ofMesh – ページ 104 – プログラミング de 落描き

2021年9月24日2021年9月24日

Colorful torus. Draw by openFrameworks

[ Video ]

[ About ]
ループ内でofSeedRandom()を呼び出して同じランダム値を得る。

Call ofSeedRandom() in the loop to get the same random value.

[ 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;
};

#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;

};

#include "ofApp.h"

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

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

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

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

	ofSeedRandom(39);
}

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

	this->cam.begin();

	int v_span = 1;
	int u_span = 30;

	ofMesh face, line;
	ofColor color;
	line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
	for (int v = 0; v <= 360; v += v_span) {

		bool flag = true;
		int u_start = v;
		int next_u = u_start + v_span;

		ofSeedRandom(39);
		for (int u = u_start; u < u_start + 360; u += u_span) {

			auto noise_param = ofRandom(1000);

			if (flag) {

				face.addVertex(this->make_point(230, 60, u, v));
				face.addVertex(this->make_point(230, 60, u + u_span, v));
				face.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));
				face.addVertex(this->make_point(230, 60, next_u, v + v_span));

				line.addVertex(this->make_point(230, 60, u, v));
				line.addVertex(this->make_point(230, 60, u + u_span, v));
				line.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));
				line.addVertex(this->make_point(230, 60, next_u, v + v_span));

				for (int i = 0; i < 4; i++) {

					color.setHsb((int)ofMap(ofNoise(glm::vec4(face.getVertex(face.getNumVertices() - 4 + i) * 0.0005, noise_param + ofGetFrameNum() * 0.003)), 0, 1, 0, 255 * 6) % 255, 130, 255);
					face.addColor(color);
					line.addColor(ofColor(239));
				}

				face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 3);
				face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

				line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 4);
				line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 3);
			}

			next_u += u_span;
		    flag = !flag;
		}
	}

	face.drawFaces();
	line.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());
}

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetLineWidth(2);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

int v_span = 1;

int u_span = 30;

ofMesh face, line;

ofColor color;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

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

bool flag = true;

int u_start = v;

int next_u = u_start + v_span;

ofSeedRandom(39);

for (int u = u_start; u < u_start + 360; u += u_span) {

auto noise_param = ofRandom(1000);

if (flag) {

face.addVertex(this->make_point(230, 60, u, v));

face.addVertex(this->make_point(230, 60, u + u_span, v));

face.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));

face.addVertex(this->make_point(230, 60, next_u, v + v_span));

line.addVertex(this->make_point(230, 60, u, v));

line.addVertex(this->make_point(230, 60, u + u_span, v));

line.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));

line.addVertex(this->make_point(230, 60, next_u, v + v_span));

for (int i = 0; i < 4; i++) {

color.setHsb((int)ofMap(ofNoise(glm::vec4(face.getVertex(face.getNumVertices() - 4 + i) * 0.0005, noise_param + ofGetFrameNum() * 0.003)), 0, 1, 0, 255 * 6) % 255, 130, 255);

face.addColor(color);

line.addColor(ofColor(239));

}

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 3);

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 4);

line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 3);

}

next_u += u_span;

flag = !flag;

}

face.drawFaces();

line.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/Insta20210924

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年9月19日

Warped numbers. Draw by openFrameworks

[ Video ]

[ About ]
数字の文字座標を回転させる。

Rotate the character coordinates of a number.

[ 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) {};

	ofEasyCam cam;
	ofTrueTypeFont font;
};

#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) {};

ofEasyCam cam;

ofTrueTypeFont font;

};

#include "ofApp.h"

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

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

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

	this->font.loadFont("fonts/Kazesawa-Bold.ttf", 50, true, true, true);
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();
	ofRotateX(270);

	vector<string> word_list = {
		"0", "1", "2", "3",
		"6", "5", "4",
		"7", "8", "9", "0"
	};

	for (int base_deg = 0; base_deg < 360; base_deg += 30) {

		for (int y = -240 - 60; y < 300; y += 60) {

			int word_index = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0001), 0, 1, 0, word_list.size());
			auto word = word_list[word_index];

			int sample_count = 60;
			vector<ofPath> word_path = this->font.getStringAsPoints(word, true, false);
			for (int word_index = 0; word_index < word_path.size(); word_index++) {

				vector<ofPolyline> outline = word_path[word_index].getOutline();
				for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

					outline[outline_index] = outline[outline_index].getResampledByCount(sample_count);
					vector<glm::vec3> vertices = outline[outline_index].getVertices();
					vector<glm::vec3> mesh_vertices;
					vector<glm::vec3> base_location_list;
					vector<glm::highp_mat4x4> rotate_vertices;

					for (int vertices_index = 0; vertices_index < vertices.size(); vertices_index++) {

						auto base_location = glm::vec3(0, y, 100);
						base_location += glm::vec3(this->font.stringWidth(word_list[word_index]) * 0.5, this->font.stringHeight(word_list[word_index]) * 0.5, 0);

