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Warpfield (Winds And Radiation Pressure: Feedback Induced Expansion, colLapse and Dissolution) calculates shell dynamics and shell structure simultaneously for isolated massive clouds (≥105 M☉). This semi-analytic 1D feedback model scans a large range of physical parameters (gas density, star formation efficiency, and metallicity) to estimate escape fractions of ionizing radiation fesc, I, the minimum star formation efficiency ∊min required to drive an outflow, and recollapse time-scales for clouds that are not destroyed by feedback.