programming – ページ 278 – プログラミング de 落描き

2021年5月9日

Tracing tetrahedrons. Draw by openFrameworks

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[ About ]
Tracing tetrahedrons.

[ 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;
	ofMesh face, line;

	vector<ofColor> 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 windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofEasyCam cam;

ofMesh face, line;

vector<ofColor> color_list;

};

#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() {

	ofSeedRandom(39);

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

	auto len = 150;
	auto log = 315;
	auto param = 60;

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

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

		int face_index = this->face.getNumVertices();
		int line_index = this->line.getNumVertices();

		auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(1, 0, 0));
		auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(0, 1, 0));
		auto rotation_z = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.z, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(0, 0, 1));

		vector<glm::vec3> vertices;
		vertices.push_back(glm::vec4(param, param, param, 0) * rotation_z * rotation_y * rotation_z);
		vertices.push_back(glm::vec4(param, -param, -param, 0) * rotation_z * rotation_y * rotation_z);
		vertices.push_back(glm::vec4(-param, param, -param, 0) * rotation_z * rotation_y * rotation_z);
		vertices.push_back(glm::vec4(-param, -param, param, 0) * rotation_z * rotation_y * rotation_z);

		int deg = i + ofGetFrameNum();
		auto base_location = glm::vec3(
			500 * cos(deg * DEG_TO_RAD),
			500 * sin(deg * DEG_TO_RAD),
			0);

		for (auto& vertex : vertices) {

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

		this->line.addVertices(vertices);

		if (i % 45 == 0 || i == log) {

			this->face.addVertices(vertices);

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

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

		}
		else {

			if (line_index > 0 && i > 0) {

				this->line.addIndex(line_index - 4); this->line.addIndex(line_index + 4);
				this->line.addIndex(line_index - 3); this->line.addIndex(line_index + 5);
				this->line.addIndex(line_index - 2); this->line.addIndex(line_index + 6);
				this->line.addIndex(line_index - 1); this->line.addIndex(line_index + 7);
			}
		}
	}
}

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

	this->cam.begin();

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

	ofSetColor(239);
	ofSetLineWidth(2);
	this->face.drawWireframe();

	ofSetColor(39);
	ofSetLineWidth(1);
	this->line.draw();

	for (int i = 0; i < this->face.getNumVertices(); i++) {

		ofDrawSphere(this->face.getVertex(i), 10);
	}

	this->cam.end();
}

//--------------------------------------------------------------
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() {

ofSeedRandom(39);

this->face.clear();

this->line.clear();

auto len = 150;

auto log = 315;

auto param = 60;

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

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

int face_index = this->face.getNumVertices();

int line_index = this->line.getNumVertices();

auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(1, 0, 0));

auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(0, 1, 0));

auto rotation_z = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed.z, (ofGetFrameNum() + i) * -0.0035), 0, 1, -PI, PI), glm::vec3(0, 0, 1));

vector<glm::vec3> vertices;

vertices.push_back(glm::vec4(param, param, param, 0) * rotation_z * rotation_y * rotation_z);

vertices.push_back(glm::vec4(param, -param, -param, 0) * rotation_z * rotation_y * rotation_z);

vertices.push_back(glm::vec4(-param, param, -param, 0) * rotation_z * rotation_y * rotation_z);

vertices.push_back(glm::vec4(-param, -param, param, 0) * rotation_z * rotation_y * rotation_z);

int deg = i + ofGetFrameNum();

auto base_location = glm::vec3(

500 * cos(deg * DEG_TO_RAD),

500 * sin(deg * DEG_TO_RAD),

0);

for (auto& vertex : vertices) {

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

}

this->line.addVertices(vertices);

if (i % 45 == 0 || i == log) {

this->face.addVertices(vertices);

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

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

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

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

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

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

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

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

}

else {

if (line_index > 0 && i > 0) {

this->line.addIndex(line_index - 4); this->line.addIndex(line_index + 4);

this->line.addIndex(line_index - 3); this->line.addIndex(line_index + 5);

this->line.addIndex(line_index - 2); this->line.addIndex(line_index + 6);

this->line.addIndex(line_index - 1); this->line.addIndex(line_index + 7);

}

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

void ofApp::draw() {

this->cam.begin();

ofSetColor(39);

this->face.draw();

ofSetColor(239);

ofSetLineWidth(2);

this->face.drawWireframe();

ofSetColor(39);

ofSetLineWidth(1);

this->line.draw();

for (int i = 0; i < this->face.getNumVertices(); i++) {

ofDrawSphere(this->face.getVertex(i), 10);

}

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210509

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2021年5月8日

Overlapping. Draw by openFrameworks

[ Video ]

[ About ]
Overlapping.

