ofMesh – ページ 165 – プログラミング de 落描き

2020年10月1日2020年10月1日

Afterimage. Draw by openFrameworks

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残像。

Afterimage.

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#pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	void setRingToMesh(ofMesh& face_target, glm::vec3 location, float radius, int deg_start, int deg_end);

	ofEasyCam cam;
	ofMesh face;
};

#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) {};

void setRingToMesh(ofMesh& face_target, glm::vec3 location, float radius, int deg_start, int deg_end);

ofEasyCam cam;

ofMesh face;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);

	this->face.clear();
	for (int radius = 50; radius <= 250; radius += 50) {
	
		this->setRingToMesh(this->face, glm::vec3(), radius, 0, 360);
	}
}

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

	this->cam.begin();

	this->face.draw();

	this->cam.end();
}

//--------------------------------------------------------------
void ofApp::setRingToMesh(ofMesh& face_target, glm::vec3 location, float radius, int deg_start, int deg_end) {

	
	auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));
	int deg_span = 1;
	for (int i = 0; i < 15; i++) {

		auto angle_x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.005 + i * 0.003), 0, 1, -PI, PI);
		auto rotation_x = glm::rotate(glm::mat4(), angle_x, glm::vec3(1, 0, 0));

		auto angle_y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.005 + i * 0.003), 0, 1, -PI, PI);
		auto rotation_y = glm::rotate(glm::mat4(), angle_y, glm::vec3(0, 1, 0));

		auto next_angle_x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.005 + (i + 1) * 0.003), 0, 1, -PI, PI);
		auto next_rotation_x = glm::rotate(glm::mat4(), next_angle_x, glm::vec3(1, 0, 0));

		auto next_angle_y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.005 + (i + 1) * 0.003), 0, 1, -PI, PI);
		auto next_rotation_y = glm::rotate(glm::mat4(), next_angle_y, glm::vec3(0, 1, 0));


		for (int deg = deg_start; deg < deg_end; deg += deg_span) {

			auto face_index = face_target.getNumVertices();

			vector<glm::vec3> vertices;
			vertices.push_back(location + glm::vec4(radius * cos(deg * DEG_TO_RAD) , radius * sin(deg * DEG_TO_RAD), 0, 0) * rotation_y * rotation_x);
			vertices.push_back(location + glm::vec4(radius * cos((deg + deg_span) * DEG_TO_RAD), radius * sin((deg + deg_span) * DEG_TO_RAD), 0, 0) * rotation_y * rotation_x);
			
			vertices.push_back(location + glm::vec4(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), 0, 0) * next_rotation_y * next_rotation_x);
			vertices.push_back(location + glm::vec4(radius * cos((deg + deg_span) * DEG_TO_RAD), radius * sin((deg + deg_span) * DEG_TO_RAD), 0, 0) * next_rotation_y * next_rotation_x);

			face_target.addVertices(vertices);

			face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 2);
			face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 2);

			face_target.addColor(ofColor(39, ofMap(i, 0, 15, 128, 255)));
			face_target.addColor(ofColor(39, ofMap(i, 0, 15, 128, 255)));
			face_target.addColor(ofColor(39, ofMap(i + 1, 0, 15, 128, 255)));
			face_target.addColor(ofColor(39, ofMap(i + 1, 0, 15, 128, 255)));
			
		}
	}
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

for (int radius = 50; radius <= 250; radius += 50) {

this->setRingToMesh(this->face, glm::vec3(), radius, 0, 360);

}

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

void ofApp::draw() {

this->cam.begin();

this->face.draw();

this->cam.end();

}

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

void ofApp::setRingToMesh(ofMesh& face_target, glm::vec3 location, float radius, int deg_start, int deg_end) {

auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));

int deg_span = 1;

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

auto angle_x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.005 + i * 0.003), 0, 1, -PI, PI);

auto rotation_x = glm::rotate(glm::mat4(), angle_x, glm::vec3(1, 0, 0));

auto angle_y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.005 + i * 0.003), 0, 1, -PI, PI);

auto rotation_y = glm::rotate(glm::mat4(), angle_y, glm::vec3(0, 1, 0));

auto next_angle_x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.005 + (i + 1) * 0.003), 0, 1, -PI, PI);

auto next_rotation_x = glm::rotate(glm::mat4(), next_angle_x, glm::vec3(1, 0, 0));

auto next_angle_y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.005 + (i + 1) * 0.003), 0, 1, -PI, PI);

auto next_rotation_y = glm::rotate(glm::mat4(), next_angle_y, glm::vec3(0, 1, 0));

