Terrain generation example

examples/Environment/Terrain/main.lua

@@ -0,0 +1,48 @@
+local terrain
+
+local function grid(subdivisions)
+  local size = 1 / math.floor(subdivisions or 1)
+  local vertices = {}
+  local indices  = {}
+  for y = -0.5, 0.5, size do
+    for x = -0.5, 0.5, size do
+      table.insert(vertices, {x, y, 0})
+      table.insert(vertices, {x, y + size, 0})
+      table.insert(vertices, {x + size, y, 0})
+      table.insert(vertices, {x + size, y + size, 0})
+      table.insert(indices, #vertices - 3)
+      table.insert(indices, #vertices - 2)
+      table.insert(indices, #vertices - 1)
+      table.insert(indices, #vertices - 2)
+      table.insert(indices, #vertices)
+      table.insert(indices, #vertices - 1)
+    end
+  end
+  local meshFormat = {{'lovrPosition', 'float', 3}}
+  local mesh = lovr.graphics.newMesh(meshFormat, vertices, "triangles", "dynamic", true)
+  mesh:setVertexMap(indices)
+  return mesh
+end
+
+function lovr.load()
+  lovr.graphics.setBackgroundColor(0.208, 0.208, 0.275)
+  lovr.graphics.setLineWidth(5)
+  terrain = grid(100)
+  local offset = lovr.math.noise(0, 0) -- ensure zero height at origin
+  for vi = 1, terrain:getVertexCount() do
+    local x,y,z = terrain:getVertex(vi)
+    z = (lovr.math.noise(x * 10, y * 10) - offset) / 20
+    terrain:setVertex(vi, {x,y,z})
+  end
+end
+
+function lovr.draw()
+  lovr.graphics.rotate(math.pi/2, 1, 0, 0)
+  lovr.graphics.scale(100)
+  lovr.graphics.setWireframe(false)
+  lovr.graphics.setColor(0.565, 0.404, 0.463)
+  terrain:draw()
+  lovr.graphics.setWireframe(true)
+  lovr.graphics.setColor(0.388, 0.302, 0.412, 0.5)
+  terrain:draw()
+end

examples/init.lua

@@ -19,6 +19,7 @@ return {
   'Locomotion/Walking_In_Place',
   'Environment/Grid',
   'Environment/Skybox',
+  'Environment/Terrain',
   'Lighting/Cel_Shading',
   'Lighting/PBR_Materials',
   'Animation/Playback',