Grass chunks

Assets/NewBehaviourScript.cs

@@ -1,18 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-public class NewBehaviourScript : MonoBehaviour
-{
-    // Start is called before the first frame update
-    void Start()
-    {
-        
-    }
-
-    // Update is called once per frame
-    void Update()
-    {
-        
-    }
-}

Assets/Prefabs.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: d22fe26927ae36242bf398620ebf771b
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Prefabs/GrassChunk.prefab

@@ -0,0 +1,104 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!1 &3358322397150752750
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 7199769165755445272}
+  - component: {fileID: 8216369470827376369}
+  - component: {fileID: 5936879447658928899}
+  - component: {fileID: 6414307754184109852}
+  m_Layer: 0
+  m_Name: GrassChunk
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &7199769165755445272
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3358322397150752750}
+  serializedVersion: 2
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!23 &8216369470827376369
+MeshRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3358322397150752750}
+  m_Enabled: 1
+  m_CastShadows: 1
+  m_ReceiveShadows: 1
+  m_DynamicOccludee: 1
+  m_StaticShadowCaster: 0
+  m_MotionVectors: 1
+  m_LightProbeUsage: 1
+  m_ReflectionProbeUsage: 1
+  m_RayTracingMode: 2
+  m_RayTraceProcedural: 0
+  m_RenderingLayerMask: 1
+  m_RendererPriority: 0
+  m_Materials:
+  - {fileID: 0}
+  m_StaticBatchInfo:
+    firstSubMesh: 0
+    subMeshCount: 0
+  m_StaticBatchRoot: {fileID: 0}
+  m_ProbeAnchor: {fileID: 0}
+  m_LightProbeVolumeOverride: {fileID: 0}
+  m_ScaleInLightmap: 1
+  m_ReceiveGI: 1
+  m_PreserveUVs: 0
+  m_IgnoreNormalsForChartDetection: 0
+  m_ImportantGI: 0
+  m_StitchLightmapSeams: 1
+  m_SelectedEditorRenderState: 3
+  m_MinimumChartSize: 4
+  m_AutoUVMaxDistance: 0.5
+  m_AutoUVMaxAngle: 89
+  m_LightmapParameters: {fileID: 0}
+  m_SortingLayerID: 0
+  m_SortingLayer: 0
+  m_SortingOrder: 0
+  m_AdditionalVertexStreams: {fileID: 0}
+--- !u!33 &5936879447658928899
+MeshFilter:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3358322397150752750}
+  m_Mesh: {fileID: 0}
+--- !u!114 &6414307754184109852
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3358322397150752750}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 54ba144eac404724ab9ca2a3e30e101f, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  bounds:
+    m_Center: {x: 0, y: 0, z: 0}
+    m_Extent: {x: 0, y: 0, z: 0}
+  extendedBounds:
+    m_Center: {x: 0, y: 0, z: 0}
+    m_Extent: {x: 0, y: 0, z: 0}

Assets/Prefabs/GrassChunk.prefab.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: abb47bb4e9622f7428302dfa4730d722
+PrefabImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: aa31b79c832c190499d4da4117b13f2f
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Editor.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 3b4e1af1f1e786a4d8b2df8c78148a13
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Editor/GrassFieldEditor.cs

@@ -0,0 +1,16 @@
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+
+[CustomEditor(typeof(GrassField))]
+public class GrassFieldEditor : Editor {
+    public override void OnInspectorGUI() {
+        base.OnInspectorGUI();
+
+        if (GUILayout.Button("Generate")) {
+            ((GrassField) target).GenerateGrassField();
+            // Scene may have been modified
+            EditorSceneManager.MarkSceneDirty(EditorSceneManager.GetActiveScene());
+        }
+    }
+}

Assets/Scripts/Editor/GrassFieldEditor.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 40ba82550d5e2e9d4a1a27ed9e99307c
+guid: 02ad1dbbec5250f469ad3925cfcead3f
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Assets/Scripts/GrassChunk.cs

@@ -0,0 +1,12 @@
+using System;
+using UnityEngine;
+
+[RequireComponent(typeof(MeshRenderer)), RequireComponent(typeof(MeshFilter))]
+public class GrassChunk : MonoBehaviour {
+    void OnDrawGizmos() {
+        Gizmos.color = Color.yellow;
+
+        var renderer = GetComponent<MeshRenderer>();
+        Gizmos.DrawWireCube(renderer.bounds.center, renderer.bounds.size);
+    }
+}

Assets/Scripts/GrassChunk.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 54ba144eac404724ab9ca2a3e30e101f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/GrassField.cs

