OMA-LANDER: rebrand and tune physics, camera, terrain

Rename to OMA-LANDER in title bar and title screen. Retune lander
physics for a gentler, original-feel experience (lower gravity, slower
rotation, reduced fuel burn, speed cap, top-of-world clamp) and fix
thrust vx sign. Rework camera to frame lander and terrain together
with a smoother altitude-based zoom. Simplify terrain: pads at fixed
zones, cleaner generation loop, zoom-invariant multiplier labels.
Stronger abort burst (kills horizontal speed, halves downward vy).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

conf.lua

@@ -1,5 +1,5 @@
 function love.conf(t)
-    t.window.title = "LUNAR LANDER"
+    t.window.title = "OMA-LANDER"
     t.window.width = 1024
     t.window.height = 768
     t.window.resizable = true

game/camera.lua

@@ -2,30 +2,40 @@ local World = require("game.world")
 
 local Camera = {
     x = 2000,
-    y = 400,
+    y = 900,
-    zoom = 0.5,
+    zoom = 0.35,
 }
 
-local BASE_ALT = 1200
+local MAX_ZOOM = 3.5
-local MAX_ZOOM = 4.0
+local MIN_ZOOM = 0.3
-local MIN_ZOOM = 0.35
+local ZOOM_SPEED = 2.0
 
 function Camera.update(lander, terrain, dt)
-    -- Track lander position
+    -- Track lander X
     Camera.x = lander.x
-    Camera.y = lander.y
 
-    -- Compute altitude
+    -- Get ground height below lander
     local groundY = terrain.getHeightAt(lander.x)
     local altitude = groundY - lander.y
-    altitude = math.max(altitude, 10)
 
-    -- Zoom based on altitude
+    -- Camera Y: always frame BOTH the lander and the terrain
-    local targetZoom = BASE_ALT / altitude
+    -- Centre the view between the lander and the ground, biased toward showing terrain
+    local midY = (lander.y + groundY) / 2
+    -- Bias: keep terrain in the lower third even at high altitude
+    local targetY = lander.y + altitude * 0.45
+
+    Camera.y = Camera.y + (targetY - Camera.y) * math.min(1, dt * 3)
+
+    -- Zoom: fit the distance from lander to ground within the viewport
+    -- We want the full altitude span to fit in about 70% of screen height
+    local sw, sh = World.screenW, World.screenH
+    local effectiveScale = World.baseScale
+    local neededHeight = math.max(altitude + 100, 200)  -- minimum view range
+    local viewportFraction = 0.7
+    local targetZoom = (sh * viewportFraction) / (neededHeight * effectiveScale)
     targetZoom = math.max(MIN_ZOOM, math.min(MAX_ZOOM, targetZoom))
 
-    -- Smooth lerp
+    Camera.zoom = Camera.zoom + (targetZoom - Camera.zoom) * math.min(1, dt * ZOOM_SPEED)
-    Camera.zoom = Camera.zoom + (targetZoom - Camera.zoom) * math.min(1, dt * 2.5)
 end
 
 function Camera.getAltitude(landerY, terrain, landerX)
@@ -61,7 +71,7 @@ end
 
 function Camera.reset()
     Camera.x = 2000
-    Camera.y = 400
+    Camera.y = 900
     Camera.zoom = MIN_ZOOM
 end
 

game/lander.lua

@@ -3,12 +3,16 @@ local Palette = require("rendering.palette")
 
 local Lander = {}
 
-local GRAVITY = 25
+-- Physics tuned to match original Lunar Lander feel:
-local THRUST_ACCEL = 60
+-- Gentle lunar gravity, thrust comfortably overcomes it,
-local ROT_SPEED = 2.1  -- ~120 deg/sec in radians
+-- deliberate rotation, fuel lasts long enough to learn
-local FUEL_RATE = 12    -- fuel per second at full thrust
+local GRAVITY = 12          -- gentle lunar pull (original was ~1/6 earth)
+local THRUST_ACCEL = 36     -- about 3x gravity — can hover and climb
+local ROT_SPEED = 1.4       -- ~80 deg/sec — deliberate, not twitchy
+local FUEL_RATE = 6          -- fuel per second — 750 gives ~125 sec of thrust
+local MAX_SPEED = 120        -- terminal velocity cap
 
