How to properly draw custom 3d objects using ofPath

@cuinjune wrote:

Hi, I'm trying to test if it's possible to draw any 3d shape I want using ofPath so I can later use it as a ofPolyline or ofMesh.

First, I'm trying to draw a simple pyramid-like shape made of 4 isosceles triangles. (without the bottom square)

Here's the test code I wrote,

void ofApp::draw(){

ofTranslate(ofGetWidth()/2, ofGetHeight()/2);
ofRotate(60, 1, 1, 1);

ofPath path;
path.clear();

//upper triangle (as if seeing the pyramid from the sky)
path.moveTo(-50, -50, 0);
path.lineTo(0, 0, 150);
path.lineTo(50, -50, 0);
path.close();

//left triangle
path.moveTo(-50, -50, 0);
path.lineTo(0, 0, 150);
path.lineTo(-50, 50, 0);
path.close();

//right triangle
path.moveTo(50, -50, 0);
path.lineTo(0, 0, 150);
path.lineTo(50, 50, 0);
path.close();

//lower triangle
path.moveTo(-50, 50, 0);
path.lineTo(0, 0, 150);
path.lineTo(50, 50, 0);
path.close();

path.draw();

}

And unfortunately, this draws nothing.
But if I set the path unfilled by adding the two lines below after path.clear();
path.setFilled(false);
path.setStrokeWidth(2);

Then it shows a stroke of the shape properly as the image below.

But I don't know why it doesn't draw anything when I try to fill the shape.
Does this have to do with overlapping lines between triangles? do they cancel the path?
Or should I make 4 different paths that draw separately? (I'm sure this will work at least)

I want to know if it is possible to properly draw any 3d shape using just one ofPath.
Thank you very much in advance!

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