@@ -0,0 +1,93 @@
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Assertions;
+
+public class GrassField : MonoBehaviour {
+    public int size = 100;
+    public int numChunks = 5;
+    public GrassChunk chunkPrefab;
+
+    private struct BladeData {
+        public Vector3 rootPosition;
+        public Vector3 tipPosition;
+    }
+
+    public void GenerateGrassField() {
+        Debug.Log("Generating grass field... ");
+
+        var blades = GenerateBlades();
+        CreateChunks(blades);
+
+        Debug.Log("Generating grass field done");
+    }
+
+    private BladeData[] GenerateBlades() {
+        var blades = new BladeData[size * size];
+
+        for (int x = 0; x < size; x++)
+        for (int y = 0; y < size; y++) {
+            var i = x + y * size;
+            blades[i].rootPosition = new Vector3(x + 0.5f, 0.0f, y + 0.5f);
+            blades[i].tipPosition = blades[i].rootPosition + new Vector3(0.0f, 1.0f, 0.0f);
+        }
+
+        return blades;
+    }
+
+    private void CreateChunks(BladeData[] blades) {
+        GameObject chunks;
+        // If a child called "Chunks" exists, destroy it -> children are also destroyed
+        var chunksTransform = gameObject.transform.Find("Chunks");
+        if (chunksTransform != null) {
+            // Destroy(obj) does not work in edit mode
+            DestroyImmediate(chunksTransform.gameObject);
+        }
+        // create GameObject "Chunks" as a container for all GrassChunk objects
+        chunks = new GameObject("Chunks");
+        chunks.transform.SetParent(this.transform, false);
+
+        var chunkSize = ((float)size) / numChunks;
+        for (int x = 0; x < numChunks; x++)
+        for (int y = 0; y < numChunks; y++) {
+            var chunkPos = new Vector3(x, 0.0f, y) * chunkSize;
+            // bounds in local space of grass field
+            var bounds = new Bounds(
+                new Vector3(0.5f * chunkSize, 0.5f, 0.5f * chunkSize),
+                new Vector3(chunkSize, 1.01f, chunkSize)
+            );
+
+            List<Vector3> rootPositions = new();
+            List<Vector3> tipPositions = new();
+            List<int> indices = new();
+            foreach (var blade in blades) {
+                var localRootPos = blade.rootPosition - chunkPos;
+                if (bounds.Contains(localRootPos)) {
+                    rootPositions.Add(localRootPos);
+                    var localTipPos = blade.tipPosition - chunkPos;
+                    tipPositions.Add(localTipPos);
+                    indices.Add(rootPositions.Count - 1);
+                }
+            }
+
+            var mesh = new Mesh();
+            // 16 bit (default) supports 65536 vertices, 32 bit supports 4 billion
+            // mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
+            mesh.name = "grass_chunk[" + x + "," + y + "]";
+            mesh.SetVertices(rootPositions);
+            // do not calculate bounding box - will be set manually
+            mesh.SetIndices(indices, MeshTopology.Points, 0, false);
+            // Vector3 UVs are possible
+            mesh.SetUVs(0, tipPositions);
+
+            var chunk = Instantiate(chunkPrefab, chunks.transform);
+            chunk.name = "Chunk [" + x + ", " + y +"]";
+            chunk.transform.localPosition = chunkPos;
+
+            var meshFilter = chunk.GetComponent<MeshFilter>();
+            meshFilter.sharedMesh = mesh;
+
+            var meshRenderer = chunk.GetComponent<MeshRenderer>();
+            meshRenderer.localBounds = bounds;
+        }
+    }
+}

Assets/Scripts/GrassField.cs.meta

@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 29a97b88a66e0814b96ef80f3f643e1e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences:
+  - chunkPrefab: {fileID: 6414307754184109852, guid: abb47bb4e9622f7428302dfa4730d722, type: 3}
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Packages/manifest.json

@@ -5,6 +5,7 @@
     "com.unity.textmeshpro": "3.0.6",
     "com.unity.timeline": "1.7.6",
     "com.unity.toolchain.linux-x86_64": "2.0.9",
+    "com.unity.toolchain.win-x86_64-linux-x86_64": "2.0.9",
     "com.unity.ugui": "1.0.0",
     "com.unity.visualscripting": "1.9.4",
     "com.unity.modules.ai": "1.0.0",

Packages/packages-lock.json

@@ -142,6 +142,16 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.toolchain.win-x86_64-linux-x86_64": {
+      "version": "2.0.9",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "2.0.10",
+        "com.unity.sysroot.linux-x86_64": "2.0.9"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ugui": {
       "version": "1.0.0",
       "depth": 0,

ProjectSettings/SceneTemplateSettings.json

@@ -0,0 +1,121 @@
+{
+    "templatePinStates": [],
+    "dependencyTypeInfos": [
+        {
+            "userAdded": false,
+            "type": "UnityEngine.AnimationClip",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEditor.Animations.AnimatorController",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.AnimatorOverrideController",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEditor.Audio.AudioMixerController",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.ComputeShader",
+            "defaultInstantiationMode": 1
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Cubemap",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.GameObject",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEditor.LightingDataAsset",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.LightingSettings",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Material",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEditor.MonoScript",
+            "defaultInstantiationMode": 1
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.PhysicMaterial",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.PhysicsMaterial2D",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Rendering.PostProcessing.PostProcessProfile",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Rendering.PostProcessing.PostProcessResources",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Rendering.VolumeProfile",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEditor.SceneAsset",
+            "defaultInstantiationMode": 1
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Shader",
+            "defaultInstantiationMode": 1
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.ShaderVariantCollection",
+            "defaultInstantiationMode": 1
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Texture",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Texture2D",
+            "defaultInstantiationMode": 0
+        },
+        {
+            "userAdded": false,
+            "type": "UnityEngine.Timeline.TimelineAsset",
+            "defaultInstantiationMode": 0
+        }
+    ],
+    "defaultDependencyTypeInfo": {
+        "userAdded": false,
+        "type": "<default_scene_template_dependencies>",
+        "defaultInstantiationMode": 1
+    },
+    "newSceneOverride": 0
+}