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Smooth LOD transition setup (only color) + Material variants + more stuff lol

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This commit is contained in:
Timo Eberl 2024-10-03 00:43:14 +02:00
parent 794125696f
commit f5de2988d0
Signed by: Timo
SSH Key Fingerprint: SHA256:swVjhbVzKCLQZNtwPqMEmtOUG3FTydzVrpIKpUZYTQw
20 changed files with 225205 additions and 44573 deletions
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31
Assets/Materials/Grass LOD 0.mat Normal file
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@ -0,0 +1,31 @@
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2
Assets/Materials/GrassLOD2.mat.meta → Assets/Materials/Grass LOD 0.mat.meta
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31
Assets/Materials/Grass LOD 1.mat Normal file
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2
Assets/Materials/GrassLOD1.mat.meta → Assets/Materials/Grass LOD 1.mat.meta
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31
Assets/Materials/Grass LOD 2.mat Normal file
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8
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36
Assets/Materials/Grass.mat Normal file
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- _BladeWidth: 0.03
- _LOD: 0
m_Colors:
- _Color0: {r: 0.5882353, g: 1, b: 0.5882353, a: 1}
- _Color1: {r: 1, g: 0.8209069, b: 0.495283, a: 1}
- _Color2: {r: 1, g: 0.49831352, b: 0.21226418, a: 1}
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0
Assets/Materials/GrassLOD0.mat.meta → Assets/Materials/Grass.mat.meta
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72
Assets/Materials/GrassLOD0.mat
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m_Scale: {x: 1, y: 1}
m_Offset: {x: 0, y: 0}
m_Ints: []
m_Floats:
- _AOStrength: 1
- _BendStrength: 1
- _BladeBow: 0.3
- _BladeWidth: 0.0325
- _ExtraSawnOnCutGras: 6
- _FieldSize: 5
- _LOD: 0
- _Metallic: 0
- _NumSegments_LOD_0: 11
- _NumSegments_LOD_1: 5
- _NumSegments_LOD_2: 1
- _Roughness: 0.3
- _SSSStrength: 1
- _SegmentsMinusOne: 11
- _Translucency: 1
m_Colors:
- _BoxSize: {r: 0, g: 0, b: 0, a: 0}
- _BoxWorldCenter: {r: 0, g: 0, b: 0, a: 0}
- _Braun: {r: 0.33999997, g: 0.85, b: 0.92, a: 1}
- _Farbe: {r: 0.33999997, g: 0.85, b: 0.92, a: 1}
- _InnerColor: {r: 1, g: 1, b: 1, a: 1}
- _SpecularColor: {r: 1, g: 1, b: 1, a: 1}
- _WindOffset: {r: 0, g: 0, b: 0, a: 0}
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72
Assets/Materials/GrassLOD1.mat
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m_Scale: {x: 1, y: 1}
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m_Ints: []
m_Floats:
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- _BendStrength: 1
- _BladeBow: 0.3
- _BladeWidth: 0.0276
- _ExtraSawnOnCutGras: 6
- _FieldSize: 5
- _LOD: 1
- _Metallic: 0
- _NumSegments_LOD_0: 11
- _NumSegments_LOD_1: 3
- _NumSegments_LOD_2: 1
- _Roughness: 0.3
- _SSSStrength: 1
- _SegmentsMinusOne: 11
- _Translucency: 1
m_Colors:
- _BoxSize: {r: 0, g: 0, b: 0, a: 0}
- _BoxWorldCenter: {r: 0, g: 0, b: 0, a: 0}
- _Braun: {r: 0.33999997, g: 0.85, b: 0.92, a: 1}
- _Farbe: {r: 0.33999997, g: 0.85, b: 0.92, a: 1}
- _InnerColor: {r: 1, g: 1, b: 1, a: 1}
- _SpecularColor: {r: 1, g: 1, b: 1, a: 1}
- _WindOffset: {r: 0, g: 0, b: 0, a: 0}
m_BuildTextureStacks: []

