Puerta de Alcalá in Madrid, neoclassical triumphal
gate by Francesco Sabatini (1778) for King Charles III, with sculptural groups
by Robert Michel and Francisco Gutiérrez. Modeled at real-world scale in
meters, calibrated against the official municipal photogrammetry (used only as
a measuring reference): 43.07 m wide, 11.74 m deep, about 23.8 m high.


Five openings (three round arches, the central one taller, plus two lintelled
side passages), ten smooth-shaft Ionic half-columns on pedestals with moulded
bases and Ionic capitals, arch archivolts with keystones, entablature with
cornice, attic over the three arches with the inscription "REGE CAROLO III
/ ANNO / MDCCLXXVIII" in bronze letters, broken semicircular pediment with
lead roof, trophies and cartouches, and stylized sculptural groups crowning the
wings. Both facades modeled (east with columns, west with pilasters).


- Geometry: 65,346 triangles, 39,453 vertices, 4 objects by material
(PA_Granito, PA_Caliza, PA_Plomo, PA_Bronce). Closed, clean geometry;
sculptures are stylized (not a scan).

- UVs: one non-overlapping 0-1 UV channel per object.

- Materials: 4 PBR materials (metal/roughness): Granito_Segovia,
Caliza_Colmenar, Plomo_cubierta, Bronce_letras. Baked textures BaseColor,
Roughness, Normal: 4K for granite and limestone, 2K lead, 1K bronze.

- Units: meters, Z up, origin at the center of the gate, ground level near Z =
0.
-
Formats: FBX, OBJ + MTL, GLB, BLEND (Blender 5.2). Textures in /textures
with relative paths.

- Rendered in Blender Cycles. No plugins required.


Public domain architecture and sculpture (Sabatini died 1797). Reference scan
CC BY by Ayuntamiento de Madrid (memoriademadrid), used only to measure; no
mesh or texture from it is included.