lighting: fixed daytime rig, real surface materials, crossing fix
Fixed daytime lighting and basic ambience for the DemoMap: - Sun pitch -50 / yaw 120 (intensity 4, warm), sky light 2.6 with real-time capture, sky atmosphere, height fog, and an unbound post-process volume with fixed exposure (min = max brightness) so no shot washes out or crushes to black depending on how much sky it frames. - Root cause of the washed-out look was NOT the sun: Blender's flat diffuse colours do not survive the FBX->Unreal import. Every site material arrived white and the terrain arrived with WorldGridMaterial. The demo builder now creates and assigns M_Asphalt / M_Concrete / M_Ground / M_RoadPaint. - Crossing fix: each zebra band was its own object, so Blender renamed the duplicates .001/.002 and site assembly (exact-name append) kept only one. All bands are now a single Crossing_Markings mesh (36 verts, 3 bands). - Terrain gets a Ground_Earth material in the builder so it stops importing as a white grid. - Demo cameras: street-level no longer sits inside the facade body (was rendering its back face), and the crossing camera aims at the designated s=130.1 crossing (UE X -14956) looking along the crosswalk. Screenshots re-rendered; the four demo views are marked needs-review for the owner's approval. MEMORY.md records the material-import, exposure, light_color, band-naming and camera-bounds traps.
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@@ -50,6 +50,29 @@ def spawn(cls, loc, label, rot=None):
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return actor
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def ensure_material(asset_name, rgb):
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"""Create/reuse a flat-colour material under /Game/Hollywood/Site.
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Used where the FBX material round-trip does not survive import: the terrain
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arrives with WorldGridMaterial (UE's bright default grid), which reads as a
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blown-out white field under the demo sun.
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"""
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path = f"/Game/Hollywood/Site/{asset_name}"
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if unreal.EditorAssetLibrary.does_asset_exist(path):
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return unreal.EditorAssetLibrary.load_asset(path)
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mat = unreal.AssetToolsHelpers.get_asset_tools().create_asset(
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asset_name, "/Game/Hollywood/Site", unreal.Material, unreal.MaterialFactoryNew())
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node = unreal.MaterialEditingLibrary.create_material_expression(
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mat, unreal.MaterialExpressionConstant3Vector)
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node.set_editor_property("constant", unreal.LinearColor(rgb[0], rgb[1], rgb[2], 1.0))
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unreal.MaterialEditingLibrary.connect_material_property(
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node, "", unreal.MaterialProperty.MP_BASE_COLOR)
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unreal.MaterialEditingLibrary.recompile_material(mat)
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unreal.EditorAssetLibrary.save_loaded_asset(mat)
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log(f"created material {asset_name} rgb={rgb}")
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return mat
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def clear(prefixes=()):
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removed = 0
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for actor in unreal.EditorLevelLibrary.get_all_level_actors():
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@@ -74,12 +97,87 @@ def build():
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removed = clear(("Demo_", "PlayerStart", "Hero_Facade"))
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log(f"cleared {removed} previous demo actors")
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# --- lighting ---------------------------------------------------------
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spawn(unreal.DirectionalLight, unreal.Vector(0, 0, 2000), "Demo_Sun",
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unreal.Rotator(pitch=-35.0, yaw=200.0, roll=0.0))
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spawn(unreal.SkyLight, unreal.Vector(0, 0, 2000), "Demo_SkyLight")
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# --- lighting: fixed daytime ------------------------------------------
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# The demo is a fixed daytime scene, not a time-of-day simulation. Three
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# things matter and each was wrong before:
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#
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# 1. Sun angle. The hero facade front faces -Y and the road faces +Z. A sun
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# at yaw 120 / pitch -50 shines toward (-X, +Y, down), so it lights both
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# the facade front and the carriageway instead of raking across them.
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# 2. Exposure. Auto-exposure made the same road washed-out in one shot and
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# near-black in the next, because each camera framed a different amount
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# of sky. A manual-exposure post-process volume pins it.
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# 3. Ambience. A height fog gives the street depth and hides the terrain
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# edge that otherwise reads as a black band at the horizon.
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sun = spawn(unreal.DirectionalLight, unreal.Vector(0, 0, 2000), "Demo_Sun",
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unreal.Rotator(pitch=-50.0, yaw=120.0, roll=0.0))
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if sun:
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comp = sun.get_component_by_class(unreal.DirectionalLightComponent)
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if comp:
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for prop, value in (
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("intensity", 4.0),
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("light_color", unreal.Color(r=255, g=245, b=230, a=255)),
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("atmosphere_sun_light", True),
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):
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try:
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comp.set_editor_property(prop, value)
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except Exception as exc: # noqa: BLE001
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log(f"sun.{prop} not set: {exc!r}")
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log("staged: Demo_Sun (pitch -50, yaw 120, intensity 4, warm)")
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sky = spawn(unreal.SkyLight, unreal.Vector(0, 0, 2000), "Demo_SkyLight")
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if sky:
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comp = sky.get_component_by_class(unreal.SkyLightComponent)
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if comp:
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for prop, value in (("intensity", 2.6), ("real_time_capture", True)):
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try:
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comp.set_editor_property(prop, value)
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except Exception as exc: # noqa: BLE001
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log(f"sky.{prop} not set: {exc!r}")
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log("staged: Demo_SkyLight (intensity 2.6, real-time capture)")
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spawn(unreal.SkyAtmosphere, unreal.Vector(0, 0, 0), "Demo_Sky")
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log("staged: sun, sky light, sky atmosphere")
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log("staged: Demo_Sky (sky atmosphere)")
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fog = spawn(unreal.ExponentialHeightFog, unreal.Vector(0, 0, 0), "Demo_Fog")
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if fog:
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comp = fog.get_component_by_class(unreal.ExponentialHeightFogComponent)
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if comp:
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for prop, value in (
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("fog_density", 0.008),
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("fog_height_falloff", 0.15),
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("start_distance", 3000.0),
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):
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try:
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comp.set_editor_property(prop, value)
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except Exception as exc: # noqa: BLE001
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log(f"fog.{prop} not set: {exc!r}")
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log("staged: Demo_Fog (height fog, density 0.008)")
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# Fixed exposure: without this the same road renders washed out or black
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# depending on how much sky the camera frames. Pinning min == max brightness
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# freezes the exposure at one value (the classic fixed-exposure trick);
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# AEM_MANUAL with a bias was tried first and blew the frame out.