--- Lander shape (local coords, 0 = pointing up, Y+ down)
+-- Lander shape (local coords, angle 0 = pointing up, Y+ is down in world)
 local BODY = {
     {-8, -8}, {-4, -12}, {4, -12}, {8, -8},
     {10, 0}, {8, 6}, {-8, 6}, {-10, 0},
@@ -41,11 +45,11 @@ local ANTENNA = {
 local lander = {}
 
 function Lander.init()
-    lander.x = World.WORLD_W / 2 + (math.random() - 0.5) * 1000
+    lander.x = World.WORLD_W / 2 + (math.random() - 0.5) * 800
     lander.y = 200
-    lander.vx = 20 + math.random() * 20
+    lander.vx = 5 + math.random() * 8     -- gentle initial drift
-    lander.vy = 5 + math.random() * 10
+    lander.vy = 2 + math.random() * 3     -- slight downward
-    lander.angle = 0  -- 0 = pointing up
+    lander.angle = 0
     lander.alive = true
     lander.landed = false
     lander.thrusting = false
@@ -65,7 +69,7 @@ end
 function Lander.update(dt)
     if not lander.alive or lander.landed then return end
 
-    -- Gravity
+    -- Gravity (always pulls down)
     lander.vy = lander.vy + GRAVITY * dt
 
     -- Rotation
@@ -76,46 +80,60 @@ function Lander.update(dt)
         lander.angle = lander.angle + ROT_SPEED * dt
     end
 
-    -- Thrust
+    -- Thrust (fires out the bottom of the lander, pushing opposite)
     lander.thrusting = love.keyboard.isDown("up", "w") and World.fuel > 0
     if lander.thrusting then
-        -- Thrust in the direction the lander is pointing (up from lander's perspective)
+        lander.vx = lander.vx + math.sin(lander.angle) * THRUST_ACCEL * dt
-        lander.vx = lander.vx - math.sin(lander.angle) * THRUST_ACCEL * dt
         lander.vy = lander.vy - math.cos(lander.angle) * THRUST_ACCEL * dt
         World.fuel = math.max(0, World.fuel - FUEL_RATE * dt)
     end
 
+    -- Cap speed so it doesn't get out of control
+    local speed = math.sqrt(lander.vx * lander.vx + lander.vy * lander.vy)
+    if speed > MAX_SPEED then
+        lander.vx = lander.vx / speed * MAX_SPEED
+        lander.vy = lander.vy / speed * MAX_SPEED
+    end
+
     -- Move
     lander.x = lander.x + lander.vx * dt
     lander.y = lander.y + lander.vy * dt
 
-    -- Clamp X
+    -- Clamp X to world bounds
     lander.x = math.max(20, math.min(World.WORLD_W - 20, lander.x))
+
+    -- Don't let lander fly off the top
+    if lander.y < 0 then
+        lander.y = 0
+        lander.vy = math.max(0, lander.vy)
+    end
 end
 
 function Lander.abort()
     if not lander.alive or lander.landed then return end
     if World.fuel < 10 then return end
 
-    -- Auto-level: snap angle toward 0
+    -- Auto-level: snap angle to upright
-    lander.angle = lander.angle * 0.3
+    lander.angle = lander.angle * 0.1
-    -- Full thrust burst
+    -- Strong upward thrust burst — halve downward velocity and push up
-    lander.vy = lander.vy - THRUST_ACCEL * 0.5
+    if lander.vy > 0 then
-    -- Costs a chunk of fuel
+        lander.vy = lander.vy * 0.3
-    World.fuel = math.max(0, World.fuel - 50)
+    end
+    lander.vy = lander.vy - THRUST_ACCEL * 0.6
+    -- Kill most horizontal speed
+    lander.vx = lander.vx * 0.3
+    -- Heavy fuel cost
+    World.fuel = math.max(0, World.fuel - 60)
 end
 
 function Lander.getCollisionPoints()
-    -- Return transformed foot positions for terrain collision
     local pts = {}
-    -- Foot endpoints
     local footPts = {{-17, 16}, {-11, 16}, {11, 16}, {17, 16}}
     for _, fp in ipairs(footPts) do
         local wx, wy = transformPoint(fp[1], fp[2], lander.angle, lander.x, lander.y)
         table.insert(pts, {x = wx, y = wy})
     end
-    -- Body bottom
+    local bodyBottom = {{-8, 6}, {8, 6}, {0, 6}}
-    local bodyBottom = {{-8, 6}, {8, 6}}
     for _, bp in ipairs(bodyBottom) do
         local wx, wy = transformPoint(bp[1], bp[2], lander.angle, lander.x, lander.y)
         table.insert(pts, {x = wx, y = wy})
@@ -186,25 +204,28 @@ function Lander.draw()
         love.graphics.line(x1, y1, x2, y2)
     end
 