72
Assets/Materials/GrassLOD2.mat
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m_Ints: []
m_Floats:
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- _BendStrength: 1
- _BladeBow: 0.3
- _BladeWidth: 0.047
- _ExtraSawnOnCutGras: 6
- _FieldSize: 5
- _LOD: 2
- _Metallic: 0
- _NumSegments_LOD_0: 11
- _NumSegments_LOD_1: 5
- _NumSegments_LOD_2: 1
- _Roughness: 0.3
- _SSSStrength: 1
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- _Translucency: 1
m_Colors:
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269240
Assets/Scenes/SampleScene.unity
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9
Assets/Scripts/Editor/Startup.cs Normal file
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@ -0,0 +1,9 @@
using UnityEngine;
using UnityEditor;
[InitializeOnLoad]
public class Startup {
static Startup() {
Shader.EnableKeyword("UNITY_EDITOR");
}
}

11
Assets/Scripts/Editor/Startup.cs.meta Normal file
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@ -0,0 +1,11 @@
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6
Assets/Scripts/GrassChunk.cs
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@ -1,7 +1,5 @@
using System;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Serialization;
[RequireComponent(typeof(MeshRenderer)), RequireComponent(typeof(MeshFilter))]
public class GrassChunk : MonoBehaviour {
@ -139,8 +137,8 @@ public class GrassChunk : MonoBehaviour {
}
}
private void OnDrawGizmos() {
Gizmos.color = new Color(1f, 0.7f, 0f, 0.5f);
private void OnDrawGizmosSelected() {
Gizmos.color = new Color(1f, 0.7f, 0f, 0.2f);
var meshRenderer = GetComponent<MeshRenderer>();
var bounds = meshRenderer.bounds;
Gizmos.DrawWireCube(bounds.center, bounds.size);

