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-rw-r--r--Scripts/GrassGridBlit.shader77
-rwxr-xr-xScripts/InstanceGrass.asset1265
-rwxr-xr-xScripts/InstanceGrass.cs343
-rwxr-xr-xScripts/InstanceGrass.cs.meta11
4 files changed, 1696 insertions, 0 deletions
diff --git a/Scripts/GrassGridBlit.shader b/Scripts/GrassGridBlit.shader
new file mode 100644
index 0000000..f4dc872
--- /dev/null
+++ b/Scripts/GrassGridBlit.shader
@@ -0,0 +1,77 @@
+Shader "yum_food/GrassGridBlit"
+{
+ Properties
+ {
+ }
+ SubShader
+ {
+ Tags { "RenderType"="Opaque" }
+ LOD 100
+
+ Pass
+ {
+ CGPROGRAM
+ #pragma vertex vert
+ #pragma fragment frag
+
+ #include "UnityCG.cginc"
+
+ struct appdata
+ {
+ float4 vertex : POSITION;
+ float2 uv : TEXCOORD0;
+ };
+
+ struct v2f
+ {
+ float2 uv : TEXCOORD0;
+ float4 vertex : SV_POSITION;
+ };
+
+ // Grid parameters
+ float3 _PlayerGridPos; // Player's grid cell position (x, y, z)
+ int3 _GridCount; // Number of instances along each axis
+ int3 _GridHalf; // Half dimensions for centering around player
+ int2 _TexDimensions; // Texture width and height
+
+ v2f vert (appdata v)
+ {
+ v2f o;
+ o.vertex = UnityObjectToClipPos(v.vertex);
+ o.uv = v.uv;
+ return o;
+ }
+
+ float4 frag (v2f i) : SV_Target
+ {
+ // Convert UV to pixel coordinates
+ int2 pixelCoord = int2(i.uv.x * _TexDimensions.x, i.uv.y * _TexDimensions.y);
+
+ // Convert pixel coordinate to instance index
+ int instanceID = pixelCoord.x + pixelCoord.y * _TexDimensions.x;
+
+ // Calculate total valid instances
+ int totalInstances = _GridCount.x * _GridCount.y * _GridCount.z;
+
+ // If this pixel is beyond valid instances, output invalid marker
+ if (instanceID >= totalInstances) {
+ return float4(0, 0, 0, -1); // Alpha = -1 marks invalid
+ }
+
+ // Convert instance index to local grid coordinates (0 to GridCount-1)
+ int localX = instanceID % _GridCount.x;
+ int localY = (instanceID / _GridCount.x) % _GridCount.y;
+ int localZ = instanceID / (_GridCount.x * _GridCount.y);
+
+ // Convert to world grid coordinates centered around player
+ int worldX = _PlayerGridPos.x - _GridHalf.x + localX;
+ int worldY = _PlayerGridPos.y - _GridHalf.y + localY;
+ int worldZ = _PlayerGridPos.z - _GridHalf.z + localZ;
+
+ // Store world grid coordinates in RGB channels, alpha = 0 marks valid
+ return float4(worldX, worldY, worldZ, 0);
+ }
+ ENDCG
+ }
+ }
+}
diff --git a/Scripts/InstanceGrass.asset b/Scripts/InstanceGrass.asset
new file mode 100755
index 0000000..3dd3bc4
--- /dev/null
+++ b/Scripts/InstanceGrass.asset
@@ -0,0 +1,1265 @@
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diff --git a/Scripts/InstanceGrass.cs b/Scripts/InstanceGrass.cs
new file mode 100755
index 0000000..3c0d8f6
--- /dev/null
+++ b/Scripts/InstanceGrass.cs
@@ -0,0 +1,343 @@
+using UdonSharp;
+using UnityEngine;
+using VRC.SDKBase;
+
+#if UNITY_EDITOR && !COMPILER_UDONSHARP
+using UnityEditor;
+using System.IO;
+#endif
+
+public class InstanceGrass : UdonSharpBehaviour
+{
+ [SerializeField] public GameObject prefab_;
+ // The density of instances, in instances per meter.
+ [SerializeField] public float density_;
+ // The extent along each cardinal axis where instances will be rendered, in
+ // meters. I.e. render inside a cube with edges this long.
+ [SerializeField] public Vector3 extent_meters_;
+ [SerializeField] public Vector3 angle_randomization_;
+ [SerializeField] public float scale_randomization_;
+
+ // GPU mode settings
+ [SerializeField] public Vector3Int max_grid_size_ = new Vector3Int(512, 1, 512); // Maximum grid dimensions for GPU mode
+ [SerializeField] public Material blit_material_; // Auto-generated in editor, set by custom editor
+
+ private Mesh mesh_;
+ private Material instance_material_; // Extracted from prefab
+ private Transform base_transform_;
+ private Vector3 cell_dim_;
+ private Vector3 inv_cell_dim_;
+ private Vector3Int count_;
+ private int total_instances_;
+ private bool initialized_;
+
+ // Track fields to detect runtime changes.
