unity 一万个量具有相同动画的物体渲染

先显示效果，帧率在70左右
性能分析
大量具有相同动画的物体，首先想到的是GPU Instancing
- 首先Skin Mesh合并，一个物体下面的所有mesh合并，并且共用一个材质球。（这一步目前没做）
- 设置一个结构体，这个结构体里面有物体的位置和角度信息。通过job system，转换为本地2世界坐标矩阵
- 得到物体每帧动画的mesh，然后用GPU Instancing大批量渲染这些mesh。
C#代码
调用代码，渲染一万个物体
shader代码

首先说明本人机器CPU是 i5-7400，GPU是GTX 1060 3G。模型三角面大约2K，分辨率1080P。

先显示效果，帧率在70左右

性能分析

渲染阴影大约用时2ms

渲染物体大约用时2.3ms

渲染一万个物体 cpu一共耗时2.3ms

BaseRenderStruct[] baseRenderStructs = new BaseRenderStruct[10000];
for (int i = 0; i < 100; i++)
{for (int j = 0; j < 100; j++){baseRenderStructs[i*100+j].position = new War.Vector2(j,i);baseRenderStructs[i*100+j].rotation = j * 36;}}Observable.EveryUpdate().Subscribe(_ =>{Profiler.BeginSample("CharacterRender");m_renderManger.DrawCharacterInstanced(baseRenderStructs);Profiler.EndSample();});

大量具有相同动画的物体，首先想到的是GPU Instancing

物体具有动画和Skinned Mesh，而且mesh不只有一个。物体可以投射阴影和接受阴影。思想如下：

首先Skin Mesh合并，一个物体下面的所有mesh合并，并且共用一个材质球。（这一步目前没做）

链接: SkinMesh合并

设置一个结构体，这个结构体里面有物体的位置和角度信息。通过job system，转换为本地2世界坐标矩阵

public struct BaseRenderStruct
{public Vector2 position;public float rotation;
}public struct MyParallelJob : IJobParallelFor
{[ReadOnly]public NativeArray<BaseRenderStruct> datas;[ReadOnly] public Matrix4x4 selfRotation;public NativeArray<Matrix4x4> result;public void Execute(int i){Matrix4x4 mat = Matrix4x4.identity;mat.m03 = (float) datas[i].position.x;mat.m13 = 0.0f;mat.m23 = (float) datas[i].position.y;result[i] = mat * Matrix4x4.Rotate(Quaternion.Euler(0, datas[i].rotation - 90, 0)) * selfRotation;}
}