[ 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);
	ofSetColor(39);
	ofSetLineWidth(3);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();

	for (int r = 10; r < 80; r += 7) {

		int v_span = 1;
		int u_span = 60;

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

			bool flag = true;
			int u_start = ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.002, 200 * sin(v * DEG_TO_RAD) * 0.002, ofGetFrameNum() * 0.005), 0, 1, -360, 360);
			int next_u = ofMap(ofNoise(200 * cos((v + v_span) * DEG_TO_RAD) * 0.002, 200 * sin((v + v_span) * DEG_TO_RAD) * 0.002, ofGetFrameNum() * 0.005), 0, 1, -360, 360);
			for (int u = u_start; u < u_start + 360; u += u_span) {

				if (flag) {

					face.addVertex(this->make_point(200, r, u, v));
					face.addVertex(this->make_point(200, r, u + u_span, v));
					face.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));
					face.addVertex(this->make_point(200, r, next_u, v + v_span));

					line.addVertex(this->make_point(200, r, u, v));
					line.addVertex(this->make_point(200, r, u + u_span, v));
					line.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));
					line.addVertex(this->make_point(200, r, next_u, v + v_span));

					ofColor color;
					color.setHsb(ofMap(r, 10, 75, 0, 255), 180, 255);

					line.addColor(color);
					line.addColor(color);
					line.addColor(color);
					line.addColor(color);

					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);

ofSetColor(39);

ofSetLineWidth(3);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

for (int r = 10; r < 80; r += 7) {

int v_span = 1;

int u_span = 60;

ofMesh face, line;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

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

bool flag = true;

int u_start = ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.002, 200 * sin(v * DEG_TO_RAD) * 0.002, ofGetFrameNum() * 0.005), 0, 1, -360, 360);

int next_u = ofMap(ofNoise(200 * cos((v + v_span) * DEG_TO_RAD) * 0.002, 200 * sin((v + v_span) * DEG_TO_RAD) * 0.002, ofGetFrameNum() * 0.005), 0, 1, -360, 360);

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

if (flag) {

face.addVertex(this->make_point(200, r, u, v));

face.addVertex(this->make_point(200, r, u + u_span, v));

face.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));

face.addVertex(this->make_point(200, r, next_u, v + v_span));

line.addVertex(this->make_point(200, r, u, v));

line.addVertex(this->make_point(200, r, u + u_span, v));

line.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));

line.addVertex(this->make_point(200, r, next_u, v + v_span));

ofColor color;

color.setHsb(ofMap(r, 10, 75, 0, 255), 180, 255);

line.addColor(color);

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/Insta20210508

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2021年5月7日2021年5月7日

写輪眼 Generator. Draw by openFrameworks

[ Video ]

[ About ]
写輪眼 Generator.

[ 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) {};
};

#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) {};

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofSetLineWidth(3);
	ofSetCircleResolution(30);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
}

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

	for (int x = 120; x <= 720 - 120; x += 120) {

		for (int y = 120; y <= 720 - 120; y += 120) {

			ofPushMatrix();
			ofTranslate(x, y);

			ofSetColor(239, 39, 39);
			ofFill();
			ofDrawCircle(glm::vec3(0, 0, -1), 54);

			auto head_size = 9;

			ofMesh mesh;
			vector<glm::vec3> right, left, frame;
			auto noise_seed_deg = ofRandom(1000);
			auto noise_seed_radius = ofRandom(1000);

			glm::vec3 last_location;
			float last_theta, last_radius;

			for (int i = 0; i < 25; i++) {

				auto noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i) * 0.005), 0, 1, -360, 360);
				auto noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i) * 0.01), 0, 1, -50, 50);
				auto next_noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i + 1) * 0.005), 0, 1, -360, 360);
				auto next_noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i + 1) * 0.01), 0, 1, -50, 50);

				auto location = glm::vec3(noise_radius * cos(noise_deg * DEG_TO_RAD), noise_radius * sin(noise_deg * DEG_TO_RAD), 0);
				auto next = glm::vec3(next_noise_radius * cos(next_noise_deg * DEG_TO_RAD), next_noise_radius * sin(next_noise_deg * DEG_TO_RAD), 0);

				auto direction = next - location;
				auto theta = atan2(direction.y, direction.x);

				right.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, head_size) * cos(theta + PI * 0.5), ofMap(i, 0, 25, 0, head_size) * sin(theta + PI * 0.5), 0));
				left.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, head_size) * cos(theta - PI * 0.5), ofMap(i, 0, 25, 0, head_size) * sin(theta - PI * 0.5), 0));