+ private float density_live_;
+ private Vector3 extent_meters_live_;
+ private Vector3 angle_randomization_live_;
+ private float scale_randomization_live_;
+
+ // GPU-specific resources
+ private RenderTexture instance_data_tex_;
+ private Matrix4x4[] identity_transforms_; // All identity matrices
+ private int tex_width_;
+ private int tex_height_;
+
+ private void Init() {
+ // Extract components from prefab.
+ if (prefab_ != null) {
+ MeshFilter mesh_filter = prefab_.GetComponent<MeshFilter>();
+ if (mesh_filter == null && prefab_.transform.childCount > 0) {
+ mesh_filter = prefab_.GetComponentInChildren<MeshFilter>();
+ }
+ if (mesh_filter != null) {
+ mesh_ = mesh_filter.sharedMesh;
+ if (mesh_ == null) {
+ mesh_ = mesh_filter.mesh;
+ }
+ } else {
+ Debug.LogError("[Grass::Debug] Could not find MeshFilter on prefab or children.");
+ }
+
+ MeshRenderer mesh_renderer = prefab_.GetComponent<MeshRenderer>();
+ if (mesh_renderer == null && prefab_.transform.childCount > 0) {
+ mesh_renderer = prefab_.GetComponentInChildren<MeshRenderer>();
+ }
+ if (mesh_renderer != null) {
+ Material[] materials = mesh_renderer.sharedMaterials;
+ if (materials != null && materials.Length > 0) {
+ instance_material_ = materials[0];
+ } else {
+ Debug.LogError("[Grass::Debug] MeshRenderer has no materials.");
+ }
+ } else {
+ Debug.LogError("[Grass::Debug] Could not find MeshRenderer on prefab.");
+ }
+
+ base_transform_ = prefab_.transform;
+ Debug.Log($"[Grass::Debug] Prefab transform - pos:{base_transform_.position}, rot:{base_transform_.rotation.eulerAngles}, scale:{base_transform_.localScale}");
+ } else {
+ Debug.LogError("[Grass::Debug] prefab is null in Init().");
+ }
+
+ density_ = Mathf.Max(1e-6f, density_);
+ extent_meters_ = Vector3.Max(Vector3.one * 1e-6f, extent_meters_);
+ angle_randomization_ = new Vector3(
+ Mathf.Clamp(angle_randomization_.x, 0f, 180f),
+ Mathf.Clamp(angle_randomization_.y, 0f, 180f),
+ Mathf.Clamp(angle_randomization_.z, 0f, 180f));
+
+ // Use max_grid_size_ directly for GPU mode
+ count_ = Vector3Int.Min(max_grid_size_, new Vector3Int(
+ Mathf.Max(1, Mathf.RoundToInt(density_ * extent_meters_.x)),
+ Mathf.Max(1, Mathf.RoundToInt(density_ * extent_meters_.y)),
+ Mathf.Max(1, Mathf.RoundToInt(density_ * extent_meters_.z))));
+
+ cell_dim_ = new Vector3(
+ extent_meters_.x / count_.x,
+ extent_meters_.y / count_.y,
+ extent_meters_.z / count_.z);
+ inv_cell_dim_ = new Vector3(
+ 1f / cell_dim_.x,
+ 1f / cell_dim_.y,
+ 1f / cell_dim_.z);
+
+ total_instances_ = count_.x * count_.y * count_.z;
+
+ // Calculate texture dimensions (power of 2, minimum 256x256)
+ int min_tex_size = Mathf.CeilToInt(Mathf.Sqrt(total_instances_));
+ tex_width_ = Mathf.Max(256, Mathf.NextPowerOfTwo(min_tex_size));
+ tex_height_ = tex_width_;
+
+ // Create instance data texture
+ if (instance_data_tex_ != null) {
+ instance_data_tex_.Release();
+ }
+ instance_data_tex_ = new RenderTexture(tex_width_, tex_height_, 0, RenderTextureFormat.ARGBFloat);
+ instance_data_tex_.filterMode = FilterMode.Point;
+ instance_data_tex_.Create();
+
+ // Create transform array with encoded instance IDs - must match actual draw count
+ int actual_draw_count = tex_width_ * tex_height_;
+ if (identity_transforms_ == null || identity_transforms_.Length != actual_draw_count) {
+ identity_transforms_ = new Matrix4x4[actual_draw_count];
+ for (int i = 0; i < actual_draw_count; i++) {
+ // Encode instance ID in the matrix translation component
+ // We'll put the ID in the X component, which the shader will read
+ Matrix4x4 m = Matrix4x4.identity;
