Bump engine: pathfinding and collision detection modules

MrGameEng.Pathfinding (A*/Dijkstra/BFS + flow fields for crowds) and
MrGameEng.Collisions (spatial hash, pairs/queries/raycast) are now in
LittleSim.sln. Flow fields are the planned steering tool for villagers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CLAUDE.md

@@ -25,6 +25,19 @@ dotnet run --project src/LittleSim -c Release   # measure perf in Release only
 dotnet test LittleSim.sln                        # runs the engine test suites
 ```
 
+## Texture atlases
+
+Source images live in `textures/` (committed); the game only loads packed atlases from
+`src/LittleSim/Assets/Atlases` (also committed — the asset generator emits
+`GameAssets.Atlases.*` handles for them). After changing `textures/`, rebuild with:
+
+```
+dotnet run --project engine/tools/MrGameEng.AtlasTool -c Release -- textures src/LittleSim/Assets/Atlases --group-depth 2
+```
+
+Rebuilds are incremental (unchanged groups are skipped). Region keys are paths relative
+to `textures/` without extension: `atlas.GetRegion("things/plant/treeoak/TreeOakA")`.
+
 ## Submodule workflow
 
 Engine changes are committed **inside `engine/` first** (engine repo, its commit style),

LittleSim.sln

@@ -39,6 +39,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Graphics.Tests",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Input.Tests", "engine\tests\MrGameEng.Input.Tests\MrGameEng.Input.Tests.csproj", "{E9B94072-798E-4E09-BD9E-1FE6165D7EA4}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Pathfinding", "engine\src\MrGameEng.Pathfinding\MrGameEng.Pathfinding.csproj", "{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Collisions", "engine\src\MrGameEng.Collisions\MrGameEng.Collisions.csproj", "{9406DB4C-FABF-48FE-BEA7-25AD319D2172}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Pathfinding.Tests", "engine\tests\MrGameEng.Pathfinding.Tests\MrGameEng.Pathfinding.Tests.csproj", "{47E5E756-64F9-4B5A-8EC3-B016745166C4}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MrGameEng.Collisions.Tests", "engine\tests\MrGameEng.Collisions.Tests\MrGameEng.Collisions.Tests.csproj", "{B9161776-32FE-415E-9401-DC5BB87FC225}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -217,6 +225,54 @@ Global
 		{E9B94072-798E-4E09-BD9E-1FE6165D7EA4}.Release|x64.Build.0 = Release|Any CPU
 		{E9B94072-798E-4E09-BD9E-1FE6165D7EA4}.Release|x86.ActiveCfg = Release|Any CPU
 		{E9B94072-798E-4E09-BD9E-1FE6165D7EA4}.Release|x86.Build.0 = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|x64.Build.0 = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Debug|x86.Build.0 = Debug|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|x64.ActiveCfg = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|x64.Build.0 = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|x86.ActiveCfg = Release|Any CPU
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30}.Release|x86.Build.0 = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|x64.Build.0 = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Debug|x86.Build.0 = Debug|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|x64.ActiveCfg = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|x64.Build.0 = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|x86.ActiveCfg = Release|Any CPU
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172}.Release|x86.Build.0 = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|x64.Build.0 = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Debug|x86.Build.0 = Debug|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|x64.ActiveCfg = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|x64.Build.0 = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|x86.ActiveCfg = Release|Any CPU
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4}.Release|x86.Build.0 = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|x64.Build.0 = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Debug|x86.Build.0 = Debug|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|x64.ActiveCfg = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|x64.Build.0 = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|x86.ActiveCfg = Release|Any CPU
+		{B9161776-32FE-415E-9401-DC5BB87FC225}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -238,5 +294,9 @@ Global
 		{A3C128F7-6CCD-46CD-B935-C30E15EC7E1C} = {CD3B5CE5-C23F-38B4-04AA-A303F94731A5}