				last_location = location;
				last_theta = theta;
				last_radius = noise_radius;
			}

			for (int i = 0; i < right.size(); i++) {

				mesh.addVertex(left[i]);
				mesh.addVertex(right[i]);
			}

			for (int i = 0; i < mesh.getNumVertices() - 2; i += 2) {

				mesh.addIndex(i + 0); mesh.addIndex(i + 1); mesh.addIndex(i + 3);
				mesh.addIndex(i + 0); mesh.addIndex(i + 2); mesh.addIndex(i + 3);
			}

			auto tmp_head_size = ofMap(mesh.getNumVertices() - 2, 0, mesh.getNumVertices(), 0, head_size);

			mesh.addVertex(last_location);
			int index = mesh.getNumVertices();
			for (auto theta = last_theta - PI * 0.5; theta <= last_theta + PI * 0.5; theta += PI / 20) {

				mesh.addVertex(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));
				frame.push_back(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));
			}

			for (int i = index; i < mesh.getNumVertices() - 1; i++) {

				mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1);
			}

			int span = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.003), 0, 1, 1, 7);
			int deg_span = 360 / span;
			ofSetColor(39);
			for (int deg = 0; deg < 360; deg += 30) {

				ofRotate(deg_span);
				mesh.draw();
			}
			
			ofNoFill();
			ofDrawCircle(glm::vec3(), last_radius);
			ofDrawCircle(glm::vec3(), 55);

			ofPopMatrix();
		}
	}
}

//--------------------------------------------------------------
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);

ofSetCircleResolution(30);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

for (int x = 120; x <= 720 - 120; x += 120) {

for (int y = 120; y <= 720 - 120; y += 120) {

ofPushMatrix();

ofTranslate(x, y);

ofSetColor(239, 39, 39);

ofFill();

ofDrawCircle(glm::vec3(0, 0, -1), 54);

auto head_size = 9;

ofMesh mesh;

vector<glm::vec3> right, left, frame;

auto noise_seed_deg = ofRandom(1000);

auto noise_seed_radius = ofRandom(1000);

glm::vec3 last_location;

float last_theta, last_radius;

for (int i = 0; i < 25; i++) {

auto noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i) * 0.005), 0, 1, -360, 360);

auto noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i) * 0.01), 0, 1, -50, 50);

auto next_noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i + 1) * 0.005), 0, 1, -360, 360);

auto next_noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i + 1) * 0.01), 0, 1, -50, 50);

auto location = glm::vec3(noise_radius * cos(noise_deg * DEG_TO_RAD), noise_radius * sin(noise_deg * DEG_TO_RAD), 0);

auto next = glm::vec3(next_noise_radius * cos(next_noise_deg * DEG_TO_RAD), next_noise_radius * sin(next_noise_deg * DEG_TO_RAD), 0);

auto direction = next - location;

auto theta = atan2(direction.y, direction.x);

right.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, head_size) * cos(theta + PI * 0.5), ofMap(i, 0, 25, 0, head_size) * sin(theta + PI * 0.5), 0));

left.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, head_size) * cos(theta - PI * 0.5), ofMap(i, 0, 25, 0, head_size) * sin(theta - PI * 0.5), 0));

last_location = location;

last_theta = theta;

last_radius = noise_radius;

}

for (int i = 0; i < right.size(); i++) {

mesh.addVertex(left[i]);

mesh.addVertex(right[i]);

}

for (int i = 0; i < mesh.getNumVertices() - 2; i += 2) {

mesh.addIndex(i + 0); mesh.addIndex(i + 1); mesh.addIndex(i + 3);

mesh.addIndex(i + 0); mesh.addIndex(i + 2); mesh.addIndex(i + 3);

}

auto tmp_head_size = ofMap(mesh.getNumVertices() - 2, 0, mesh.getNumVertices(), 0, head_size);

mesh.addVertex(last_location);

int index = mesh.getNumVertices();

for (auto theta = last_theta - PI * 0.5; theta <= last_theta + PI * 0.5; theta += PI / 20) {

mesh.addVertex(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));

frame.push_back(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));

}

for (int i = index; i < mesh.getNumVertices() - 1; i++) {

mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1);

}

int span = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.003), 0, 1, 1, 7);

int deg_span = 360 / span;

ofSetColor(39);

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

ofRotate(deg_span);

mesh.draw();

}

ofNoFill();

ofDrawCircle(glm::vec3(), last_radius);

ofDrawCircle(glm::vec3(), 55);

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210507

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