数学デッサン教室 – ページ 2 – プログラミング de 落描き

2021年4月14日2021年4月14日

Change ring size. Draw by openFrameworks

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Change ring size.

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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 mouseEntered(int x, int y) {};
	void mouseExited(int x, int y) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	glm::vec3 make_point(float R, float r, float u, float v);

	ofEasyCam cam;
	ofMesh face, frame;

	float r;
};

#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 mouseEntered(int x, int y) {};

void mouseExited(int x, int y) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

glm::vec3 make_point(float R, float r, float u, float v);

ofEasyCam cam;

ofMesh face, frame;

float r;

};

#include "ofApp.h"	

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(60);
	ofSetWindowTitle("openFrameworks");

	ofBackground(239);
	ofSetLineWidth(1.5);
	ofEnableDepthTest();

	this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
}

//--------------------------------------------------------------
void ofApp::update() {

	ofSeedRandom(39);

	this->face.clear();
	this->frame.clear();

	float R = 300;
	this->r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 10, 130);
	int v_span = 8;
	int u_span = 10;

	for (int v = 0; v < 360; v += v_span) {

		for (auto u = 0; u < 360; u += u_span) {

			auto noise_value = ofNoise(glm::vec4(this->make_point(R, 50, u + u_span * 0.5, v) * 0.005, ofGetFrameNum() * 0.01));

			if (noise_value > 0.6) {

				vector<glm::vec3> vertices;
				vertices.push_back(this->make_point(R, this->r, u, v - v_span * 0.5));
				vertices.push_back(this->make_point(R, this->r, u + u_span, v - v_span * 0.5));
				vertices.push_back(this->make_point(R, this->r, u + u_span, v + v_span * 0.5));
				vertices.push_back(this->make_point(R, this->r, u, v + v_span * 0.5));

				int index = face.getNumVertices();
				this->face.addVertices(vertices);

				this->face.addIndex(index + 0); face.addIndex(index + 1); face.addIndex(index + 2);
				this->face.addIndex(index + 0); face.addIndex(index + 2); face.addIndex(index + 3);

				this->frame.addVertices(vertices);

				this->frame.addIndex(index + 0); this->frame.addIndex(index + 1);
				this->frame.addIndex(index + 1); this->frame.addIndex(index + 2);
				this->frame.addIndex(index + 2); this->frame.addIndex(index + 3);
				this->frame.addIndex(index + 3); this->frame.addIndex(index + 0);
			}
		}
	}
}

//--------------------------------------------------------------
void ofApp::draw() {

	this->cam.begin();

	int number = 300;
	vector<glm::vec3> location_list(number);
	for (int i = 0; i < number; i++) {

		auto R = 300;
		auto tmp_r = ofRandom(10, this->r * 0.8);
		auto u = ofRandom(360) + ofGetFrameNum() * ofRandom(0.5, 1.0) * (ofRandom(1) < 0.5 ? 1 : -1);
		auto v = ofRandom(360) + ofGetFrameNum() * ofRandom(0.5, 1.0) * (ofRandom(1) < 0.5 ? 1 : -1);

		location_list[i] = this->make_point(R, tmp_r, u, v);
	}

	ofFill();
	ofSetColor(39);
	for (auto& location : location_list) {

		ofDrawSphere(location, 3);
		for (auto& other : location_list) {

			if (location == other) { continue; }

			auto distance = glm::distance(location, other);
			if (distance < 40) {

				ofDrawLine(location, other);
			}
		}
	}

	ofSetColor(239);
	this->face.draw();

	ofSetColor(39);
	this->frame.drawWireframe();

	this->cam.end();
}

//--------------------------------------------------------------
glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

