i'm new to OpenGL and try to learn some basics as described on http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-table-of.html. But it doesn't work, so I have some questions.
- Where and how I should modify the ImageTargets example to draw a permanent visible triangle in the middle of a screen as described in this tutorial: http://iphonedevelopment.blogspot.com/2009/04/opengl-es-from-ground-up-part-2-look-at.html.
- How to move the triangle to the middle of a recognized image target?
- How to replace the triangle with a texture like green_glow.png or blue_glow.png from dominoes example?