得到物体每帧动画的mesh，然后用GPU Instancing大批量渲染这些mesh。

这里主要使用skinnedMeshRenderers.BakeMesh的方法烘培一个Mesh。
然后用Graphics.DrawMesh绘制大量Mesh。

C#代码

// 渲染结构体
public struct BaseRenderStruct
{public Vector2 position;public float rotation;
}public class Player3DCharacterRender
{private List<SkinnedMeshRenderer> m_skinnedMeshRenderers;private List<Mesh> m_animedMeshs;private int m_CurFrameCount = -1;private float m_StartTime;private Animator m_Animator;private GameObject m_go;private AnimationClip m_clip;private Matrix4x4 m_selfRotation;MyParallelJob myParallelJob;public void Init(GameObject go){m_go = go;m_StartTime = Time.time;m_skinnedMeshRenderers = new List<SkinnedMeshRenderer>();m_animedMeshs = new List<Mesh>();m_Animator = m_go.GetComponent<Animator>();m_selfRotation = Matrix4x4.Rotate(Quaternion.Euler(-90, 0, 0));SkinnedMeshRenderer[] skinnedMeshRenderers = m_go.GetComponentsInChildren<SkinnedMeshRenderer>();foreach (var skinnedMeshRenderer in skinnedMeshRenderers){m_skinnedMeshRenderers.Add(skinnedMeshRenderer);m_animedMeshs.Add(new Mesh());}foreach (var clip in m_Animator.runtimeAnimatorController.animationClips){if (clip.name.Equals("run(WeaponOneHand)")){m_clip = clip;break;}}myParallelJob = new MyParallelJob();myParallelJob.selfRotation = m_selfRotation;}public void Render(BaseRenderStruct data){if(m_go == null)return;if(m_CurFrameCount != Time.frameCount)BakeMesh();MaterialPropertyBlock properties = new MaterialPropertyBlock();Matrix4x4 m;CalculateWorldMatAndPlayIndex(data, out m);for (int i = 0; i < m_animedMeshs.Count; i++){Graphics.DrawMesh(m_animedMeshs[i] ,m,m_skinnedMeshRenderers[i].sharedMaterial,0,Camera.main,0,properties,ShadowCastingMode.On);}}public void Render(BaseRenderStruct[] data){if(m_go == null)return;if(m_CurFrameCount != Time.frameCount)BakeMesh();int group = data.Length / 1000;group += data.Length % 1000 > 0 ? 1 : 0;MaterialPropertyBlock properties = new MaterialPropertyBlock();/*for(int i = 0;i<data.Length;i++)CalculateWorldMatAndPlayIndex(data[i], out m[i]);*/myParallelJob.datas = new NativeArray<BaseRenderStruct>(data.Length, Allocator.TempJob);myParallelJob.datas.CopyFrom(data);NativeArray<Matrix4x4> result = new NativeArray<Matrix4x4>(data.Length, Allocator.TempJob);myParallelJob.result = result;JobHandle handle = myParallelJob.Schedule(data.Length, 1);handle.Complete();Matrix4x4[] m = result.ToArray();Matrix4x4[] subM = new Matrix4x4[1000];for (int n = 0; n < group; n++){int count = data.Length - n * 1000;count = count > 1000 ? 1000 : count;Array.Copy(m, n * 1000, subM, 0, count);for (int i = 0; i < m_animedMeshs.Count; i++){Graphics.DrawMeshInstanced(m_animedMeshs[i] ,0,m_skinnedMeshRenderers[i].sharedMaterial,subM,count,properties);}}myParallelJob.datas.Dispose();result.Dispose();}void CalculateWorldMatAndPlayIndex(BaseRenderStruct data ,out Matrix4x4 mat){mat = Matrix4x4.identity;mat.m03 = (float) data.position.x;mat.m13 = 0.0f;mat.m23 = (float) data.position.y;mat =  mat*Matrix4x4.Rotate(Quaternion.Euler(0,data.rotation - 90,0))*m_selfRotation;}public struct MyParallelJob : IJobParallelFor{[ReadOnly]public NativeArray<BaseRenderStruct> datas;[ReadOnly] public Matrix4x4 selfRotation;public NativeArray<Matrix4x4> result;public void Execute(int i){Matrix4x4 mat = Matrix4x4.identity;mat.m03 = (float) datas[i].position.x;mat.m13 = 0.0f;mat.m23 = (float) datas[i].position.y;result[i] = mat * Matrix4x4.Rotate(Quaternion.Euler(0, datas[i].rotation - 90, 0)) * selfRotation;}}void BakeMesh(){m_CurFrameCount = Time.frameCount;float time = (Time.time - m_StartTime) % m_clip.length;m_clip.SampleAnimation(m_go, time);for (int i = 0; i < m_skinnedMeshRenderers.Count; i++){m_animedMeshs[i].Clear();m_skinnedMeshRenderers[i].BakeMesh(m_animedMeshs[i]);}}
}

调用代码，渲染一万个物体

// A code block
BaseRenderStruct[] baseRenderStructs = new BaseRenderStruct[10000];
for (int i = 0; i < 100; i++)
{for (int j = 0; j < 100; j++){baseRenderStructs[i*100+j].position = new War.Vector2(j,i);baseRenderStructs[i*100+j].rotation = j * 36;}}Observable.EveryUpdate().Subscribe(_ =>{Profiler.BeginSample("CharacterRender");m_renderManger.DrawCharacterInstanced(baseRenderStructs);Profiler.EndSample();});

