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L=height-rail_clearance*2, th=right_rib_thickness); // top right [left_edge + height * rotate_vector_cos, rotate_vector_sin * height + rotate_vector_sin * height], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * rail_depth] // top horizontal rib .

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