<p>My triangles are all messed up. Then the mistake boiled down to this piece of code

<pre><code>
//6. bottom-triangles
//b1, b4, f3
1,-1,1,		-1,-1,1		-1,-1,0,
//b1, f3, f4
1,-1,1,		-1,-1,0,	1,-1,0
</code></pre>

<p>Compiler is fine. Just my triangle! Can you spot the mistake! it is a fun mistake.