	// 数学デッサン教室 描いて楽しむ数学たち　P.31

	u *= DEG_TO_RAD;
	v *= DEG_TO_RAD;

	auto x = (R + r * cos(u)) * cos(v);
	auto y = (R + r * cos(u)) * sin(v);
	auto z = r * sin(u);

	return glm::vec3(x, y, z);
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

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#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetLineWidth(1.5);

ofEnableDepthTest();

this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

}

//--------------------------------------------------------------

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

this->frame.clear();

float R = 300;

this->r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 10, 130);

int v_span = 8;

int u_span = 10;

for (int v = 0; v < 360; v += v_span) {

for (auto u = 0; u < 360; u += u_span) {

auto noise_value = ofNoise(glm::vec4(this->make_point(R, 50, u + u_span * 0.5, v) * 0.005, ofGetFrameNum() * 0.01));

if (noise_value > 0.6) {

vector<glm::vec3> vertices;

vertices.push_back(this->make_point(R, this->r, u, v - v_span * 0.5));

vertices.push_back(this->make_point(R, this->r, u + u_span, v - v_span * 0.5));

vertices.push_back(this->make_point(R, this->r, u + u_span, v + v_span * 0.5));

vertices.push_back(this->make_point(R, this->r, u, v + v_span * 0.5));

int index = face.getNumVertices();

this->face.addVertices(vertices);

this->face.addIndex(index + 0); face.addIndex(index + 1); face.addIndex(index + 2);

this->face.addIndex(index + 0); face.addIndex(index + 2); face.addIndex(index + 3);

this->frame.addVertices(vertices);

this->frame.addIndex(index + 0); this->frame.addIndex(index + 1);

this->frame.addIndex(index + 1); this->frame.addIndex(index + 2);

this->frame.addIndex(index + 2); this->frame.addIndex(index + 3);

this->frame.addIndex(index + 3); this->frame.addIndex(index + 0);

}

//--------------------------------------------------------------

void ofApp::draw() {

this->cam.begin();

int number = 300;

vector<glm::vec3> location_list(number);

for (int i = 0; i < number; i++) {

auto R = 300;

auto tmp_r = ofRandom(10, this->r * 0.8);

auto u = ofRandom(360) + ofGetFrameNum() * ofRandom(0.5, 1.0) * (ofRandom(1) < 0.5 ? 1 : -1);

auto v = ofRandom(360) + ofGetFrameNum() * ofRandom(0.5, 1.0) * (ofRandom(1) < 0.5 ? 1 : -1);

location_list[i] = this->make_point(R, tmp_r, u, v);

}

ofFill();

ofSetColor(39);

for (auto& location : location_list) {

ofDrawSphere(location, 3);

for (auto& other : location_list) {

if (location == other) { continue; }

auto distance = glm::distance(location, other);

if (distance < 40) {

ofDrawLine(location, other);

}

ofSetColor(239);

this->face.draw();

ofSetColor(39);

this->frame.drawWireframe();

this->cam.end();

}

//--------------------------------------------------------------

glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

// 数学デッサン教室描いて楽しむ数学たち　P.31

u *= DEG_TO_RAD;

v *= DEG_TO_RAD;

auto x = (R + r * cos(u)) * cos(v);

auto y = (R + r * cos(u)) * sin(v);

auto z = r * sin(u);

return glm::vec3(x, y, z);

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210414

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2021年3月8日2021年3月7日

Vanishing torus. Draw by openFrameworks

[ Video ]

[ About ]
Vanishing torus.

[ Source ]

#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_point(float R, float r, float u, float v);

	ofEasyCam cam;
	ofMesh face, frame;
};