68
Assets/Scripts/GrassField.cs
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@ -4,7 +4,7 @@ using UnityEngine;
public class GrassField : MonoBehaviour {
public int size = 100;
public int numChunks = 5;
public int numChunks = 10;
public int bladesPerMeter = 100;
public GrassChunk chunkPrefab;
public bool ignoreHeightForLOD = true;
@ -13,15 +13,19 @@ public class GrassField : MonoBehaviour {
[Range(0f, 1f)] public float densityLOD0 = 1f;
public bool enableShadowsLOD0 = true;
[Header("LOD 1")]
public float distanceLOD1 = 7.5f;
public float distanceLOD1 = 5f;
public Material grassMaterialLOD1;
[Range(0f, 1f)] public float densityLOD1 = 0.5f;
public bool enableShadowsLOD1 = true;
[Header("LOD 2")]
public float distanceLOD2 = 7.5f + Mathf.Sqrt(2 * ((100f / 10f) * (100f / 10f))) + 5f;
public float distanceLOD2 = 5f + (100f / 10f) * SQRT_2 + 3f;
public Material grassMaterialLOD2;
[Range(0f, 1f)] public float densityLOD2 = 0.2f;
public bool enableShadowsLOD2 = false;
private const float SQRT_2 = 1.4142135623730f;
private static readonly int pId_WorldSpaceCameraPosEditor = Shader.PropertyToID("_WorldSpaceCameraPosEditor");
private static readonly int pId_TransitionRange = Shader.PropertyToID("_TransitionRange");
// a 2D array would be cleaner, but it can't be serialized
// serialize it, because the chunks are generated offline and used during runtime
@ -30,8 +34,9 @@ public class GrassField : MonoBehaviour {
// ReSharper disable Unity.PerformanceAnalysis
public void GenerateGrassField() {
Debug.Log("Generating grass field... ");
var bladesLOD0 = GrassMeshGeneration.GenerateBladesRandom(size, size * size * (int)(bladesPerMeter * densityLOD0));
var bladesLOD0 = GrassMeshGeneration.GenerateBladesRandom(
size, size * size * (int)(bladesPerMeter * densityLOD0)
);
// var bladesLOD1 = GenerateBladesRandom(size, size * size * (int)(bladesPerMeter * densityLOD1));
// var bladesLOD2 = GenerateBladesRandom(size, size * size * (int)(bladesPerMeter * densityLOD2));
var bladesLOD1 = GrassMeshGeneration.GenerateBladesReduced(bladesLOD0, densityLOD1);
@ -42,7 +47,8 @@ public class GrassField : MonoBehaviour {
}
private void OnEnable() {
var minDistLOD2 = distanceLOD1 + Mathf.Sqrt( 2 * Mathf.Pow( (float)size / numChunks, 2f ) );
var chunkSize = ((float)size) / numChunks;
var minDistLOD2 = distanceLOD1 + chunkSize * SQRT_2;
if (distanceLOD2 < minDistLOD2) {
Debug.LogWarning("It is recommended that minDistLOD2 is greater than " + minDistLOD2 + ".");
}
@ -53,17 +59,31 @@ public class GrassField : MonoBehaviour {
}
}
private void Update() {
UpdateLODs(false);
private void OnDisable() {
var camPosWorld = Camera.main ? Camera.main.transform.position : Vector3.zero;
UpdateMaterials(camPosWorld);
UpdateLODs(camPosWorld);
}
private void UpdateLODs(bool forceCompleteCheck = true) {
private void OnValidate() {
var camPosWorld = Camera.main ? Camera.main.transform.position : Vector3.zero;
UpdateMaterials(camPosWorld);
}
private void Update() {
var cam = Camera.main;
if (!cam) return;
var camPosWorld = cam.transform.position;
#if UNITY_EDITOR
UpdateMaterials(camPosWorld);
#endif
if (_chunks.Length != numChunks * numChunks) return;
UpdateLODs(camPosWorld, false); // while the game is running, only the chunks near the camera are updated
}
var camPos = cam.transform.position - transform.position; // cam position relative to grass field
private void UpdateLODs(Vector3 camPosWorld, bool forceCompleteCheck = true) {
var camPos = camPosWorld - transform.position; // cam position relative to grass field
if (ignoreHeightForLOD) {
camPos.y = 0;
}
@ -125,6 +145,26 @@ public class GrassField : MonoBehaviour {
return range;
}
private void UpdateMaterials(Vector3 camPosWorld) {
var chunkSize = ((float)size) / numChunks;
var chunkDiagonalLength = chunkSize * SQRT_2;
var transition0From = 0f;
var transition0To = distanceLOD1;
var transition1From = transition0To + chunkDiagonalLength;
var transition1To = distanceLOD2;
grassMaterialLOD0.SetVector(pId_TransitionRange, new Vector2(transition0From, transition0To));
grassMaterialLOD1.SetVector(pId_TransitionRange, new Vector2(transition1From, transition1To));
#if UNITY_EDITOR
if (ignoreHeightForLOD) {
camPosWorld.y = 0;
}
grassMaterialLOD0.SetVector(pId_WorldSpaceCameraPosEditor, camPosWorld);
grassMaterialLOD1.SetVector(pId_WorldSpaceCameraPosEditor, camPosWorld);
grassMaterialLOD2.SetVector(pId_WorldSpaceCameraPosEditor, camPosWorld);
#endif
}
private void CreateChunks(BladeData[] bladesLOD0, BladeData[] bladesLOD1, BladeData[] bladesLOD2) {
GameObject chunksContainer;
// If a child called "Chunks" exists, destroy it -> children are also destroyed
@ -169,7 +209,9 @@ public class GrassField : MonoBehaviour {
_chunks[x + y * numChunks] = chunk;
}
UpdateLODs();
var camPosWorld = Camera.main ? Camera.main.transform.position : Vector3.zero;
UpdateLODs(camPosWorld);
UpdateMaterials(camPosWorld);
}
private Mesh GenerateChunkMesh(Vector3 chunkPos, Bounds chunkBounds, BladeData[] blades, string meshName) {
@ -237,12 +279,12 @@ public class GrassField : MonoBehaviour {
Gizmos.matrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, new Vector3(1f, 0.001f, 1f));
}
Gizmos.color = new Color(1.0f, 0.0f, 1.0f, 1f);
Gizmos.color = new Color(0f, 0.3f, 1f, 1f);
Gizmos.DrawWireSphere(center, distanceLOD1);
Gizmos.DrawWireSphere(center, distanceLOD2);
Gizmos.color = new Color(1.0f, 1.0f, 0.0f, 1f);
var minDistLOD2 = distanceLOD1 + Mathf.Sqrt( 2 * Mathf.Pow( (float)size / numChunks, 2f ) );
var minDistLOD2 = distanceLOD1 + chunkSize * SQRT_2;
Gizmos.DrawWireSphere(center, minDistLOD2);
Gizmos.matrix = oldMatrix;

