kke_demo: the showcase

kke_demo (games/showcase/) is the one demo that has to prove every system at once (ACTION_PLAN 1.4, issue #12). You walk a course where each spot shows one part of the engine. When you stand at one, the HUD at the bottom says what to try there.

The course

Positions are in games/showcase/Layout.h, so the level, the stress test and the HUD agree.

Station	Where	What it shows
Crate pile	(4, -3)	Jolt rigid bodies: push them (E / right click) or shoot them over
Breaking yard	(14, -6)	FEMFX glass, plank and stone wall that break for real, with crates under the glass that the shards push (FEMFX-Jolt bridge, PHYSICS_BRIDGE.md)
Parkour lane	x = 20, z 28 to 5	Vault the fences, climb the blocks, sprint for the 2.1 m ledge, hang from the 3 m wall. Nothing is marked up: kke::Locomotion reads the shapes
Trick course	x = 26	A 12 m wall to run along, thin pillars to leap between, and a thin wall under a beam for the leap up (MOVEMENT.md)
Lava	(0, 20)	Lava (ParticleFluid) pours on a block that melts (MeltVolume): ice, wax, then aluminium. Crates and the character push the lava aside. It runs only while a camera is within 18 m
Pool	(-18, 20)	Crates, planks and a raft float on Gerstner waves (kke::boxBuoyancy) and steel sinks. Vault the wall to wade in
Moving platform	(-14, 6)	Stand on it and it carries you
Low roof	(10, 6)	Crouch (C) to get under it
Stairs, ramp, too-steep slope, pillars	around (-8, -4) and (8, -10)	Steps, slopes the controller walks, a slope it slides off, and the camera's spring arm

With POLYGON Nature and POLYGON Town installed, Synty art dresses the course around the stations (course_art.scene.json, list in SCENES.md): a volcanic corner at the lava, a park pond at the pool, a work yard at the breaking yard, hedges, pines, mountains and a town beyond the walls. It stays out of the paths the stations need. Without the packs the course is the plain boxes it is built from.

The Scenes panel visits Synty-built levels far from the course (SCENES.md).

HUD and menu

• The HUD (RmlUi, ui/showcase_hud.rml) shows what the character is doing (running, vaulting, hanging, wall running, and so on) with the measured speed. Near a station it shows the station's hint, plus live numbers where there are some, such as how much of the lava block is left.
• Esc, or Start on a controller, opens the pause menu (ui/showcase_pause.rml). It has Resume, Back to the start, 1 to 4 players (split screen), engine panels and Quit. An offline game stops while the menu is open. Online, the others keep playing. B on a controller closes it, and the d-pad and A move through it.
• F1 shows the engine's ImGui panels. The Showcase panel has the controls, movement tuning, performance, character, lighting, lava and split screen settings.

Scripted runs (screenshots, checks)

Variable	What it does
KKE_SKIP_INTRO=1	No logo intro (needed headless)
KKE_START_AT=x,y,z[,yaw]	Start there, facing yaw (the camera too)
KKE_DEMO_HANG=1	Jump, hang, shimmy around the end and jump back at the lane's 3 m wall
KKE_DEMO_TRICKS=1	Wall run and wall jump, then ledge leaps along the pillars and the leap up to the beam
KKE_DEMO_BRIDGE=1	Drops an iron ball on the yard's glass, then rolls one into a crate, and logs how far the crates moved
KKE_SPLIT=2..4, KKE_OVERHEAD=1	Local split screen, and an overhead picture-in-picture view
KKE_MENU=1	Opens the pause menu after 1.5 s
KKE_SCENE=town_block	Starts in a Synty scene
KKE_DEMO_AUTOPILOT=1	The character (and extra split-screen players) run the parkour lane on their own
KKE_BRIDGE=0	Turns the FEMFX-Jolt bridge off, to compare
KKE_COURSE_ART=0	Leaves the Synty art off the course, to compare
KKE_STRESS_TEST=1	The stress test (BENCHMARKS.md)

Assets

The course itself is built from boxes in code, so it needs no asset pack. What it loads:

• Optional: the course art (POLYGON Nature, POLYGON Town), listed asset by asset in SCENES.md.

• The character and its animations: Quaternius' Universal Animation Library (CC0), volumes 1 and 2 (assets/animations/, fetched, not committed). From volume 2 it keeps only SafetyVault, ClimbUp_1m, ClimbUp_2m, WallRun_L_Loop and WallRun_R_Loop.

• Optional: any Synty SK_Character as the player (Character panel), and the Synty scenes. Synty packs are never committed. Each scene lists what it uses in SCENES.md.
• UI: Noto Sans fonts and the RmlUi theme from games/rmlui_demo/ui/.