 		{21B1878F-2532-4D48-95DD-1C7268DCF1D5} = {CD3B5CE5-C23F-38B4-04AA-A303F94731A5}
 		{E9B94072-798E-4E09-BD9E-1FE6165D7EA4} = {CD3B5CE5-C23F-38B4-04AA-A303F94731A5}
+		{DC52F36D-2729-42DD-B1ED-B0D0CF95DC30} = {F4A69A46-AF86-AB4E-7D23-4CCCB7B9A519}
+		{9406DB4C-FABF-48FE-BEA7-25AD319D2172} = {F4A69A46-AF86-AB4E-7D23-4CCCB7B9A519}
+		{47E5E756-64F9-4B5A-8EC3-B016745166C4} = {CD3B5CE5-C23F-38B4-04AA-A303F94731A5}
+		{B9161776-32FE-415E-9401-DC5BB87FC225} = {CD3B5CE5-C23F-38B4-04AA-A303F94731A5}
 	EndGlobalSection
 EndGlobal

src/LittleSim/Assets/Atlases/damage.atlas

@@ -0,0 +1,55 @@
+{
+  "version": 1,
+  "name": "damage",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "damage.atlas.0.png",
+      "width": 1024,
+      "height": 256
+    }
+  ],
+  "regions": [
+    {
+      "key": "damage/corner",
+      "page": 0,
+      "x": 2,
+      "y": 2,
+      "w": 128,
+      "h": 128
+    },
+    {
+      "key": "damage/edge",
+      "page": 0,
+      "x": 132,
+      "y": 2,
+      "w": 128,
+      "h": 128
+    },
+    {
+      "key": "damage/scratch1",
+      "page": 0,
+      "x": 262,
+      "y": 2,
+      "w": 128,
+      "h": 128
+    },
+    {
+      "key": "damage/scratch2",
+      "page": 0,
+      "x": 392,
+      "y": 2,
+      "w": 128,
+      "h": 128
+    },
+    {
+      "key": "damage/scratch3",
+      "page": 0,
+      "x": 522,
+      "y": 2,
+      "w": 128,
+      "h": 128
+    }
+  ]
+}

src/LittleSim/Assets/Atlases/designations.atlas

@@ -0,0 +1,143 @@
+{
+  "version": 1,
+  "name": "designations",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "designations.atlas.0.png",
+      "width": 2048,
+      "height": 128
+    }
+  ],
+  "regions": [
+    {
+      "key": "designations/cutplant",
+      "page": 0,
+      "x": 2,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/deconstruct",
+      "page": 0,
+      "x": 68,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/flick",
+      "page": 0,
+      "x": 134,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/harvestplant",
+      "page": 0,
+      "x": 200,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/haul",
+      "page": 0,
+      "x": 266,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/hunt",
+      "page": 0,
+      "x": 332,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/mine",
+      "page": 0,
+      "x": 398,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/open",
+      "page": 0,
+      "x": 464,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/plan",
+      "page": 0,
+      "x": 530,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/rearmtrap",
+      "page": 0,
+      "x": 596,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/removefloor",
+      "page": 0,
+      "x": 662,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/slaughter",
+      "page": 0,
+      "x": 728,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/smoothfloor",
+      "page": 0,
+      "x": 794,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/strip",
+      "page": 0,
+      "x": 860,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/tame",
+      "page": 0,
+      "x": 926,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "designations/uninstall",
+      "page": 0,
+      "x": 992,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    }
+  ]
+}

src/LittleSim/Assets/Atlases/other.atlas

@@ -0,0 +1,79 @@
+{
+  "version": 1,
+  "name": "other",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "other.atlas.0.png",
+      "width": 2048,
+      "height": 2048
+    }
+  ],
+  "regions": [
+    {
+      "key": "other/fogofwar",
+      "page": 0,
+      "x": 1034,
+      "y": 1028,
+      "w": 128,
+      "h": 128
+    },
+    {
+      "key": "other/fogofwardetail",
+      "page": 0,
+      "x": 1542,
+      "y": 2,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "other/noise",
+      "page": 0,
+      "x": 2,
+      "y": 1028,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "other/ripples",
+      "page": 0,
+      "x": 2,
+      "y": 2,
+      "w": 1024,
+      "h": 1024
+    },
+    {
+      "key": "other/roughalphaadd",
+      "page": 0,
+      "x": 260,
+      "y": 1028,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "other/shieldbubble",
+      "page": 0,
+      "x": 518,
+      "y": 1028,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "other/snow",
+      "page": 0,
+      "x": 1028,
+      "y": 2,
+      "w": 512,
+      "h": 512
+    },