-    -- Thrust flame
+    -- Thrust flame (fully transformed)
     if lander.thrusting then
         love.graphics.setColor(p.thrust)
         love.graphics.setLineWidth(2)
         local flameLen = 10 + math.random() * 15
         local flameSpread = 3 + math.random() * 3
 
-        local fx1, fy1 = transformPoint(-flameSpread, 6, a, cx, cy)
+        local fx1, fy1 = transformPoint(-flameSpread, 8, a, cx, cy)
-        local fx2, fy2 = transformPoint(flameSpread, 6, a, cx, cy)
+        local fx2, fy2 = transformPoint(flameSpread, 8, a, cx, cy)
-        local ftx, fty = transformPoint((math.random()-0.5)*3, 6 + flameLen, a, cx, cy)
+        local ftx, fty = transformPoint((math.random()-0.5)*3, 8 + flameLen, a, cx, cy)
 
         love.graphics.line(fx1, fy1, ftx, fty)
         love.graphics.line(fx2, fy2, ftx, fty)
 
-        -- Inner flame
+        -- Inner bright flame
-        local flameLen2 = 5 + math.random() * 8
-        local ft2x, ft2y = transformPoint((math.random()-0.5)*2, 6 + flameLen2, a, cx, cy)
         love.graphics.setColor(p.bright)
-        love.graphics.line(cx, cy + 3, ft2x, ft2y)
+        local flameLen2 = 5 + math.random() * 8
+        local fi1x, fi1y = transformPoint(-1.5, 8, a, cx, cy)
+        local fi2x, fi2y = transformPoint(1.5, 8, a, cx, cy)
+        local ft2x, ft2y = transformPoint((math.random()-0.5)*1.5, 8 + flameLen2, a, cx, cy)
+        love.graphics.line(fi1x, fi1y, ft2x, ft2y)
+        love.graphics.line(fi2x, fi2y, ft2x, ft2y)
     end
 end
 

game/terrain.lua

@@ -12,90 +12,66 @@ function Terrain.generate()
 
     local W = World.WORLD_W
     local baseline = 1600
-    local step = 30
 
-    -- Place landing pads first
+    -- Place 3 landing pads at fixed zones to avoid overlap issues
     local padDefs = {
-        {width = 120, mult = 2, label = "2X"},
+        {cx = W * 0.2, width = 120, mult = 2, label = "2X"},
-        {width = 80,  mult = 3, label = "3X"},
+        {cx = W * 0.55, width = 80,  mult = 3, label = "3X"},
-        {width = 50,  mult = 5, label = "5X"},
+        {cx = W * 0.8, width = 50,  mult = 5, label = "5X"},
     }
 
-    -- Distribute pads across the terrain
-    local padPositions = {}
-    local usedZones = {}
     for _, def in ipairs(padDefs) do
-        local attempts = 0
-        local px
-        repeat
-            px = 400 + math.random() * (W - 800)
-            attempts = attempts + 1
-            local ok = true
-            for _, used in ipairs(usedZones) do
-                if math.abs(px - used) < 400 then ok = false; break end
-            end
-            if ok then break end
-        until attempts > 50
-
         local py = baseline + (math.random() - 0.5) * 200
-        table.insert(padPositions, {x = px, y = py, width = def.width, mult = def.mult, label = def.label})
-        table.insert(usedZones, px)
         table.insert(pads, {
-            x1 = px - def.width / 2,
+            x1 = def.cx - def.width / 2,
-            x2 = px + def.width / 2,
+            x2 = def.cx + def.width / 2,
             y = py,
             mult = def.mult,
             label = def.label,
         })
     end
 
-    -- Sort pads by X for terrain generation
     table.sort(pads, function(a, b) return a.x1 < b.x1 end)
 
-    -- Generate terrain points left to right
+    -- Generate terrain left to right, inserting pads as flat segments
     local x = 0
-    local y = baseline + (math.random() - 0.5) * 100
+    local y = baseline + (math.random() - 0.5) * 80
-    table.insert(points, {x = x, y = y})
+    table.insert(points, {x = 0, y = y})
+
+    local padIdx = 1
 
