标签:地址 start off array CM tpi cts iss material
https://blog.csdn.net/dardgen2015/article/details/51517860
很多时候我们需要把具有相同shader的材质球合并,从而减少drawcall的产生。
比如九龙战里面,一个人物带有10个部位,10个部位各自来自不同的fbx文件,加上身体,就有11个材质球,占上11个drawcall。如果主城里面跑着10个角色,光人物就占了110个drawcall!所以这种时候材质球合并是必须的。
(下图为九龙战里面的多部位换装效果)
材质球合并,分以下几步走,首先我们讨论普通的MeshRenderer的材质球合并,然后再讨论SkinnedMeshRenderer的材质球合并。
普通的MeshRenderer的材质球合并:
1.合并所有材质球所携带的贴图,新建一个材质球,并把合并好的贴图赋予新的材质球。
2.记录下每个被合并的贴图所处于新贴图的Rect,用一个Rect[]数组存下来。
3.合并网格,并把需要合并的各个网格的uv,根据第2步得到的Rect[]刷一遍。
4.把新的材质球赋予合并好的网格,此时就只占有1个drawcall了。
下面是关键代码:
- void CombineMesh()
- {
-
- MeshFilter[] mfChildren = GetComponentsInChildren<MeshFilter>();
- CombineInstance[] combine = new CombineInstance[mfChildren.Length];
-
-
- MeshRenderer[] mrChildren = GetComponentsInChildren<MeshRenderer>();
- Material[] materials = new Material[mrChildren.Length];
-
-
- MeshRenderer mrSelf = gameObject.AddComponent<MeshRenderer>();
- MeshFilter mfSelf = gameObject.AddComponent<MeshFilter>();
-
-
- Texture2D[] textures = new Texture2D[mrChildren.Length];
- for (int i = 0; i < mrChildren.Length; i++)
- {
- if (mrChildren[i].transform == transform)
- {
- continue;
- }
- materials[i] = mrChildren[i].sharedMaterial;
- Texture2D tx = materials[i].GetTexture("_MainTex") as Texture2D;
-
-
- Texture2D tx2D = new Texture2D(tx.width, tx.height, TextureFormat.ARGB32, false);
- tx2D.SetPixels(tx.GetPixels(0, 0, tx.width, tx.height));
- tx2D.Apply();
- textures[i] = tx2D;
- }
-
-
- Material materialNew = new Material(materials[0].shader);
- materialNew.CopyPropertiesFromMaterial(materials[0]);
- mrSelf.sharedMaterial = materialNew;
-
-
- Texture2D texture = new Texture2D(1024, 1024);
- materialNew.SetTexture("_MainTex", texture);
- Rect[] rects = texture.PackTextures(textures, 10, 1024);
-
-
- for (int i = 0; i < mfChildren.Length; i++)
- {
- if (mfChildren[i].transform == transform)
- {
- continue;
- }
- Rect rect = rects[i];
-
-
- Mesh meshCombine = mfChildren[i].mesh;
- Vector2[] uvs = new Vector2[meshCombine.uv.Length];
-
- for (int j = 0; j < uvs.Length; j++)
- {
- uvs[j].x = rect.x + meshCombine.uv[j].x * rect.width;
- uvs[j].y = rect.y + meshCombine.uv[j].y * rect.height;
- }
- meshCombine.uv = uvs;
- combine[i].mesh = meshCombine;
- combine[i].transform = mfChildren[i].transform.localToWorldMatrix;
- mfChildren[i].gameObject.SetActive(false);
- }
-
-
- Mesh newMesh = new Mesh();
- newMesh.CombineMeshes(combine, true,true);
- mfSelf.mesh = newMesh;
- }
合并前的drawcall:
合并后的drawcall:
合并好的网格:
合并好的贴图:
下面我们将讨论SkinnedMeshRenderer的合并。
SkinnedMeshRenderer比MeshRenderer稍微麻烦一点,因为SkinnedMeshRenderer要处理bones。
以下是步骤:
1.合并所有材质球所携带的贴图,新建一个材质球,并把合并好的贴图赋予新的材质球。
2.记录下每个被合并的贴图所处于新贴图的Rect,用一个Rect[]数组存下来。
3.记录下需要合并的SkinnedMeshRenderer的bones。
4.合并网格,并把需要合并的各个网格的uv,根据第2步得到的Rect[]刷一遍。
5.把合并好的网格赋予新的SkinnedMeshRenderer,并把第3步记录下的bones赋予新的SkinnedMeshRenderer。
6.把新的材质球赋予合并好的网格,此时就只占有1个drawcall了。
上面红色部分的步骤就是与MeshRenderer不同之处。
下面是关键代码:
- void CombineMesh()
- {