for (int deg = deg_start; deg < deg_end; deg += deg_span) {

auto face_index = face_target.getNumVertices();

vector<glm::vec3> vertices;

vertices.push_back(location + glm::vec4(radius * cos(deg * DEG_TO_RAD) , radius * sin(deg * DEG_TO_RAD), 0, 0) * rotation_y * rotation_x);

vertices.push_back(location + glm::vec4(radius * cos((deg + deg_span) * DEG_TO_RAD), radius * sin((deg + deg_span) * DEG_TO_RAD), 0, 0) * rotation_y * rotation_x);

vertices.push_back(location + glm::vec4(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), 0, 0) * next_rotation_y * next_rotation_x);

vertices.push_back(location + glm::vec4(radius * cos((deg + deg_span) * DEG_TO_RAD), radius * sin((deg + deg_span) * DEG_TO_RAD), 0, 0) * next_rotation_y * next_rotation_x);

face_target.addVertices(vertices);

face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 2);

face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 2);

face_target.addColor(ofColor(39, ofMap(i, 0, 15, 128, 255)));

face_target.addColor(ofColor(39, ofMap(i + 1, 0, 15, 128, 255)));

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20201001

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2020年9月30日2020年9月30日

usuzumi satelliters. Draw by openFrameworks

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[ About ]
usuzumi satelliters.

[ 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(2);
}

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

	ofSeedRandom(39);
}

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

	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

	int number_of_satellite = 4;
	int number_of_log = 50;
	int location_radius = 230;
	ofColor color(39);

	for (int param = 0; param < 360; param += 120) {

		auto base_location = glm::vec3(location_radius * cos((ofGetFrameNum() + param + number_of_log) * DEG_TO_RAD), location_radius * sin((ofGetFrameNum() + param + number_of_log) * DEG_TO_RAD), 0);
		auto base_radius = 50;

		ofFill();
		ofSetColor(color);
		ofDrawSphere(base_location, base_radius * 0.25);

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

			float noise_seed_x = ofRandom(1000);
			float noise_seed_y = ofRandom(1000);
			auto location = glm::vec3(ofRandom(-1, 1), ofRandom(-1, 1), ofRandom(-1, 1));
			location = glm::normalize(location) * base_radius * 1.5;
			vector<glm::vec3> log_list;
			for (int k = 0; k < number_of_log; k++) {

				auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed_y, (ofGetFrameNum() + k) * 0.005), 0, 1, -PI * 2, PI * 2), glm::vec3(0, 1, 0));
				auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed_x, (ofGetFrameNum() + k) * 0.005), 0, 1, -PI * 2, PI * 2), glm::vec3(1, 0, 0));
				auto tmp_base_location = glm::vec3(location_radius * cos((ofGetFrameNum() + param + k) * DEG_TO_RAD), location_radius * sin((ofGetFrameNum() + param + k) * DEG_TO_RAD), 0);
				auto log_location = tmp_base_location + glm::vec4(location, 0) * rotation_y * rotation_x;
				log_list.push_back(log_location);
			}

			auto head_size = 8;
			ofMesh mesh;
			vector<glm::vec3> right, left;
			glm::vec3 last_location;
			float last_theta;

			for (int k = 0; k < log_list.size() - 1; k++) {

				auto location = log_list[k];
				auto next = log_list[k + 1];

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

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

				last_location = location;
				last_theta = theta;
			}

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

				mesh.addVertex(left[k]);
				mesh.addVertex(right[k]);

				mesh.addColor(ofColor(color, ofMap(k, 0, log_list.size(), 0, 255)));
				mesh.addColor(ofColor(color, ofMap(k, 0, log_list.size(), 0, 255)));
			}

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

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

			mesh.addVertex(last_location);
			mesh.addColor(ofColor(color));
			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(head_size * cos(theta), head_size * sin(theta), 0));
				mesh.addColor(ofColor(color));
			}

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

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

			mesh.draw();
		}
	}
}

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

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

int number_of_satellite = 4;

int number_of_log = 50;

int location_radius = 230;

ofColor color(39);

for (int param = 0; param < 360; param += 120) {

auto base_location = glm::vec3(location_radius * cos((ofGetFrameNum() + param + number_of_log) * DEG_TO_RAD), location_radius * sin((ofGetFrameNum() + param + number_of_log) * DEG_TO_RAD), 0);

auto base_radius = 50;

ofFill();

ofSetColor(color);

ofDrawSphere(base_location, base_radius * 0.25);

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

float noise_seed_x = ofRandom(1000);

float noise_seed_y = ofRandom(1000);

auto location = glm::vec3(ofRandom(-1, 1), ofRandom(-1, 1), ofRandom(-1, 1));

location = glm::normalize(location) * base_radius * 1.5;

vector<glm::vec3> log_list;

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

auto rotation_y = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed_y, (ofGetFrameNum() + k) * 0.005), 0, 1, -PI * 2, PI * 2), glm::vec3(0, 1, 0));

auto rotation_x = glm::rotate(glm::mat4(), ofMap(ofNoise(noise_seed_x, (ofGetFrameNum() + k) * 0.005), 0, 1, -PI * 2, PI * 2), glm::vec3(1, 0, 0));

auto tmp_base_location = glm::vec3(location_radius * cos((ofGetFrameNum() + param + k) * DEG_TO_RAD), location_radius * sin((ofGetFrameNum() + param + k) * DEG_TO_RAD), 0);

auto log_location = tmp_base_location + glm::vec4(location, 0) * rotation_y * rotation_x;

log_list.push_back(log_location);

}

auto head_size = 8;

ofMesh mesh;

vector<glm::vec3> right, left;

glm::vec3 last_location;

float last_theta;

for (int k = 0; k < log_list.size() - 1; k++) {

auto location = log_list[k];

auto next = log_list[k + 1];

auto direction = next - location;

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

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

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

last_location = location;

last_theta = theta;

}

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

mesh.addVertex(left[k]);

mesh.addVertex(right[k]);

mesh.addColor(ofColor(color, ofMap(k, 0, log_list.size(), 0, 255)));

}

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

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

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

}

mesh.addVertex(last_location);

mesh.addColor(ofColor(color));

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(head_size * cos(theta), head_size * sin(theta), 0));

mesh.addColor(ofColor(color));

}

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

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

}

mesh.draw();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200930

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Amazon

[ Sponsor Link ]

2020年9月29日2020年9月29日

usuzumi random walk. Draw by openframeworks

[ Video ]

[ About ]
usuzumi random walk.

[ 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(2);
}

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

	ofSeedRandom(39);
}

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

	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

	for (int k = 0; k < 2; k++) {

		auto head_size = 10;

		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;

		int len = 80;
		for (int i = 0; i < len; i++) {

			auto noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i) * 0.001), 0, 1, -360, 360);
			auto noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i) * 0.01), 0, 1, -360, 360);
			auto next_noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i + 1) * 0.001), 0, 1, -360, 360);
			auto next_noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i + 1) * 0.01), 0, 1, -360, 360);

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

			last_location = location;
			last_theta = theta;
		}

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

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

			mesh.addColor(ofColor(39, ofMap(i, 0, len, 0, 255)));
			mesh.addColor(ofColor(39, ofMap(i, 0, len, 0, 255)));
		}

		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);
		}

		mesh.addVertex(last_location);
		mesh.addColor(ofColor(39));
		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(head_size * cos(theta), head_size * sin(theta), 0));
			mesh.addColor(ofColor(39));
			frame.push_back(last_location + glm::vec3(head_size * cos(theta), 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 deg_span = 60;
		for (int deg = 0; deg < 360; deg += deg_span) {

			ofRotate(deg_span);

			mesh.draw();
		}
	}
}

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

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

for (int k = 0; k < 2; k++) {

auto head_size = 10;

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;

int len = 80;

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

auto noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i) * 0.001), 0, 1, -360, 360);

auto noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i) * 0.01), 0, 1, -360, 360);

auto next_noise_deg = ofMap(ofNoise(noise_seed_deg, (ofGetFrameNum() + i + 1) * 0.001), 0, 1, -360, 360);

auto next_noise_radius = ofMap(ofNoise(noise_seed_radius, (ofGetFrameNum() + i + 1) * 0.01), 0, 1, -360, 360);

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, len, 0, head_size) * cos(theta + PI * 0.5), ofMap(i, 0, len, 0, head_size) * sin(theta + PI * 0.5), 0));

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

last_location = location;

last_theta = theta;

}

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

mesh.addVertex(left[i]);

mesh.addVertex(right[i]);

mesh.addColor(ofColor(39, ofMap(i, 0, len, 0, 255)));

}

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);

}

mesh.addVertex(last_location);

mesh.addColor(ofColor(39));

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(head_size * cos(theta), head_size * sin(theta), 0));

mesh.addColor(ofColor(39));

frame.push_back(last_location + glm::vec3(head_size * cos(theta), 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 deg_span = 60;

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

ofRotate(deg_span);

mesh.draw();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200929

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