Question

I m试图装上我编成以下文件:

vertexX vertexY vertexZ normalX normalY normalZ

并且

index1 index2 index3

病媒和病媒阵列的形式,然后由我直接以开放式-ES的形式提供。我的问题是,当我试图将模型装入阵列时,大约需要40秒钟才能装上。我不敢肯定,为什么它如此缓慢,我看到其他法典只用几秒钟就装上同样的模式。任何建议? 我的档案装载法如下:

-(void)loadModel:(NSString*)filePath
{
    try {

    ifstream objFile([filePath UTF8String]);
    objFile >> numVertices;
    objFile.ignore(128,  
 );
    vertices.resize(numVertices*6);
    VertexNormal* vertex = (VertexNormal*) &vertices[0];
    svec3* faceDef;

    while (objFile) {
        char c = objFile.get();

        switch (c) {
            case  v :
            {
                objFile >> vertex->vertices.x >> vertex->vertices.y >> vertex->vertices.z
                >> vertex->normals.x >> vertex->normals.y >> vertex->normals.z;
                vertex++;
                break;
            }
            case  f :
            {
                objFile >> faceDef->x >> faceDef->y >> faceDef->z;
                faceDef++;
                break;
            }
            case  # :
            {
                part newPart;
                partList.push_back(newPart);
                numObjects++;
                objFile.ignore(128,  
 );
                int numFaces;
                objFile >> numFaces;
                partList[partList.size()-1].faces.resize(numFaces*3);
                partList[partList.size()-1].numFaces = numFaces;
                faceDef = (svec3*) &partList[partList.size()-1].faces[0];
                break;
            }
            default:
                break;
        }
        objFile.ignore(128,  
 );
    }
    objFile.close();
    free(objFile);
    } catch (NSException *ex) {
        NSLog(@"%@", [ex reason]);
    }
}

我的思路之一是将阵列编成双手文件,然后将其简单化为我的节目。虽然如此,但也许可以按照这些思路找到解决办法。

Answer 1

游戏行业的最佳做法是用双向格式保存所有模型数据,这样,你就可以很快装上可以作为vert、正常或任何其他东西代表的全非环外记忆。你们都需要这样做——使小指挥线工具把文字文件(obj)翻译成你自己的双手档案。

此外:

Did you try to do text loading with stdio library, not stl ifstream?
Maybe try to read all the text data once and fill arrays from memory, not from filesystem?
how much parts in file do you have? Each resize of std::vector leads to new allocation and copying. Try to reserve space in std::vector, if you know desired volume before.

Answer 2

I don t know if you ve considered this, but if your .obj files won t change in your application, you can format them as objective-C arrays and compile them directly with your code.

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