#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_point(float R, float r, float u, float v);

ofEasyCam cam;

ofMesh face, frame;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(30);
	ofSetWindowTitle("openFrameworks");

	ofBackground(239);
	ofSetLineWidth(3);
	ofEnableDepthTest();

	this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
}

//--------------------------------------------------------------
void ofApp::update() {

	ofSeedRandom(39);

	this->face.clear();
	this->frame.clear();

	float phi_deg_step = 6;
	float theta_deg_step = 6;

	int R_start = (ofGetFrameNum() * 4) % 350 + 30;
	for (int R_param = R_start; R_param < R_start + 350; R_param += 80) {

		int R = R_param % 350 + 30;
		float r = R * 0.13;

		auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, PI * -5, PI * 5), glm::vec3(0, 1, 0));
		auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, PI * -5, PI * 5), glm::vec3(1, 0, 0));

		for (float phi_deg = 0; phi_deg < 360; phi_deg += phi_deg_step) {

			for (float theta_deg = 0; theta_deg < 360; theta_deg += theta_deg_step) {

				float threshold = ofMap(R, 30, 350, 0, 1);
				auto noise_value = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg) * 0.005));
				if (noise_value < threshold) { continue; }

				auto noise_1 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg - theta_deg_step, phi_deg) * 0.005));
				auto noise_2 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg + phi_deg_step) * 0.005));
				auto noise_3 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg - phi_deg_step) * 0.005));
				auto noise_4 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg + theta_deg_step, phi_deg) * 0.005));

				auto index = this->face.getNumVertices();
				vector<glm::vec3> vertices;

				vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg - theta_deg_step * 0.5, phi_deg - phi_deg_step * 0.5)));
				vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg + theta_deg_step * 0.5, phi_deg - phi_deg_step * 0.5)));
				vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg - theta_deg_step * 0.5, phi_deg + phi_deg_step * 0.5)));
				vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg + theta_deg_step * 0.5, phi_deg + phi_deg_step * 0.5)));

				for (auto& vertex : vertices) {

					vertex = glm::vec4(vertex, 0) * rotation_y * rotation_x;
				}

				this->face.addVertices(vertices);

				this->face.addIndex(index + 0); this->face.addIndex(index + 1); this->face.addIndex(index + 3);
				this->face.addIndex(index + 0); this->face.addIndex(index + 3); this->face.addIndex(index + 2);

				if (noise_1 < threshold) {

					this->frame.addVertex(vertices[0]);
					this->frame.addVertex(vertices[2]);

					this->frame.addIndex(this->frame.getNumVertices() - 1);
					this->frame.addIndex(this->frame.getNumVertices() - 2);
				}

				if (noise_2 < threshold) {

					this->frame.addVertex(vertices[2]);
					this->frame.addVertex(vertices[3]);

					this->frame.addIndex(this->frame.getNumVertices() - 1);
					this->frame.addIndex(this->frame.getNumVertices() - 2);
				}

				if (noise_3 < threshold) {

					this->frame.addVertex(vertices[0]);
					this->frame.addVertex(vertices[1]);

					this->frame.addIndex(this->frame.getNumVertices() - 1);
					this->frame.addIndex(this->frame.getNumVertices() - 2);
				}

				if (noise_4 < threshold) {

					this->frame.addVertex(vertices[1]);
					this->frame.addVertex(vertices[3]);

					this->frame.addIndex(this->frame.getNumVertices() - 1);
					this->frame.addIndex(this->frame.getNumVertices() - 2);

				}
			}
		}
	}
}

//--------------------------------------------------------------
void ofApp::draw() {

	this->cam.begin();

	ofSetColor(255);
	this->frame.draw();

	ofSetColor(39);
	this->face.draw();

	this->cam.end();
}

//--------------------------------------------------------------
glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

