u, float v, float w, int R) { // 数学デッサン教室 描いて楽しむ数学たち 貝殻の形 shape of shell P.59 float x = (h + a * cos(v)) * exp(w * u) * cos(c * u); float y = R * (h + a * cos(v)) * exp(w * u) * sin(c * u); float z = (k + b * sin(v)) * exp(w * u); return glm::vec3(x, y, z); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |