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RGB mask.
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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) {}; ofImage image; ofFbo fbo; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetColor(255); ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER); this->image.loadImage("images/lenna.png"); this->image.resize(720, 720); this->fbo.allocate(720, 720); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); this->fbo.begin(); ofClear(0); ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD); ofTranslate(this->fbo.getWidth() * 0.5, this->fbo.getHeight() * 0.5); for (int k = 0; k < 3; k++) { switch (k % 3) { case 0: ofSetColor(255, 255, 0); break; case 1: ofSetColor(0, 255, 255); break; case 2: ofSetColor(255, 0, 255); break; } auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000)); ofMesh mesh; vector<glm::vec3> right, left; glm::vec3 last_location; float last_theta; int len = 100; int head_size = 45; for (int i = 0; i < len; i++) { auto location = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), 0); auto next = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), 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]); } 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(len - 2, 0, len, 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)); } for (int i = index; i < mesh.getNumVertices() - 1; i++) { mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1); } mesh.draw(); } ofDisableBlendMode(); this->fbo.end(); this->image.getTextureReference().setAlphaMask(this->fbo.getTexture()); this->image.update(); } //-------------------------------------------------------------- void ofApp::draw() { ofSetColor(255); this->image.draw(ofGetWindowSize() * 0.5); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |
[ Link ]
https://github.com/junkiyoshi/Insta20210616
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