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March 4, 2016 06:45
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oF で半球を描く ref: http://qiita.com/hideyukisaito/items/692b7f13388f09e549d9
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ofVbo mHemisphere; | |
void ofApp::setup() | |
{ | |
const auto resolution_ = 256; | |
const auto radius_ = 100.0; | |
std::vector<ofVec3f> vertices_; | |
for (auto i = 0; i < resolution_; ++i) | |
{ | |
for (auto j = 0; j < resolution_; ++j) | |
{ | |
vertices_.emplace_back(ofVec3f( | |
radius_ * std::cos(j * 2 * M_PI / resolution_) * std::cos(i * M_PI / (2 * resolution_)), | |
radius_ * std::sin(-i * M_PI / (2 * resolution_)), | |
radius_ * std::sin(j * 2 * M_PI / resolution_) * std::cos(i * M_PI / (2 * resolution_)) | |
)); | |
} | |
} | |
ofMesh mesh_; | |
for (auto i = 0; i < resolution_ - 1; ++i) | |
{ | |
for (auto j = 0; j < resolution_; ++j) | |
{ | |
mesh_.addVertex(vertices_.at(i * resolution_ + j)); | |
mesh_.addVertex(vertices_.at(i * resolution_ + (j + 1) % resolution_)); | |
mesh_.addVertex(vertices_.at((i + 1) * resolution_ + (j + 1) % resolution_)); | |
mesh_.addVertex(vertices_.at((i + 1) * resolution_ + j)); | |
} | |
} | |
mHemisphere.setMesh(std::move(mesh_), GL_STATIC_DRAW); | |
} | |
void ofApp::draw() | |
{ | |
ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); | |
ofRotate(ofGetElapsedTimef() * 30.0, 1.0, 0.0, 1.0); | |
mHemisphere.draw(GL_QUADS, 0, mVbo.getNumVertices()); | |
} |
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