Contour Output Shaders

Output shaders are called after the image has been computed. An output shader can use the function mi_get_contour_line to get endpoints of a contour. When mi_get_contour_line returns miFALSE, there are no more contour lines.

Here is a very simple output shader that prints the screen-space coordinates of the contour endpoints.

miBoolean my_contour_output_shader(
    miColor  *result,   /* unused */
    miState  *state)
    /* no parameters */
    miContour_endpoint p1;
    miContour_endpoint p2;

    mi_info("Contour endpoints:");

    /* Get and write the contour endpoints */
    while (mi_get_contour_line(&p1, &p2))
            mi_info("%f %f --- %f %f", p1.point.x, p1.point.y,
                                       p2.point.x, p2.point.y);

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