Unity3D优化静态对象系列二

 

在系列一中,我们已经知道了问题所在,一个是优化后我们模型位置改变了,另一个是如果是不同的材质的物体一起优化的时候,不同的材质的对象会消失掉,我们在系列二中主要是解决这两个问题:

接下来我们改进的思路是查找所有的MeshFilter,同时我们根据不同的材质对我们需要优化的对象进行分离。这就需要我们定义两个链表:


ArrayList materials = new ArrayList();
ArrayList combineInstanceArrays = new ArrayList();

下面我们开始遍历我们需要优化对象的MeshFilter和MeshRenderer,因为材质是与MeshRenderder相关联的代码如下:


foreach (GameObject obj in Objects)
{
if (!obj)
continue;

MeshFilter[] meshFilters = obj.GetComponentsInChildren<MeshFilter>();

foreach (MeshFilter meshFilter in meshFilters)
{
MeshRenderer meshRenderer = meshFilter.GetComponent<MeshRenderer>();

// Handle bad input
if (!meshRenderer)
{
Debug.LogError("MeshFilter does not have a coresponding MeshRenderer.");
continue;
}
if (meshRenderer.materials.Length != meshFilter.sharedMesh.subMeshCount)
{
Debug.LogError("Mismatch between material count and submesh count. Is this the correct MeshRenderer?");
continue;
}

for (int s = 0; s < meshFilter.sharedMesh.subMeshCount; s++)
{
int materialArrayIndex = 0;
for (materialArrayIndex = 0; materialArrayIndex < materials.Count; materialArrayIndex++)
{
if (materials[materialArrayIndex] == meshRenderer.sharedMaterials[s])
break;
}

if (materialArrayIndex == materials.Count)
{
materials.Add(meshRenderer.sharedMaterials[s]);
combineInstanceArrays.Add(new ArrayList());
}

CombineInstance combineInstance = new CombineInstance();
combineInstance.transform = meshRenderer.transform.localToWorldMatrix;
combineInstance.subMeshIndex = s;
combineInstance.mesh = meshFilter.sharedMesh;
(combineInstanceArrays[materialArrayIndex] as ArrayList).Add(combineInstance);
}

下面是针对MeshFilter的处理代码:


{
MeshFilter meshFilterCombine = gameObject.GetComponent<MeshFilter>();
if (!meshFilterCombine)
meshFilterCombine = gameObject.AddComponent<MeshFilter>();
Mesh[] meshes = new Mesh[materials.Count];
CombineInstance[] combineInstances = new CombineInstance[materials.Count];

for (int m = 0; m < materials.Count; m++)
{
CombineInstance[] combineInstanceArray = (combineInstanceArrays[m] as ArrayList).ToArray(typeof(CombineInstance)) as CombineInstance[];
meshes[m] = new Mesh();
meshes[m].CombineMeshes(combineInstanceArray, true, true);

combineInstances[m] = new CombineInstance();
combineInstances[m].mesh = meshes[m];
combineInstances[m].subMeshIndex = 0;
}
meshFilterCombine.sharedMesh = new Mesh();
meshFilterCombine.sharedMesh.CombineMeshes(combineInstances, false, false);
foreach (Mesh mesh in meshes)
{
mesh.Clear();
DestroyImmediate(mesh);
}
}

将其组合成一个Mesh,接下来也是最后一步创建Mesh Renderer并将材质赋值给它


{
MeshRenderer meshRendererCombine = gameObject.GetComponent<MeshRenderer>();
if (!meshRendererCombine)
meshRendererCombine = gameObject.AddComponent<MeshRenderer>();

Material[] materialsArray = materials.ToArray(typeof(Material)) as Material[];
meshRendererCombine.materials = materialsArray;
}
}

面我们看一下优化前后有啥变化,首先我们用四个Cube和一个Sphere,三种材质。效果图如下:

wKioL1S7oeWiYeqRAAHFHA8YuNg634.jpg

下面我们将我们优化的图展示一下:

wKioL1S7omrwXel6AAVMcI0OlAI656.jpg

对 比上图我们可以看到Saved by batching减少了,Used Textures 较少了,Render Textures使用的纹理大小也较少了,虽然相对来说Draw Call增加了,但是由于Render Textures少了,我们的优化效果达到了,而且位置也没变,多种材质也没问题了,但是还有个问题,就是我们的Cube有三个是相同的,但是我们看其材 质的效果图:

wKioL1S7o2bSHknmAAC14p3vx0w234.jpg

相同的材质写了三次,这说明我们的程序还需要继续去优化,以上代码只要将其组合在一起就可以使用了,我们将在讲台优化系列三中继续优化我们的优化程序。

作者:大洋    博客:http://jxwgame.blog.51cto.com