shader代码

Shader "Unlit/CharacterDefault"
{Properties{_BaseMap ("Base Texture",2D) = "white"{}_BaseColor("Base Color",Color)=(1,1,1,1)[Toggle]_IsSpecular("是否开启高光", Float) = 1}SubShader{Tags{"RenderPipeline"="UniversalPipeline""Queue"="Geometry""RenderType"="Opaque"}HLSLINCLUDE#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/UnityInstancing.hlsl"CBUFFER_START(UnityPerMaterial)float4 _BaseMap_ST;half4 _BaseColor;half _IsSpecular;CBUFFER_ENDENDHLSLPass{Tags{"LightMode"="UniversalForward"}HLSLPROGRAM //CGPROGRAM#pragma vertex vert#pragma fragment frag#pragma multi_compile_instancing#pragma multi_compile _ _MAIN_LIGHT_SHADOWS#pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADEstruct Attributes{float4 positionOS : POSITION;float4 normalOS : NORMAL;float2 uv : TEXCOORD;UNITY_VERTEX_INPUT_INSTANCE_ID};struct Varings//这就是v2f{float4 positionCS : SV_POSITION;float2 uv : TEXCOORD;float3 positionWS : TEXCOORD1;float3 viewDirWS : TEXCOORD2;float3 normalWS : TEXCOORD3;UNITY_VERTEX_INPUT_INSTANCE_ID};TEXTURE2D(_BaseMap);SAMPLER(sampler_BaseMap);Varings vert(Attributes IN){Varings OUT;UNITY_SETUP_INSTANCE_ID(IN);UNITY_TRANSFER_INSTANCE_ID(IN, OUT);VertexPositionInputs positionInputs = GetVertexPositionInputs(IN.positionOS.xyz);VertexNormalInputs normalInputs = GetVertexNormalInputs(IN.normalOS.xyz);OUT.positionCS = positionInputs.positionCS;OUT.uv=TRANSFORM_TEX(IN.uv,_BaseMap);OUT.positionWS = positionInputs.positionWS;OUT.viewDirWS = GetCameraPositionWS() - positionInputs.positionWS;OUT.normalWS = normalInputs.normalWS;return OUT;}float4 frag(Varings IN):SV_Target{UNITY_SETUP_INSTANCE_ID(IN);half4 baseMap = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, IN.uv);float4 SHADOW_COORDS = TransformWorldToShadowCoord(IN.positionWS);Light light = GetMainLight(SHADOW_COORDS);half3 n = normalize(IN.normalWS);half3 v = normalize(IN.viewDirWS);half3 h = normalize(light.direction + v);half nl = max(0.0,dot(light.direction ,n));half nh = max(0.0,dot(h ,n));half atten = step(0.5, light.shadowAttenuation);half3 diffuse = atten * lerp(0.5*baseMap.xyz ,baseMap.xyz ,nl) + (1 - atten) * 0.4 * baseMap.xyz * light.color ;half3 specular = _IsSpecular * atten * light.color * step(0.8,pow(nh ,8));uint pixelLightCount = GetAdditionalLightsCount();for (uint lightIndex = 0; lightIndex < pixelLightCount; ++lightIndex){Light add_light = GetAdditionalLight(lightIndex, IN.positionWS);half3 add_h = normalize(add_light.direction + v);half add_nl = max(0.0,dot(add_light.direction ,n));half add_nh = max(0.0,dot(add_h ,n));diffuse += baseMap.xyz * add_nl* add_light.color * add_light.distanceAttenuation;specular += _IsSpecular * add_light.color * add_light.distanceAttenuation * step(0.8,pow(add_nh ,8));}half3 color=diffuse*_BaseColor.xyz;return half4(color ,1.0);}ENDHLSL  //ENDCG          }pass {Tags{ "LightMode" = "ShadowCaster" }HLSLPROGRAM#pragma vertex vert#pragma fragment frag#pragma multi_compile_instancingstruct Attributes{float4 vertex : POSITION;UNITY_VERTEX_INPUT_INSTANCE_ID};struct Varings{float4 pos : SV_POSITION;UNITY_VERTEX_INPUT_INSTANCE_ID};sampler2D _MainTex;float4 _MainTex_ST;Varings vert(Attributes v){Varings o = (Varings)0;UNITY_SETUP_INSTANCE_ID(v);UNITY_TRANSFER_INSTANCE_ID(v, o);o.pos = mul(UNITY_MATRIX_MVP,v.vertex);return o;}float4 frag(Varings i) : SV_Target{UNITY_SETUP_INSTANCE_ID(i);return half4(0.0,0.0,0.0,1.0);}ENDHLSL}}
}

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unity 一万个具有相同动画的物体渲染

unity 一万个量具有相同动画的物体渲染

先显示效果，帧率在70左右

性能分析

大量具有相同动画的物体，首先想到的是GPU Instancing

首先Skin Mesh合并，一个物体下面的所有mesh合并，并且共用一个材质球。（这一步目前没做）

设置一个结构体，这个结构体里面有物体的位置和角度信息。通过job system，转换为本地2世界坐标矩阵

得到物体每帧动画的mesh，然后用GPU Instancing大批量渲染这些mesh。

C#代码

调用代码，渲染一万个物体

shader代码

unity 一万个具有相同动画的物体渲染相关推荐

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