I am trying to do a highlighting action on the iPhone. I can draw lines an such with the finger but now I want to be able to highlight over that. Any algorithms out there you can point me to that does that? Using OpenGL ES off course.
Thanks
This should produce a pink highlight around your geometry:
render_model();
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
glColor3f(1.0f, 0.0f, 1.0f);
glLineWidth(2);
glCullFace(GL_FRONT);
render_model_using_GL_LINES();
glCullFace(GL_BACK);
glEnable(GL_TEXTURE_2D);
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