- SkinnedMeshRenderer[] smrs = GetComponentsInChildren<SkinnedMeshRenderer>();
- CombineInstance[] combine = new CombineInstance[smrs.Length];
- Material[] materials = new Material[smrs.Length];
- Texture2D[] textures = new Texture2D[smrs.Length];
-
- SkinnedMeshRenderer smrCombine = combineMesh.gameObject.AddComponent<SkinnedMeshRenderer>();
- smrCombine.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
- smrCombine.receiveShadows = false;
-
- for (int i = 0; i < smrs.Length; i++)
- {
- materials[i] = smrs[i].sharedMaterial;
- Texture2D tx = materials[i].GetTexture("_MainTex") as Texture2D;
-
- Texture2D tx2D = new Texture2D(tx.width, tx.height, TextureFormat.ARGB32, false);
- tx2D.SetPixels(tx.GetPixels(0, 0, tx.width, tx.height));
- tx2D.Apply();
- textures[i] = tx2D;
- }
-
- Material materialNew = new Material(materials[0].shader);
- materialNew.CopyPropertiesFromMaterial(materials[0]);
-
- Texture2D texture = new Texture2D(1024, 1024);
- Rect[] rects = texture.PackTextures(textures, 10, 1024);
- materialNew.SetTexture("_MainTex", texture);
-
- List<Transform> boneTmp = new List<Transform>();
-
- for (int i = 0; i < smrs.Length; i++)
- {
- if (smrs[i].transform == transform)
- {
- continue;
- }
- Rect rect = rects[i];
-
- Mesh meshCombine = CreatMeshWithMesh(smrs[i].sharedMesh);
- Vector2[] uvs = new Vector2[meshCombine.uv.Length];
-
- for (int j = 0; j < uvs.Length; j++)
- {
- uvs[j].x = rect.x + meshCombine.uv[j].x * rect.width;
- uvs[j].y = rect.y + meshCombine.uv[j].y * rect.height;
- }
-
- boneTmp.AddRange(smrs[i].bones);
-
- meshCombine.uv = uvs;
- combine[i].mesh = meshCombine;
- combine[i].transform = smrs[i].transform.localToWorldMatrix;
- GameObject.Destroy(smrs[i].gameObject);
- }
-
- Mesh newMesh = new Mesh();
- newMesh.CombineMeshes(combine, true, true);
-
- smrCombine.bones = boneTmp.ToArray();
- smrCombine.rootBone = rootBone;
- smrCombine.sharedMesh = newMesh;
- smrCombine.sharedMaterial = materialNew;
- }
- Mesh CreatMeshWithMesh(Mesh mesh)
- {
- Mesh mTmp = new Mesh();
- mTmp.vertices = mesh.vertices;
- mTmp.name = mesh.name;
- mTmp.uv = mesh.uv;
- mTmp.uv2 = mesh.uv2;
- mTmp.uv2 = mesh.uv2;
- mTmp.bindposes = mesh.bindposes;
- mTmp.boneWeights = mesh.boneWeights;
- mTmp.bounds = mesh.bounds;
- mTmp.colors = mesh.colors;
- mTmp.colors32 = mesh.colors32;
- mTmp.normals = mesh.normals;
- mTmp.subMeshCount = mesh.subMeshCount;
- mTmp.tangents = mesh.tangents;
- mTmp.triangles = mesh.triangles;
-
- return mTmp;
- }
未合并前,有两个网格,占用2drawcall,分别为人物和刀的网格和材质球。
合并后,只占用 1 drawcall了,而且AnimationController以及其动画能够正常工作:
合并好的网格:
合并好的贴图:
以上便是合并Mesh和Material的内容,目前只关注实现,还可以进一步优化,有以下几点要注意的:
1.合并的材质球需要使用同一个shader,如果多个材质球使用了不同shader,就要做进一步的出分类处理了。
2.材质球所用的Texture文件的Read/Write Enable选项要打上勾。
项目的github地址: https://github.com/arBao/MeshMaterialCombine
原创文章,转载请注明出处: http://blog.csdn.net/dardgen2015/article/details/51517860
Unity网格合并_材质合并
标签:地址 start off array CM tpi cts iss material
原文地址:https://www.cnblogs.com/nafio/p/9221775.html