8
Assets/Shaders/GrassBlade.shader
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@ -1,8 +1,12 @@
Shader "Grass/GrassBlade" {
Properties {
[KeywordEnum(LOD 0, LOD 1, LOD 2)] _LOD("Level of Detail", int) = 0
_BladeWidth("Breite", Range(0.003, .1)) = 0.01
_BladeWidth("Blade Width", Range(0.003, .1)) = 0.01
_BendStrength("Bend Strength", Range(0, 1)) = 1
_Color0("Color LOD 0", Color) = (0.3, 1.0, 0.3, 1.0)
_Color1("Color LOD 1", Color) = (1.0, 0.7, 0.3, 1.0)
_Color2("Color LOD 2", Color) = (1.0, 0.3, 0.1, 1.0)
}
SubShader {
LOD 100
@ -19,6 +23,7 @@
#pragma multi_compile _ SHADOWS_SCREEN
// shader_feature is very similar to multi_compile. Use multi_compile for keywords that are set from code.
#pragma shader_feature _LOD_LOD_0 _LOD_LOD_1 _LOD_LOD_2
#pragma shader_feature UNITY_EDITOR
#include "UnityCG.cginc"
#include "UnityPBSLighting.cginc"
@ -45,6 +50,7 @@
#pragma geometry geom
#pragma shader_feature _LOD_LOD_0 _LOD_LOD_1 _LOD_LOD_2
#pragma shader_feature UNITY_EDITOR
#include "UnityCG.cginc"

