WebGL got weird drawing(loop not closed) with gl.TRIANGLES

Question

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. question from:https://stackoverflow.com/questions/65545848/webgl-got-weird-drawingloop-not-closed-with-gl-triangles

Answer 1

You have 3 places in your vertex data were you have 0,0 instead of 0.0

 var triangleVertices = [      


        ...

         /*triangle*/
        -0.2, -0.6, 0.0,
        -0.7, -0.5, 0.0,
        -0.6, -0.6, 0,0,   // <==---    
         /*triangle*/
        -0.7, -0.5, 0.0,
        -0.6, -0.6, 0,0,   // <==--- 
        -0.7, -1.0, 0.0,
         /*triangle*/
        -0.6, -0.6, 0,0,   // <==---
        -0.7, -1.0, 0.0,
        -0.6, -0.9, 0.0,
  ];