						auto deg = base_deg + ofMap(ofNoise((base_location.y + vertices[vertices_index].y * -1) * 0.001 + ofGetFrameNum() * 0.008), 0, 1, -360, 360);

						auto rotation = glm::rotate(glm::mat4(), (float)(deg * DEG_TO_RAD), glm::vec3(0, 1, 0));
						auto location = vertices[vertices_index] - glm::vec3(this->font.stringWidth(word_list[word_index]) * 0.5, this->font.stringHeight(word_list[word_index]) * 0.5, 0);

						mesh_vertices.push_back(location);
						rotate_vertices.push_back(rotation);
						base_location_list.push_back(base_location);
					}

					ofMesh face, line;
					line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
					for (int k = 0; k < mesh_vertices.size(); k++) {

						face.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, -5), 0) * -rotate_vertices[k]);
						face.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, 5), 0) * -rotate_vertices[k]);

						line.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, -5), 0) * -rotate_vertices[k]);
						line.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, 5), 0) * -rotate_vertices[k]);

						if (k > 0) {

							face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 4);
							face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

							line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 3);
							line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 4);
						}
					}

					face.addIndex(face.getNumVertices() - 1); face.addIndex(0); face.addIndex(1);
					face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(2);

					line.addIndex(line.getNumVertices() - 1); line.addIndex(1);
					line.addIndex(line.getNumVertices() - 2); line.addIndex(0);

					ofSetColor(39);
					face.draw();

					ofSetColor(239);
					line.drawWireframe();
				}
			}
		}
	}

	this->cam.end();
}

//--------------------------------------------------------------
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(2);

ofEnableDepthTest();

this->font.loadFont("fonts/Kazesawa-Bold.ttf", 50, true, true, true);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateX(270);

vector<string> word_list = {

"0", "1", "2", "3",

"6", "5", "4",

"7", "8", "9", "0"

};

for (int base_deg = 0; base_deg < 360; base_deg += 30) {

for (int y = -240 - 60; y < 300; y += 60) {

int word_index = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0001), 0, 1, 0, word_list.size());

auto word = word_list[word_index];

int sample_count = 60;

vector<ofPath> word_path = this->font.getStringAsPoints(word, true, false);

for (int word_index = 0; word_index < word_path.size(); word_index++) {

vector<ofPolyline> outline = word_path[word_index].getOutline();

for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

outline[outline_index] = outline[outline_index].getResampledByCount(sample_count);

vector<glm::vec3> vertices = outline[outline_index].getVertices();

vector<glm::vec3> mesh_vertices;

vector<glm::vec3> base_location_list;

vector<glm::highp_mat4x4> rotate_vertices;

for (int vertices_index = 0; vertices_index < vertices.size(); vertices_index++) {

auto base_location = glm::vec3(0, y, 100);

base_location += glm::vec3(this->font.stringWidth(word_list[word_index]) * 0.5, this->font.stringHeight(word_list[word_index]) * 0.5, 0);

auto deg = base_deg + ofMap(ofNoise((base_location.y + vertices[vertices_index].y * -1) * 0.001 + ofGetFrameNum() * 0.008), 0, 1, -360, 360);

auto rotation = glm::rotate(glm::mat4(), (float)(deg * DEG_TO_RAD), glm::vec3(0, 1, 0));

auto location = vertices[vertices_index] - glm::vec3(this->font.stringWidth(word_list[word_index]) * 0.5, this->font.stringHeight(word_list[word_index]) * 0.5, 0);

mesh_vertices.push_back(location);

rotate_vertices.push_back(rotation);

base_location_list.push_back(base_location);

}

ofMesh face, line;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

for (int k = 0; k < mesh_vertices.size(); k++) {

face.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, -5), 0) * -rotate_vertices[k]);

face.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, 5), 0) * -rotate_vertices[k]);

line.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, -5), 0) * -rotate_vertices[k]);

line.addVertex(glm::vec4(base_location_list[k], 0) * rotate_vertices[k] + glm::vec4(mesh_vertices[k] + glm::vec3(0, 0, 5), 0) * -rotate_vertices[k]);

if (k > 0) {

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 4);

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 3);

line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 4);

}

face.addIndex(face.getNumVertices() - 1); face.addIndex(0); face.addIndex(1);

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(2);

line.addIndex(line.getNumVertices() - 1); line.addIndex(1);

line.addIndex(line.getNumVertices() - 2); line.addIndex(0);

ofSetColor(39);

face.draw();

ofSetColor(239);

line.drawWireframe();

}

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210919

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年9月18日

Random walk with barrier. Draw by openFrameworks

[ Video ]

[ About ]
トーラスの中を進むランダムウォーク。
座標の近い面を描写する。

A random walk through the torus.
Describes a surface with close coordinates.

