vertex-array-object

I'm working through the excellent tutorials at arcsynthesis while building a graphics engine and have discovered I don't understand VAOs as much as I thought I had. From the tutorial Chapter 5. Objects In Depth Buffer Binding and Attribute Association You may notice that glBindBuffer(GL_ARRAY_BUFFER) is not on that list, even though it is part of the attribute setup for rendering. The binding to GL_ARRAY_BUFFER is not part of a VAO because the association between a buffer object and a vertex attribute does not happen when you call glBindBuffer(GL_ARRAY_BUFFER). This association happens when

I'm trying to color single vertices of quads that are drawn through glDrawElements , I'm working with cocos2d libray, so I've been able to scavenge the source code to understand exactly what is happening, code is the following: glBindVertexArray( VAOname_ ); glDrawElements(GL_TRIANGLES, (GLsizei) n*6, GL_UNSIGNED_SHORT, (GLvoid*) (start*6*sizeof(indices_[0])) ); glBindVertexArray(0); So vertex array objects are used. I'm trying to modify single vertices color of the objects that are passed and it seems to work but with a glitch which is described by the following image: Here I tried to change