+    {
+      "key": "other/snowmacro",
+      "page": 0,
+      "x": 776,
+      "y": 1028,
+      "w": 256,
+      "h": 256
+    }
+  ]
+}

src/LittleSim/Assets/Atlases/terrain.scatter.atlas

@@ -0,0 +1,63 @@
+{
+  "version": 1,
+  "name": "terrain.scatter",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "terrain.scatter.atlas.0.png",
+      "width": 2048,
+      "height": 512
+    }
+  ],
+  "regions": [
+    {
+      "key": "terrain/scatter/debrisstonea",
+      "page": 0,
+      "x": 1034,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "terrain/scatter/debrisstoneb",
+      "page": 0,
+      "x": 1100,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "terrain/scatter/dirtsmeara",
+      "page": 0,
+      "x": 2,
+      "y": 2,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "terrain/scatter/dirtsmearb",
+      "page": 0,
+      "x": 260,
+      "y": 2,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "terrain/scatter/graysmeara",
+      "page": 0,
+      "x": 518,
+      "y": 2,
+      "w": 256,
+      "h": 256
+    },
+    {
+      "key": "terrain/scatter/graysmearb",
+      "page": 0,
+      "x": 776,
+      "y": 2,
+      "w": 256,
+      "h": 256
+    }
+  ]
+}

src/LittleSim/Assets/Atlases/terrain.surfaces.atlas

@@ -0,0 +1,331 @@
+{
+  "version": 1,
+  "name": "terrain.surfaces",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "terrain.surfaces.atlas.0.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.1.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.2.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.3.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.4.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.5.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.6.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.7.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.8.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.9.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.10.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.11.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.12.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.13.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.14.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.15.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.16.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.17.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.18.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.19.png",
+      "width": 2048,
+      "height": 2048
+    },
+    {
+      "file": "terrain.surfaces.atlas.20.png",
+      "width": 2048,
+      "height": 2048
+    }
+  ],
+  "regions": [
+    {
+      "key": "terrain/surfaces/Marsh",
+      "page": 20,
+      "x": 1542,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "terrain/surfaces/Marsh_bright",
+      "page": 20,
+      "x": 1608,
+      "y": 2,
+      "w": 64,
+      "h": 64
+    },
+    {
+      "key": "terrain/surfaces/brokenasphalt",
+      "page": 0,
+      "x": 2,
+      "y": 2,
+      "w": 1024,
+      "h": 1024
+    },
+    {
+      "key": "terrain/surfaces/burnedcarpet",
+      "page": 1,
+      "x": 2,
+      "y": 2,
+      "w": 1024,
+      "h": 1024
+    },
+    {
+      "key": "terrain/surfaces/burnedwoodfloor",
+      "page": 2,
+      "x": 2,
+      "y": 2,
+      "w": 1024,
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+}

src/LittleSim/Assets/Atlases/things.filth.atlas

@@ -0,0 +1,159 @@
+{
+  "version": 1,
+  "name": "things.filth",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
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+      "width": 2048,
+      "height": 256
+    }
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+}

src/LittleSim/Assets/Atlases/things.gas.atlas

@@ -0,0 +1,23 @@
+{
+  "version": 1,
+  "name": "things.gas",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
+    {
+      "file": "things.gas.atlas.0.png",
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+      "height": 256
+    }
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+      "h": 128
+    }
+  ]
+}

src/LittleSim/Assets/Atlases/things.mote.atlas

@@ -0,0 +1,543 @@
+{
+  "version": 1,
+  "name": "things.mote",
+  "pageSize": 2048,
+  "padding": 2,
+  "pages": [
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+      "width": 2048,
+      "height": 512
+    }
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+}