Cinema Butterfly Frame (4x4 / 8x8 / 12x12) Beam-Fill Distance & Facial Wrap-Angle Solver

Deterministic Pyramidal luminaire beam-angle tangent d_fill = (W_frame/2)/tan(theta_beam/2) + solid-angle subtended wrap 2*arctan(W/(2*D_subj)) engine (.svg, .pdf, .json) built for Matthews Studio Equipment, TRP Worldwide, Avenger Grip, Chimera — zero-upload ephemeral Wasm RAM execution.

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