+ m.m03 = i; // Store instance ID in translation.x
+ identity_transforms_[i] = m;
+ }
+ }
+
+ if (mesh_ != null) {
+ // Set huge bounds so culling doesn't interfere
+ mesh_.bounds = new Bounds(Vector3.zero, Vector3.one * 10000f);
+ }
+
+ density_live_ = density_;
+ extent_meters_live_ = extent_meters_;
+ angle_randomization_live_ = angle_randomization_;
+ scale_randomization_live_ = scale_randomization_;
+
+ Debug.Log($"[Grass::Debug] Init: density={density_}, extent={extent_meters_}, count={count_}, cell_dim={cell_dim_}, instances={total_instances_}, tex={tex_width_}x{tex_height_}, scale={base_transform_.localScale}, rot={base_transform_.localRotation.eulerAngles}");
+ Debug.Log($"[Grass::Debug] Init details: count_.x={count_.x}, count_.y={count_.y}, count_.z={count_.z}, extent.x={extent_meters_.x}, extent.z={extent_meters_.z}");
+ }
+
+ private bool Valid() {
+ if (prefab_ == null) {
+ Debug.LogError("[Grass::Debug] prefab is null.");
+ return false;
+ }
+ if (mesh_ == null) {
+ Debug.LogError("[Grass::Debug] mesh is null.");
+ return false;
+ }
+ if (instance_material_ == null) {
+ Debug.LogError("[Grass::Debug] instance_material is null.");
+ return false;
+ }
+ if (blit_material_ == null) {
+ Debug.LogError("[Grass::Debug] blit_material is null (failed to generate).");
+ return false;
+ }
+ if (instance_data_tex_ == null) {
+ Debug.LogError("[Grass::Debug] instance_data_tex is null.");
+ return false;
+ }
+ return true;
+ }
+
+ void Start() {
+ Init();
+ if (!Valid()) {
+ return;
+ }
+
+ initialized_ = true;
+ Debug.Log($"[Grass::Debug] GPU mode initialized");
+ }
+
+ void Update() {
+ // Reinitialize if any config changed at runtime.
+ if (density_ != density_live_ ||
+ extent_meters_ != extent_meters_live_ ||
+ angle_randomization_ != angle_randomization_live_ ||
+ scale_randomization_ != scale_randomization_live_) {
+ Init();
+ initialized_ = false;
+ }
+
+ if (!Valid()) {
+ return;
+ }
+
+ VRCPlayerApi lcl_player = Networking.LocalPlayer;
+ Vector3 player_pos = lcl_player.GetPosition();
+ int grid_x = Mathf.FloorToInt(player_pos.x * inv_cell_dim_.x);
+ int grid_y = Mathf.FloorToInt(player_pos.y * inv_cell_dim_.y);
+ int grid_z = Mathf.FloorToInt(player_pos.z * inv_cell_dim_.z);
+
+ int half_x = count_.x / 2;
+ int half_y = count_.y / 2;
+ int half_z = count_.z / 2;
+
+ // Update blit material properties
+ blit_material_.SetVector("_PlayerGridPos", new Vector3(grid_x, grid_y, grid_z));
+ blit_material_.SetVector("_GridCount", new Vector3(count_.x, count_.y, count_.z));
+ blit_material_.SetVector("_GridHalf", new Vector3(half_x, half_y, half_z));
+ blit_material_.SetVector("_TexDimensions", new Vector2(tex_width_, tex_height_));
+
+ // Blit to generate instance data texture
+ VRCGraphics.Blit(null, instance_data_tex_, blit_material_);
+
+ // Update instance material properties
+ instance_material_.SetTexture("_Instance_Texture_Offset_Data_Tex", instance_data_tex_);
+ instance_material_.SetVector("_Instance_Texture_Offset_Cell_Dimensions", cell_dim_);
+ instance_material_.SetVector("_Instance_Texture_Offset_Angle_Randomization", angle_randomization_);
+ instance_material_.SetFloat("_Instance_Texture_Offset_Scale_Randomization", scale_randomization_);
+ instance_material_.SetVector("_Instance_Texture_Offset_Base_Scale", base_transform_.localScale);
+
+ // Pass rotation as quaternion (x, y, z, w)
+ Quaternion rot = base_transform_.localRotation;
+ instance_material_.SetVector("_Instance_Texture_Offset_Base_Rotation", new Vector4(rot.x, rot.y, rot.z, rot.w));
+
+ if (Time.frameCount % 300 == 0) {