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ppv = spawn(unreal.PostProcessVolume, unreal.Vector(0, 0, 0), "Demo_PostProcess")
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if ppv:
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ppv.set_editor_property("unbound", True)
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settings = ppv.get_editor_property("settings")
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for prop, value in (
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("override_auto_exposure_method", True),
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("auto_exposure_method", unreal.AutoExposureMethod.AEM_HISTOGRAM),
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("override_auto_exposure_min_brightness", True),
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("auto_exposure_min_brightness", 1.0),
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("override_auto_exposure_max_brightness", True),
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("auto_exposure_max_brightness", 1.0),
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("override_auto_exposure_bias", True),
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("auto_exposure_bias", 0.0),
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):
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try:
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settings.set_editor_property(prop, value)
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except Exception as exc: # noqa: BLE001
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log(f"pp.{prop} not set: {exc!r}")
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ppv.set_editor_property("settings", settings)
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log("staged: Demo_PostProcess (fixed exposure, min=max brightness 1.0)")
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# --- hero facade on the measured building line ------------------------
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hero = unreal.EditorAssetLibrary.load_asset("/Game/Hollywood/ElCapitan/SM_HeroFacade")
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@@ -93,9 +191,21 @@ def build():
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log("MISSING: SM_HeroFacade — run Tools/ue_hero_facade_import.py")
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# --- site meshes, if they have been imported --------------------------
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# Blender's flat diffuse colours do not survive FBX -> Unreal: Interchange
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# builds a material with a default white base colour, and the terrain even
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# lands with WorldGridMaterial. Every site surface therefore rendered white,
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# which is what washed out the demo. Assign explicit colours per mesh here.
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SURFACE_MATERIALS = {
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"Terrain_DEM": ("M_Ground", (0.30, 0.28, 0.25)),
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"Road_Hollywood": ("M_Asphalt", (0.055, 0.055, 0.06)),
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"Sidewalk_South": ("M_Concrete", (0.52, 0.50, 0.47)),
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"Sidewalk_North": ("M_Concrete", (0.52, 0.50, 0.47)),
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"Kerb_South": ("M_Concrete", (0.52, 0.50, 0.47)),
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"Kerb_North": ("M_Concrete", (0.52, 0.50, 0.47)),
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"Crossing_Markings": ("M_RoadPaint", (0.80, 0.80, 0.78)),
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}
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imported = 0
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for name in ("Terrain_DEM", "Road_Hollywood", "Sidewalk_South", "Sidewalk_North",
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"Kerb_South", "Kerb_North", "Crossing_Markings"):
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for name, (mat_name, rgb) in SURFACE_MATERIALS.items():
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mesh = unreal.EditorAssetLibrary.load_asset(f"/Game/Hollywood/Site/{name}")
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if mesh is None:
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continue
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@@ -103,8 +213,11 @@ def build():
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if actor:
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actor.static_mesh_component.set_static_mesh(mesh)
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actor.static_mesh_component.set_mobility(unreal.ComponentMobility.STATIC)
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mat = ensure_material(mat_name, rgb)
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if mat:
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actor.static_mesh_component.set_material(0, mat)
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imported += 1
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log(f"staged {imported} site meshes from /Game/Hollywood/Site")
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log(f"staged {imported} site meshes with explicit surface materials")
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# --- player start: north sidewalk, facing the hero frontage -------------
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# Signs were measured from the imported meshes rather than assumed: the FBX
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@@ -258,8 +258,17 @@ try:
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# 14 m back so the 14.5 m elevation fits: at 2 m the camera sees only
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# the colonnade's underside.
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("demo-spawn-view", unreal.Vector(-10722.5, -3500, 165), unreal.Vector(-10722.5, -1450, 700)),
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("demo-street-level", unreal.Vector(-11000, -400, 165), unreal.Vector(-10722.5, -1450, 500)),
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("demo-crossing", unreal.Vector(-23750, -1800, 480), unreal.Vector(-24291, -1400, 300)),
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# Street level, from the north sidewalk: the old camera sat at Y -400,
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# inside the facade body (which spans Y -1457..-200), so it looked at
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# the unlit back face. Y -2600 is on the sidewalk in front of the lit
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# elevation.
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("demo-street-level", unreal.Vector(-10850, -2600, 170), unreal.Vector(-10722.5, -1450, 400)),
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# The designated mid-block crossing. Street arc length runs from the
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# west end (s=0 at X -27966 cm), so s=130.1 m is UE X -14956, not the
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# -24291 the old camera used (that is the s=36.6 crossing). Camera sits
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# on the north sidewalk looking along the crosswalk itself, which is
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# the pedestrian's view and shows the zebra bars as bars.
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("demo-crossing", unreal.Vector(-15250, -2500, 400), unreal.Vector(-14956, 400, 150)),
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# the two north-side background buildings (TCL, Tussaud's) seen from
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# the south sidewalk, across Hollywood Blvd: their frontage and mass.
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("demo-north-buildings", unreal.Vector(-22800, -1000, 400), unreal.Vector(-22800, 3000, 300)),
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