61
Assets/Shaders/include/GrassBladePass.hlsl
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@ -1,5 +1,12 @@
// Material Properties
float _BladeWidth, _BendStrength;
int _NumSegments_LOD_0, _NumSegments_LOD_1, _NumSegments_LOD_2;
float4 _Color0, _Color1, _Color2;
float2 _TransitionRange;
#if UNITY_EDITOR
float3 _WorldSpaceCameraPosEditor;
#endif
struct MeshData {
float4 vertex : POSITION;
@ -15,6 +22,7 @@ struct g2f {
#ifdef IS_IN_BASE_PASS
float2 uv : TEXCOORD0; // bottom left 0.0 top right 1.1 (values converge - 0 and 1 meet at the tip)
SHADOW_COORDS(1) // put shadows data into TEXCOORD1
float3 worldPos : TEXCOORD2;
#endif
};
@ -25,7 +33,13 @@ v2g vert (MeshData v) {
return o;
}
const int ns = 11;
float getCameraDistance(float3 pos) {
#if UNITY_EDITOR
return distance(_WorldSpaceCameraPosEditor, pos);
#else
return distance(_WorldSpaceCameraPos, pos);
#endif
}
#if _LOD_LOD_0
[MaxVertexCount(4 + ( 11 - 1 ) * 2)]
@ -44,7 +58,8 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
// if (!isInFrustum(basePosClipSpace, 0.1) && !isInFrustum(tipPosClipSpace, 0.1)) return;
const float3 basePosWS = mul(unity_ObjectToWorld, float4(basePos.xyz, 1.0)).xyz;
const float cameraDistance = distance(_WorldSpaceCameraPos, basePosWS);
const float cameraDistance = getCameraDistance(basePosWS);
// randomly cull grass blades
// float randoVal = N21(basePos);
@ -88,30 +103,34 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
const float3 vertRightTip = segmentCenterTip - widthOffset * 0.4;
o.pos = UnityObjectToClipPos(vertLeftBase);
#ifdef IS_IN_BASE_PASS
#ifdef IS_IN_BASE_PASS
o.uv = float2(0, 0);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
o.pos = UnityObjectToClipPos(vertRightBase);
#ifdef IS_IN_BASE_PASS
#ifdef IS_IN_BASE_PASS
o.uv = float2(1, 0);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
o.pos = UnityObjectToClipPos(vertLeftTip);
#ifdef IS_IN_BASE_PASS
#ifdef IS_IN_BASE_PASS
o.uv = float2(0, 1);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
o.pos = UnityObjectToClipPos(vertRightTip);
#ifdef IS_IN_BASE_PASS
#ifdef IS_IN_BASE_PASS
o.uv = float2(1, 1);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
}
@ -139,7 +158,11 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
const float3 normal = normalize(cross(surfTangent1, surfTangent2)); // TODO remove normalize
float3 normalWS = UnityObjectToWorldNormal(normal);
#if UNITY_EDITOR
const float3 camVec = normalize(segmentCenter - _WorldSpaceCameraPosEditor.xyz);
#else
const float3 camVec = normalize(segmentCenter - _WorldSpaceCameraPos.xyz);
#endif
// at which side of the blade are we looking?
const bool lookingFromAbove = dot(camVec, normalWS) > 0;
@ -151,6 +174,7 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
#ifdef IS_IN_BASE_PASS
o.uv = float2(0, segmentHeightNormalized);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
@ -158,6 +182,7 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
#ifdef IS_IN_BASE_PASS
o.uv = float2(1, segmentHeightNormalized);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
@ -168,17 +193,17 @@ void geom(point v2g IN[1], inout TriangleStream<g2f> triStream) {
#ifdef IS_IN_BASE_PASS
o.uv = float2(.5, 1);
TRANSFER_SHADOW(o)
o.worldPos = mul(unity_ObjectToWorld, float4(basePos, 1.0));
#endif
triStream.Append(o);
}
fixed4 frag(g2f i) : SV_Target{
float4 frag(g2f i) : SV_Target{
#ifdef IS_IN_SHADOW_PASS
return 0;
#else
float atten = 1.0;
const fixed shadow = SHADOW_ATTENUATION(i);
const float shadow = SHADOW_ATTENUATION(i);
float3 light = float3(i.uv.yyy);
light *= max(.35, shadow);
@ -186,16 +211,20 @@ fixed4 frag(g2f i) : SV_Target{
light *= 0.75;
#endif
const float camDist = getCameraDistance(i.worldPos);
float interpolator = invLerp(_TransitionRange.x, _TransitionRange.y, camDist);
float3 albedo;
#if _LOD_LOD_0
float3 albedo = float3(0.3,1.0,0.3);
albedo = lerp(_Color0.xyz, _Color1.xyz, interpolator);
#elif _LOD_LOD_1
float3 albedo = float3(1.0,0.7,0.3);
albedo = float3(0.3,1.0,0.3);
albedo = lerp(_Color1.xyz, _Color2.xyz, interpolator);
#elif _LOD_LOD_2
float3 albedo = float3(1.0,0.3,0.1);
albedo = float3(0.3,1.0,0.3);
albedo = _Color2.xyz;
#endif
// albedo = _Color0.xyz;
return float4(light * albedo, 1);
#endif
}

6
ProjectSettings/ProjectSettings.asset
View File

@ -301,7 +301,11 @@ PlayerSettings:
- m_BuildTarget: WebGL
m_StaticBatching: 0
m_DynamicBatching: 0
m_BuildTargetShaderSettings: []
m_BuildTargetShaderSettings:
- m_BuildTarget: Standalone
m_ChunkSizeInMB: 16
m_MaxChunks: 0
m_OverrideDefaultSettings: 0
m_BuildTargetGraphicsJobs:
- m_BuildTarget: MacStandaloneSupport
m_GraphicsJobs: 0

12
README.md
View File

@ -1,3 +1,15 @@
# Grass Rendering Prototype
Optimized rendering of huge grass fields.
## To-Do
- [x] LODs: reduced detail (number of vertices)
- [x] LODs: reduced number of blades
- [ ] Smooth LOD transition: number of blades
- [ ] Smooth LOD transition: detail
- [ ] Thicker blades with increased distance
- [ ] Cut map
- [ ] Cut map LOD versions
- [ ] Lighting
- [ ] Grass field generation: spawn in patches