+ Debug.Log($"[Grass::Debug] Drawing {total_instances_} GPU instances");
+ Debug.Log($"[Grass::Debug] GridCount={count_}, TexDim={tex_width_}x{tex_height_}, CellDim={cell_dim_}");
+ }
+
+ // Draw instances with identity transforms - GPU handles everything
+ // Must draw tex_width * tex_height instances to match texture
+ VRCGraphics.DrawMeshInstanced(
+ mesh_,
+ 0,
+ instance_material_,
+ identity_transforms_,
+ total_instances_,
+ null,
+ UnityEngine.Rendering.ShadowCastingMode.Off,
+ true,
+ 0,
+ null,
+ UnityEngine.Rendering.LightProbeUsage.Off,
+ null);
+
+ initialized_ = true;
+ }
+
+ void OnDestroy() {
+ if (instance_data_tex_ != null) {
+ instance_data_tex_.Release();
+ }
+ }
+}
+
+#if UNITY_EDITOR && !COMPILER_UDONSHARP
+[CustomEditor(typeof(InstanceGrass))]
+public class InstanceGrassEditor : Editor
+{
+ public override void OnInspectorGUI()
+ {
+ DrawDefaultInspector();
+
+ InstanceGrass script = (InstanceGrass)target;
+
+ // Auto-generate blit material if missing
+ if (script.blit_material_ == null)
+ {
+ if (GUILayout.Button("Generate Blit Material"))
+ {
+ GenerateBlitMaterial(script);
+ }
+
+ EditorGUILayout.HelpBox("Blit material is missing. Click the button above to auto-generate it.", MessageType.Warning);
+ }
+ else
+ {
+ EditorGUILayout.HelpBox("Blit material is set. GPU instancing ready.", MessageType.Info);
+ }
+ }
+
+ private void GenerateBlitMaterial(InstanceGrass script)
+ {
+ Shader blitShader = Shader.Find("yum_food/GrassGridBlit");
+ if (blitShader == null)
+ {
+ EditorUtility.DisplayDialog("Error", "Could not find shader 'yum_food/GrassGridBlit'. Make sure GrassGridBlit.shader is imported.", "OK");
+ return;
+ }
+
+ string assetPath = "Assets/yum_food/3ner/Grass_Generated/Grass_generated.mat";
+
+ // Create or load existing material
+ Material blitMat = AssetDatabase.LoadAssetAtPath<Material>(assetPath);
+ if (blitMat == null)
+ {
+ // Create new material
+ blitMat = new Material(blitShader);
+ blitMat.name = "Grass_generated";
+
+ // Ensure directory exists
+ string directory = Path.GetDirectoryName(assetPath);
+ if (!Directory.Exists(directory))
+ {
+ Directory.CreateDirectory(directory);
+ }
+
+ AssetDatabase.CreateAsset(blitMat, assetPath);
+ Debug.Log($"[Grass::Editor] Created blit material at {assetPath}");
+ }
+ else
+ {
+ // Update existing material shader
+ blitMat.shader = blitShader;
+ EditorUtility.SetDirty(blitMat);
+ Debug.Log($"[Grass::Editor] Updated existing blit material at {assetPath}");
+ }
+
+ script.blit_material_ = blitMat;
+ EditorUtility.SetDirty(script);
+ AssetDatabase.SaveAssets();
+ }
+
+ [UnityEditor.Callbacks.DidReloadScripts]
+ private static void OnScriptsReloaded()
+ {
+ // Auto-generate blit material for all InstanceGrass components when scripts reload
+ InstanceGrass[] allGrass = FindObjectsOfType<InstanceGrass>();
+ foreach (var grass in allGrass)
+ {
+ if (grass.blit_material_ == null)
+ {
+ var editor = CreateEditor(grass) as InstanceGrassEditor;
+ if (editor != null)
+ {
+ editor.GenerateBlitMaterial(grass);
+ DestroyImmediate(editor);
+ }
+ }
+ }
+ }
+}
+#endif
diff --git a/Scripts/InstanceGrass.cs.meta b/Scripts/InstanceGrass.cs.meta
new file mode 100755
index 0000000..58e03e6
--- /dev/null
+++ b/Scripts/InstanceGrass.cs.meta
@@ -0,0 +1,11 @@
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+guid: 8dd03d28500e21640aad6c2650091d4c
+MonoImporter:
+ externalObjects: {}
+ serializedVersion: 2
+ defaultReferences: []
+ executionOrder: 0
+ icon: {instanceID: 0}
+ userData:
+ assetBundleName:
+ assetBundleVariant:
generated by cgit v1.2.3 (git 2.39.1) at 2026-06-01 18:40:06 +0000