     while x < W do
-        -- Check if we're approaching a pad
+        -- Check if next pad is coming up
-        local onPad = false
+        if padIdx <= #pads and x >= pads[padIdx].x1 - 40 then
-        local currentPad = nil
+            local pad = pads[padIdx]
-        for _, pad in ipairs(pads) do
+            -- Slope to pad start
-            if x >= pad.x1 - step and x <= pad.x2 + step then
+            table.insert(points, {x = pad.x1 - 5, y = y})
-                onPad = true
+            table.insert(points, {x = pad.x1, y = pad.y})
-                currentPad = pad
-                break
-            end
-        end
-
-        if onPad and currentPad then
-            -- Transition to pad level
-            if x < currentPad.x1 then
-                -- Approach: slope down/up to pad
-                table.insert(points, {x = currentPad.x1 - 5, y = y})
-                table.insert(points, {x = currentPad.x1, y = currentPad.y})
-                x = currentPad.x1
-            end
             -- Flat pad
-            table.insert(points, {x = currentPad.x2, y = currentPad.y})
+            table.insert(points, {x = pad.x2, y = pad.y})
-            x = currentPad.x2
+            x = pad.x2 + 1
-            y = currentPad.y
+            y = pad.y
-            -- Resume jagged after pad
+            padIdx = padIdx + 1
-            x = x + step * 0.5
+            -- Resume jagged
-            y = y + (math.random() - 0.5) * 60
+            local jx = x + 20 + math.random() * 30
-            table.insert(points, {x = x, y = y})
+            y = y + (math.random() - 0.5) * 80
+            y = math.max(baseline - 250, math.min(baseline + 250, y))
+            table.insert(points, {x = jx, y = y})
+            x = jx
         else
-            x = x + step + math.random() * step
+            -- Normal jagged terrain
-            -- Jagged variation
+            local step = 25 + math.random() * 35
-            y = y + (math.random() - 0.5) * 120
+            x = x + step
+            y = y + (math.random() - 0.5) * 100
             y = math.max(baseline - 250, math.min(baseline + 250, y))
             table.insert(points, {x = x, y = y})
         end
     end
 
-    -- Ensure last point reaches edge
+    -- Close at right edge
+    if points[#points].x < W then
         table.insert(points, {x = W, y = points[#points].y})
+    end
 end
 
 function Terrain.getPoints()
@@ -107,7 +83,6 @@ function Terrain.getPads()
 end
 
 function Terrain.getHeightAt(wx)
-    -- Find terrain height at world X by interpolating between points
     if #points < 2 then return 1600 end
     if wx <= points[1].x then return points[1].y end
     if wx >= points[#points].x then return points[#points].y end
@@ -133,13 +108,13 @@ end
 function Terrain.draw(visMinX, visMaxX)
     local p = Palette.get()
 
-    -- Draw terrain surface
+    -- Terrain surface
     love.graphics.setColor(p.terrain)
     love.graphics.setLineWidth(2)
 
     local pts = {}
     for _, pt in ipairs(points) do
-        if pt.x >= visMinX - 100 and pt.x <= visMaxX + 100 then
+        if pt.x >= visMinX - 200 and pt.x <= visMaxX + 200 then
             table.insert(pts, pt.x)
             table.insert(pts, pt.y)
         end
@@ -148,17 +123,24 @@ function Terrain.draw(visMinX, visMaxX)
         love.graphics.line(pts)
     end
 
-    -- Draw landing pads (brighter, with labels)
+    -- Landing pads (brighter)
-    love.graphics.setColor(p.pad)
-    love.graphics.setLineWidth(3)
     for _, pad in ipairs(pads) do
         if pad.x2 >= visMinX and pad.x1 <= visMaxX then
+            love.graphics.setColor(p.pad)
+            love.graphics.setLineWidth(3)
             love.graphics.line(pad.x1, pad.y, pad.x2, pad.y)
 
-            -- Label below pad
+            -- Multiplier label — constant screen size regardless of zoom
-            love.graphics.setColor(p.pad[1], p.pad[2], p.pad[3], 0.7)
+            love.graphics.setColor(p.pad[1], p.pad[2], p.pad[3], 0.8)
-            local labelX = (pad.x1 + pad.x2) / 2
+            local cx = (pad.x1 + pad.x2) / 2
-            love.graphics.print(pad.label, labelX - 8, pad.y + 5)
+            local Camera = require("game.camera")
+            local World = require("game.world")
+            local invZoom = 1 / (World.baseScale * Camera.getZoom())
+            love.graphics.push()
+            love.graphics.translate(cx, pad.y + 15 * invZoom)
+            love.graphics.scale(invZoom * 0.8, invZoom * 0.8)
+            love.graphics.printf(pad.label, -50, 0, 100, "center")
+            love.graphics.pop()
         end
     end
 end

main.lua

@@ -99,7 +99,7 @@ local function drawTitleScreen()
     local titleY = sh * 0.15
     love.graphics.setFont(Fonts.large)
     love.graphics.setColor(p.bright)
-    love.graphics.printf("LUNAR LANDER", 0, titleY, sw, "center")
+    love.graphics.printf("OMA-LANDER", 0, titleY, sw, "center")
 
     -- Controls
     love.graphics.setFont(Fonts.small)