I'm having a really weird problem while trying to render triangles with openGL and processing, I don't know if its an issue of openGL or not but I've tried in both windows and mac with the same results.

I'm trying to render a triangle with the following vertices


The weird thing is that if I change the second vertex to 0.85065 1,0.0,-0.525731. It works.

I really don't know what is going on so if someone has any clue please help me.

Here is the actual processing code of the scene for you to play around:

1. import processing.opengl.*;
   float time = 0;
   void setup() {
     size(400, 400, OPENGL);
     //noStroke();
   }
   
   void draw() {
     resetMatrix();
     background(255);
     perspective (PI * 0.333, 1.0, 0.01, 1000.0);
     camera (0.0, -5.0, 5.0, 0.0, 0.0, -1.0, 1.0, 1.0, 0.0);
     scale (1.0, -1.0, 1.0);
     ambientLight(102, 102, 102);
     lightSpecular(204, 204, 204);
     directionalLight(102, 102, 102, -0.7, -0.7, -1);
     directionalLight(152/2, 152/2, 152/2, 0, 0, -1);
    
     pushMatrix();
   
     fill(200, 200, 200);
     ambient (200, 200, 200);
     specular(0, 0, 0);
     shininess(1.0);
    
     rotate (time, 0.0, 1.0, 0.0);
    
     beginShape();
     vertex(0.850651,0.0,0.525731);
     vertex(0.850652,0.0,-0.525731); //Try changing the 2 for a 1
     vertex(0.525731,0.850651,0.0);
     endShape(CLOSE);
   
     popMatrix();
     time += 0.05;
   }
   

EDIT: I'm actually rendering a lot of triangles but this one wasn't showing so I looked for the vertices and it didn't showed up alone either.