It doesn’t work on my samsung galaxy s3 :/ it only shows a black screen.
Do you what the problem is?

The key here is that the triangle coordinates get multiplied by the view matrix before the projection matrix, and the view matrix moves the triangles into the right range. It might be easier to understand it if you debug your program, copy the actual values into a calculator, like this one: http://www.calcul.com/show/calculator/matrix-multiplication

Enter the values like this

0 4 8 12
1 5 9 13
2 6 10 14
3 7 11 15

With the number corresponding to that position in the array. Then you can multiply the matrices, or matrix * vector, just as you see it in the code, and also compare the results to what you see in the code.

I am a newbie and please forgive me for asking this simplistic question, it’s stuck in my head.
The triangles have been defined to be in the xy plane with z = 0.0
And the near and far clipping planes are z = 1.0 and z = 10.0 respectively. So the triangles lie outside the view frustum, right? I do not understand how they are visible. What makes me even more curious is that the triangles vanish when I set their z coordinates to 1.0, which should be included in the view frustum. I searched and searched on Google but I could not find the answer or the correct keywords to use. Somebody please answer, or this curiosity will kill me.

Sorry if i already should have known but it said for beginners, and im starting here from scratch into openGL es.

Can you create an explosion style particle effect? PLEASE :). Currently I am reading your book but the particle system there is like a fountain

Please.

Thanks