	// 数学デッサン教室 描いて楽しむ数学たち　P.31

	u *= DEG_TO_RAD;
	v *= DEG_TO_RAD;

	auto x = (R + r * cos(u)) * cos(v);
	auto y = (R + r * cos(u)) * sin(v);
	auto z = r * sin(u);

	return glm::vec3(x, y, z);
}


//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

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#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(30);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetLineWidth(3);

ofEnableDepthTest();

this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

}

//--------------------------------------------------------------

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

this->frame.clear();

float phi_deg_step = 6;

float theta_deg_step = 6;

int R_start = (ofGetFrameNum() * 4) % 350 + 30;

for (int R_param = R_start; R_param < R_start + 350; R_param += 80) {

int R = R_param % 350 + 30;

float r = R * 0.13;

auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, PI * -5, PI * 5), glm::vec3(0, 1, 0));

auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, PI * -5, PI * 5), glm::vec3(1, 0, 0));

for (float phi_deg = 0; phi_deg < 360; phi_deg += phi_deg_step) {

for (float theta_deg = 0; theta_deg < 360; theta_deg += theta_deg_step) {

float threshold = ofMap(R, 30, 350, 0, 1);

auto noise_value = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg) * 0.005));

if (noise_value < threshold) { continue; }

auto noise_1 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg - theta_deg_step, phi_deg) * 0.005));

auto noise_2 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg + phi_deg_step) * 0.005));

auto noise_3 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg, phi_deg - phi_deg_step) * 0.005));

auto noise_4 = ofNoise(glm::vec3(this->make_point(300, 80, theta_deg + theta_deg_step, phi_deg) * 0.005));

auto index = this->face.getNumVertices();

vector<glm::vec3> vertices;

vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg - theta_deg_step * 0.5, phi_deg - phi_deg_step * 0.5)));

vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg + theta_deg_step * 0.5, phi_deg - phi_deg_step * 0.5)));

vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg - theta_deg_step * 0.5, phi_deg + phi_deg_step * 0.5)));

vertices.push_back(glm::vec3(this->make_point(R, r, theta_deg + theta_deg_step * 0.5, phi_deg + phi_deg_step * 0.5)));

for (auto& vertex : vertices) {

vertex = glm::vec4(vertex, 0) * rotation_y * rotation_x;

}

this->face.addVertices(vertices);

this->face.addIndex(index + 0); this->face.addIndex(index + 1); this->face.addIndex(index + 3);

this->face.addIndex(index + 0); this->face.addIndex(index + 3); this->face.addIndex(index + 2);

if (noise_1 < threshold) {

this->frame.addVertex(vertices[0]);

this->frame.addVertex(vertices[2]);

this->frame.addIndex(this->frame.getNumVertices() - 1);

this->frame.addIndex(this->frame.getNumVertices() - 2);

}

if (noise_2 < threshold) {

this->frame.addVertex(vertices[2]);

this->frame.addVertex(vertices[3]);

this->frame.addIndex(this->frame.getNumVertices() - 1);

this->frame.addIndex(this->frame.getNumVertices() - 2);

}

if (noise_3 < threshold) {

this->frame.addVertex(vertices[0]);

this->frame.addVertex(vertices[1]);

this->frame.addIndex(this->frame.getNumVertices() - 1);

this->frame.addIndex(this->frame.getNumVertices() - 2);

}

if (noise_4 < threshold) {

this->frame.addVertex(vertices[1]);

this->frame.addVertex(vertices[3]);

this->frame.addIndex(this->frame.getNumVertices() - 1);

this->frame.addIndex(this->frame.getNumVertices() - 2);

}

//--------------------------------------------------------------

void ofApp::draw() {

this->cam.begin();

ofSetColor(255);

this->frame.draw();

ofSetColor(39);

this->face.draw();

this->cam.end();

}

//--------------------------------------------------------------

glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

// 数学デッサン教室描いて楽しむ数学たち　P.31

u *= DEG_TO_RAD;

v *= DEG_TO_RAD;

auto x = (R + r * cos(u)) * cos(v);

auto y = (R + r * cos(u)) * sin(v);

auto z = r * sin(u);

return glm::vec3(x, y, z);

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210308

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2021年1月27日2021年1月27日

Shell and noise. Draw by openFrameworks

[ Video ]

[ About ]
Shell and noise.

[ Source ]

#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;
};

#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;

};

#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());
}

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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());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210127

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