数学デッサン教室 – ページ 3 – プログラミング de 落描き

2021年1月25日2021年1月25日

Torus broken. Draw by openFrameworks

[ Video ]

[ About ]
Torus broken.

[ 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(60);
	ofSetWindowTitle("openFrameworks");

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

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

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

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

	float phi_deg_step = 6;
	float theta_deg_step = 6;
	float R = 300;
	float r = 80;

	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) {

			auto noise_value = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg) * 0.005, ofGetFrameNum() * 0.02));
			if (noise_value < 0.5) { continue; }

			auto noise_1 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg - theta_deg_step, phi_deg) * 0.005, ofGetFrameNum() * 0.02));
			auto noise_2 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg + phi_deg_step) * 0.005, ofGetFrameNum() * 0.02));
			auto noise_3 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg - phi_deg_step) * 0.005, ofGetFrameNum() * 0.02));
			auto noise_4 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg + theta_deg_step, phi_deg) * 0.005, ofGetFrameNum() * 0.02));

			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)));

			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 < 0.5) {

				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 < 0.5) {

				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 < 0.5) {

				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 < 0.5) {

				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();
	ofRotateX(ofGetFrameNum() * 0.37);
	ofRotateY(ofGetFrameNum() * 0.72);

	ofSetColor(39, 239, 239);
	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(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetLineWidth(3);

ofEnableDepthTest();

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

}

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

void ofApp::update() {

this->face.clear();

this->frame.clear();

float phi_deg_step = 6;

float theta_deg_step = 6;

float R = 300;

float r = 80;

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) {

auto noise_value = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg) * 0.005, ofGetFrameNum() * 0.02));

if (noise_value < 0.5) { continue; }

auto noise_1 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg - theta_deg_step, phi_deg) * 0.005, ofGetFrameNum() * 0.02));

auto noise_2 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg + phi_deg_step) * 0.005, ofGetFrameNum() * 0.02));

auto noise_3 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg, phi_deg - phi_deg_step) * 0.005, ofGetFrameNum() * 0.02));

auto noise_4 = ofNoise(glm::vec4(this->make_point(R, r, theta_deg + theta_deg_step, phi_deg) * 0.005, ofGetFrameNum() * 0.02));

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)));

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 < 0.5) {

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 < 0.5) {

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 < 0.5) {

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 < 0.5) {

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();

ofRotateX(ofGetFrameNum() * 0.37);

ofRotateY(ofGetFrameNum() * 0.72);

ofSetColor(39, 239, 239);

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/Insta20210125

2021年1月24日

Noise-eaten apple. Draw by openFrameworks

[ Video ]

[ About ]
Noise-eaten apple.

[ 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_apple_point(float u, float v);

	ofEasyCam cam;
	ofMesh mesh;
};

#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_apple_point(float u, float v);

ofEasyCam cam;

ofMesh mesh;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	ofBackground(239);
	ofSetLineWidth(2);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
	this->mesh.clear();

	int span = 8;
	int index;
	for (int scale = 20; scale <= 25; scale += 1) {

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

			for (int u = -170; u < 250; u += span) {

				auto noise_seed = scale * (this->make_apple_point(u - span * 0.5, v - span * 0.5) + this->make_apple_point(u - span * 0.5, v + span * 0.5) + this->make_apple_point(u + span * 0.5, v + span * 0.5)) / 3;
				auto noise_value = ofNoise(glm::vec4(noise_seed * 0.008, ofGetFrameNum() * 0.008));
				if (noise_value < 0.55) {

					index = this->mesh.getNumVertices();

					this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v - span * 0.5) * scale);
					this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v + span * 0.5) * scale);
					this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v + span * 0.5) * scale);

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

				noise_seed = scale * (this->make_apple_point(u - span * 0.5, v - span * 0.5) + this->make_apple_point(u + span * 0.5, v - span * 0.5) + this->make_apple_point(u + span * 0.5, v + span * 0.5)) / 3;
				noise_value = ofNoise(glm::vec4(noise_seed * 0.008, ofGetFrameNum() * 0.008));

				if (noise_value < 0.55) {

					index = this->mesh.getNumVertices();

					this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v - span * 0.5) * scale);
					this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v - span * 0.5) * scale);
					this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v + span * 0.5) * scale);

