Example of Hα synthesis code. Based on the magnetic field model from D. H. Mackay & A. A. van Ballegooijen (2009), we employed a pseudo-3D code to simulate and reconstruct the density and temperature distributions of cool filament threads. These were subsequently incorporated into the Hα calculation module of the RST for synthesis. Panels (a) and (b) display the number density and temperature distributions of the filament threads from a top-view perspective, respectively, while panel (c) presents the synthesized image at the Hα line center.