-- Terrain:  rolling hills from a heightmap image (testScripts/hills.png from util/makeHills.py)
-- with a tiled ground texture, under the sky with fog; the dragon stands on a slope placed by
-- terrainGetHeight, and crates dropped on the hills tumble down them on the height field body.
local font   = fontLoad("Singe/FreeSansBold.ttf", 28)
local frames = 0

fontSelect(font)
sceneEnable(true)
sceneSetSky("testScripts/sky.png")
sceneSetFog(190, 200, 215, 40, 160)
sceneSetShadowSize(2048)
sceneSetShadowDistance(80)

local ground = materialNew()
materialSetTexture(ground, "testScripts/brick.ktx2")
materialSetTiling(ground, 24, 24)
materialSetRoughness(ground, 0.95)
local hills = nodeNew()
nodeSetMesh(hills, meshHeightmap("testScripts/hills.png", 120, 14, 120), ground)
bodyNew(hills, BODY_STATIC, SHAPE_MESH)

-- The dragon, its feet on the slope wherever the terrain is there.
local dragon = modelInstance(modelLoad("testScripts/Models/DragonModel.glb"))
nodeSetScale(dragon, 0.4)
nodeSetPosition(dragon, -8, terrainGetHeight(hills, -8, 3) or 0, 3)
nodeSetRotation(dragon, 0, 40, 0)

-- Crates dropped along a ridge.
local wood = materialNew()
materialSetColor(wood, 150, 100, 55)
local crates = {}
for i = 1, 10 do
	local crate = nodeNew()
	nodeSetMesh(crate, meshBox(1, 1, 1), wood)
	local x, z = -20 + i * 4, -12
	nodeSetPosition(crate, x, (terrainGetHeight(hills, x, z) or 0) + 6, z)
	nodeSetRotation(crate, i * 17, i * 31, 0)
	bodyNew(crate, BODY_DYNAMIC, SHAPE_BOX, 1, 1, 1)
	crates[i] = crate
end

local sun = lightNew(LIGHT_DIRECTIONAL)
nodeSetPosition(sun, 30, 40, 20)
nodeLookAt(sun, 0, 0, 0)
lightSetIntensity(sun, 2.5)
lightSetShadow(sun, true)

local camera = nodeNew()
cameraSet(camera)
cameraSetPerspective(55, 0.1, 300)

local stops = {
	{ 0, 12, 40,     0, 4, 0 },        -- The hills from the valley's edge
	{ -18, 8, 12,    -8, 4, 3 },       -- The dragon on its slope
	{ 4, 10, -2,     0, 3, -14 },      -- The crates on the ridge
	{ 30, 25, 30,    0, 2, 0 },        -- High corner view, fog in the distance
}

function onOverlayUpdate()
	local stop = stops[math.min(#stops, math.floor(frames / 45) + 1)]
	frames = frames + 1
	nodeSetPosition(camera, stop[1], stop[2], stop[3])
	nodeLookAt(camera, stop[4], stop[5], stop[6])
	local x, y, z = nodeGetWorldPosition(crates[5])
	local ground = terrainGetHeight(hills, x, z) or 0
	overlayClear()
	fontPrint(20, 20, string.format("Terrain, frame %d  crate 5 at %.1f %.1f %.1f, ground %.1f", frames, x, y, z, ground))
	if frames == 40 or frames == 85 or frames == 130 or frames == 175 then
		singeScreenshot()
		debugPrint(string.format("frame %d crate 5 at %.2f %.2f %.2f ground %.2f", frames, x, y, z, ground))
	end
	if frames == 180 then
		singeQuit()
	end
end