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

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

	this->cam.begin();
	ofRotateZ(ofGetFrameNum() * 0.5);

	ofSetColor(239, 39, 39);
	this->mesh.drawFaces();

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

	this->cam.end();
}

//--------------------------------------------------------------
glm::vec3 ofApp::make_apple_point(float u, float v) {

	// 数学デッサン教室 描いて楽しむ数学たち リンゴ局面 apple surface P.33 

	u *= DEG_TO_RAD;
	v *= DEG_TO_RAD;

	float x = (4 + 3.8 * cos(u)) * cos(v);
	float y = (4 + 3.8 * cos(u)) * sin(v);
	float z = -5 * log10(1 - 0.315 * u) + 5 * sin(u) + 2 * cos(u);

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

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetLineWidth(2);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

this->mesh.clear();

int span = 8;

int index;

for (int scale = 20; scale <= 25; scale += 1) {

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

for (int u = -170; u < 250; u += span) {

auto noise_seed = scale * (this->make_apple_point(u - span * 0.5, v - span * 0.5) + this->make_apple_point(u - span * 0.5, v + span * 0.5) + this->make_apple_point(u + span * 0.5, v + span * 0.5)) / 3;

auto noise_value = ofNoise(glm::vec4(noise_seed * 0.008, ofGetFrameNum() * 0.008));

if (noise_value < 0.55) {

index = this->mesh.getNumVertices();

this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v - span * 0.5) * scale);

this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v + span * 0.5) * scale);

this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v + span * 0.5) * scale);

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

}

noise_seed = scale * (this->make_apple_point(u - span * 0.5, v - span * 0.5) + this->make_apple_point(u + span * 0.5, v - span * 0.5) + this->make_apple_point(u + span * 0.5, v + span * 0.5)) / 3;

noise_value = ofNoise(glm::vec4(noise_seed * 0.008, ofGetFrameNum() * 0.008));

if (noise_value < 0.55) {

index = this->mesh.getNumVertices();

this->mesh.addVertex(this->make_apple_point(u - span * 0.5, v - span * 0.5) * scale);

this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v - span * 0.5) * scale);

this->mesh.addVertex(this->make_apple_point(u + span * 0.5, v + span * 0.5) * scale);

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

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateZ(ofGetFrameNum() * 0.5);

ofSetColor(239, 39, 39);

this->mesh.drawFaces();

ofSetColor(39);

this->mesh.drawWireframe();

this->cam.end();

}

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

glm::vec3 ofApp::make_apple_point(float u, float v) {

// 数学デッサン教室描いて楽しむ数学たちリンゴ局面 apple surface P.33

u *= DEG_TO_RAD;

v *= DEG_TO_RAD;

float x = (4 + 3.8 * cos(u)) * cos(v);

float y = (4 + 3.8 * cos(u)) * sin(v);

float z = -5 * log10(1 - 0.315 * u) + 5 * sin(u) + 2 * cos(u);

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

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210124

2020年11月10日2020年11月10日

Shelter. Draw by openFrameworks

[ Video ]

[ About ]
隠れ家。

Shelter.

[ 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 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;
};

#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;

};

#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;
	float r = 90;
	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, r, u + u_span * 0.5, v) * 0.005, ofGetFrameNum() * 0.01));

			if (noise_value > 0.5) {

				vector<glm::vec3> vertices;
				vertices.push_back(this->make_point(R, r, u, v - v_span * 0.5));
				vertices.push_back(this->make_point(R, r, u + u_span, v - v_span * 0.5));
				vertices.push_back(this->make_point(R, r, u + u_span, v + v_span * 0.5));
				vertices.push_back(this->make_point(R, 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 r = ofRandom(30, 60);
		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, 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;

float r = 90;

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, r, u + u_span * 0.5, v) * 0.005, ofGetFrameNum() * 0.01));

if (noise_value > 0.5) {

vector<glm::vec3> vertices;

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

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

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

vertices.push_back(this->make_point(R, 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 r = ofRandom(30, 60);

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, 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/Insta20201110

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