ofMesh::icosahedron doesn't draw correctly

@cuinjune wrote:

Hi, I just found out ofMesh::icosahedron doesn't draw correctly.
Every other 3d mesh objects work correctly but not this one.
I think it has problems with its normals.

Screen Shot 2017-03-29 at 3.19.43 PM.png2044x1586 175 KB

Here's my code below.

in ofApp.h

ofLight light;
ofMaterial material;
ofMesh sphere;
ofMesh icosphere;
ofMesh icosahedron;
float degree;

in ofApp.cpp

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

    ofSetBackgroundColor(10, 10, 10);
    ofEnableDepthTest();

    //directional light
    light.setDirectional();
    light.setSpecularColor(ofColor(255));
    light.setDiffuseColor(ofColor(255));
    light.setAmbientColor(ofColor(100));
    light.setOrientation(ofVec3f(0,180,0));

    //material
    material.setShininess(120);
    material.setSpecularColor(ofColor(0));
    material.setDiffuseColor(ofColor(200));
    material.setAmbientColor(ofColor(0));

    //mesh
    sphere = ofMesh::sphere(100);
    icosphere = ofMesh::icosphere(100);
    icosahedron = ofMesh::icosahedron(100);
}

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

    degree++;
}

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

    ofEnableLighting();
    light.enable();
    material.begin();

    //draw sphere
    ofPushMatrix();
    ofTranslate(ofGetWidth()*0.2, ofGetHeight()*0.5);
    ofDrawBitmapString("SPHERE", -35, -130);
    ofRotate(degree, 1, 1, 1);
    sphere.draw();
    ofPopMatrix();

    //draw icosphere
    ofPushMatrix();
    ofTranslate(ofGetWidth()*0.5, ofGetHeight()*0.5);
    ofDrawBitmapString("ICOSPHERE", -40, -130);
    ofRotate(degree, 1, 1, 1);
    icosphere.draw();
    ofPopMatrix();

    //draw icosahedron
    ofPushMatrix();
    ofTranslate(ofGetWidth()*0.8, ofGetHeight()*0.5);
    ofDrawBitmapString("ICOSAHEDRON", -40, -130);
    ofRotate(degree, 1, 1, 1);
    icosahedron.draw();
    ofPopMatrix();

    material.end();
    light.disable();
    ofDisableLighting()
}

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