Psychtoolbox OpenGL - draw a line

Question

I need is a single line rendered from within PsychToolBox in Matlab. So:

glBegin(GL.LINES);
glVertex3f(0, 0, 0);
glVertex3f(1, 1, 1);
glEnd;

Returns:

??? The class "GL" is undefined. Perhaps Java is not running.

I'm using the code provided here.

However, I substituted GL_LINES with GL.LINES to fit psychtoolbox convention (naturally, tried it both ways).

Answer 1

I had a similar issue when I added a subfunction that was fixed by making GL a global variable:

function parent()
    global GL
    InitializeMatlabOpenGL(0);
    ...
    function child()
        ...
    end
end