[ 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;

	vector<vector<glm::vec3>> walker_log_list;
	vector<ofColor> walker_color_list;
};

#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;

vector<vector<glm::vec3>> walker_log_list;

vector<ofColor> walker_color_list;

};

#include "ofApp.h"	

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

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

	ofBackground(0);
	ofSetLineWidth(1.5);
	ofEnableDepthTest();

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

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

	ofSeedRandom(39);

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

	vector<ofColor> color_list;
	ofColor color;
	vector<int> hex_list = { 0xff0000, 0xffed00, 0xff0092, 0xc2ff00, 0x00c7f2, 0xc1f1fc, 0xebffac, 0xffc2e5 };
	for (auto hex : hex_list) {

		color.setHex(hex);
		color_list.push_back(color);
	}

	float R = 300;
	float r = 100;
	int v_span = 10;
	int u_span = 10;

	this->walker_log_list.clear();
	this->walker_color_list.clear();
	for (int i = 0; i < 15; i++) {

		vector<glm::vec3> walker_location_list;
		auto noise_param = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));
		auto step_u = ofRandom(1, 1.5);
		auto step_v = ofRandom(1, 1.5);
		for (int k = 0; k < 40; k++) {

			auto tmp_r = ofMap(ofNoise(noise_param.x, (ofGetFrameNum() * 0.01 + k) * 0.005), 0, 1, 80, 96);
			auto tmp_u = noise_param.y + (ofGetFrameNum() + k) * step_u;
			auto tmp_v = noise_param.z + (ofGetFrameNum() + k) * step_v;

			walker_location_list.push_back(this->make_point(R, tmp_r, tmp_u, tmp_v));
		}

		this->walker_log_list.push_back(walker_location_list);
		this->walker_color_list.push_back(color_list[(int)ofRandom(color_list.size())]);

	}

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

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

			auto location = this->make_point(R, r, u, v);
			auto flag = false;
			for (auto& walker_log : this->walker_log_list) {

				for (auto& walker_location : walker_log) {

					if (glm::distance(location, walker_location) < 35) {

						flag = true;
						break;
					}
				}
			}

			if (flag) {

				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();

	ofSetColor(0);
	this->face.draw();

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

	for (int i = 0; i < this->walker_log_list.size(); i++) {

		auto walker_log = this->walker_log_list[i];
		ofSetColor(this->walker_color_list[i]);

		ofFill();
		ofDrawSphere(walker_log.back(), 5);

		ofNoFill();
		ofBeginShape();
		for (auto& walker_location : walker_log) {

			ofVertex(walker_location);
		}
		ofEndShape();
	}

	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(0);

ofSetLineWidth(1.5);

ofEnableDepthTest();

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

}

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

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

this->frame.clear();

vector<ofColor> color_list;

ofColor color;

vector<int> hex_list = { 0xff0000, 0xffed00, 0xff0092, 0xc2ff00, 0x00c7f2, 0xc1f1fc, 0xebffac, 0xffc2e5 };

for (auto hex : hex_list) {

color.setHex(hex);

color_list.push_back(color);

}

float R = 300;

float r = 100;

int v_span = 10;

int u_span = 10;

this->walker_log_list.clear();

this->walker_color_list.clear();

for (int i = 0; i < 15; i++) {

vector<glm::vec3> walker_location_list;

auto noise_param = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));

auto step_u = ofRandom(1, 1.5);

auto step_v = ofRandom(1, 1.5);

for (int k = 0; k < 40; k++) {

auto tmp_r = ofMap(ofNoise(noise_param.x, (ofGetFrameNum() * 0.01 + k) * 0.005), 0, 1, 80, 96);

auto tmp_u = noise_param.y + (ofGetFrameNum() + k) * step_u;

auto tmp_v = noise_param.z + (ofGetFrameNum() + k) * step_v;

walker_location_list.push_back(this->make_point(R, tmp_r, tmp_u, tmp_v));

}

this->walker_log_list.push_back(walker_location_list);

this->walker_color_list.push_back(color_list[(int)ofRandom(color_list.size())]);

}

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

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

auto location = this->make_point(R, r, u, v);

auto flag = false;

for (auto& walker_log : this->walker_log_list) {

for (auto& walker_location : walker_log) {

if (glm::distance(location, walker_location) < 35) {

flag = true;

break;

}

if (flag) {

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();

ofSetColor(0);

this->face.draw();

ofSetColor(255);

this->frame.drawWireframe();

for (int i = 0; i < this->walker_log_list.size(); i++) {

auto walker_log = this->walker_log_list[i];

ofSetColor(this->walker_color_list[i]);

ofFill();

ofDrawSphere(walker_log.back(), 5);

ofNoFill();

ofBeginShape();

for (auto& walker_location : walker_log) {

ofVertex(walker_location);

}

ofEndShape();

}

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/Insta20210918

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