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I'm having an issue rendering in OpenGL ES 1.1 for an iPhone game that I'm building. In short, I am rendering 3 items: Background (works fine) A number of spherical objects (works fine) A simple line circle that changes size (I am getting a problem here). Basically, I am getting an EXC_BAD_ACCESS error when I call drawArrays on the circle. I have tested the code in the basic iPhone OpenGL template and it works just fine, so I can't really track why it's not working here. Can someone point me in the right way? Here is the drawCircle code used to render the circle. - (void) drawCircles { if (!m_circleEffects.empty()) { int segments = 24; for (int i = 0; i < m_circleEffects.size(); i++) { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(m_circleEffects[i].position.x, m_circleEffects[i].position.y, 0); float radius; if(m_circleEffects[i].isPulseOutward) radius = cos(m_circleEffects[i].frameCounter * M_PI / 720); else radius = sin(m_circleEffects[i].frameCounter * M_PI / 720); GLfloat circlePoints[segments * 3]; int count = 0; for (GLfloat i = 0; i < 360.0f; i += (360.0f / segments)) { circlePoints[count++] = (cos(i * M_PI / 180) * radius); circlePoints[count++] = (sin(i * M_PI / 180) * radius); circlePoints[count++] = z + 1; } glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(3, GL_FLOAT, 0, circlePoints); glDrawArrays(GL_LINE_LOOP, 0, segments); glDisableClientState(GL_VERTEX_ARRAY); } m_circleEffects.clear(); } } And the following is my other rendering code. It is called prior to the above code in the run loop. Everything in the following seems to work OK. - (void)passInVisualsToU

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