Android | Vuforia 更换模型-Mikel

原文：http://blog.csdn.net/zhimou/article/details/43865503

1.获得一个obj模型文件(可以使用3dmax等建模软件制作，亦可直接百度下载)

2.
1)下载ActivePerl(百度下载)
http://download.csdn.net/detail/zhimou/8450071
2)下载obj2opengl(可以将.obj文件转化成.h)
http://download.csdn.net/detail/ggtaas/4998714

3.将obj2opengl.pl和你需要转换的obj放到C:\Perl\bin目录中
(这里我们以banana.obj为例)

4.运行命令提示符，定位到C:\Perl\bin目录下，输入命令：perl obj2opengl.pl banana.obj

这里写图片描述

这时候你会发现，bin文件夹中自动生成了banana.h文件。

5.修改代码
这部分有点繁，等哪天有空了再写教程，先放上代码…
1)仿照Teapot.java，新建一个Banana.java
主要任务是要替换模型数据，由于数据量大，这里使用了文件操作，我将verts, norms, texcoords三个模型数据放在文件中分别导入

同时要注意的是，TeaPot的实现有4个参数，而使用obj2opengl导出的.h数据中只有3个参数，缺少indices数据，不过不影响模型的显示，Sample中的Building也是只有3个参数，但具体原理我就不太懂了，跟opengl的知识有关，还望大神指教

/*===============================================================================
Copyright (c) 2012-2014 Qualcomm Connected Experiences, Inc. All Rights Reserved.

Vuforia is a trademark of QUALCOMM Incorporated, registered in the United States 
and other countries. Trademarks of QUALCOMM Incorporated are used with permission.
===============================================================================*/

package com.qualcomm.vuforia.samples.SampleApplication.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import android.content.res.AssetManager;
import android.util.Log;



public class Banana extends MeshObject
{

    private static final String LOGTAG = "Banana";

    private Buffer mVertBuff;
    private Buffer mTexCoordBuff;
    private Buffer mNormBuff;
    private Buffer mIndBuff;

    private int indicesNumber = 0;
    private int verticesNumber = 0;

    private AssetManager assetManager;

    public Banana(AssetManager inputassetManager)
    {
        this.assetManager = inputassetManager;
        setVerts();
        setTexCoords();
        setNorms();

    }


    double[] banana_VERTS;
    double[] banana_TEX_COORDS;
    double[] banana_NORMS;

    InputStream inputFile = null;


    private int loadVertsFromModel(String fileName)
            throws IOException
        {
            try
            {
                inputFile = assetManager.open(fileName);

                BufferedReader reader = new BufferedReader(
                    new InputStreamReader(inputFile));

                String line = reader.readLine();

                //ex.24168 3 floatsdata in 1 line
                int floatsToRead = Integer.parseInt(line);
                //int floatsToRead = 1000;

                banana_VERTS = new double[3*floatsToRead];


                for (int i = 0; i < floatsToRead; i++)
                {

                    String curline = reader.readLine();
                    if( curline.indexOf('/') >= 0 ){
                        i--;
                        continue;
                    }

                    //split 1 line to 3 data
                    String floatStrs[] = curline.split(",");

                    banana_VERTS[3*i] = Float.parseFloat(floatStrs[0]);
                    banana_VERTS[3*i+1] = Float.parseFloat(floatStrs[1]);
                    banana_VERTS[3*i+2] = Float.parseFloat(floatStrs[2]);
                    Log.d(LOGTAG, ""+i);
                }

                return floatsToRead;


            } finally
            {
                if (inputFile != null)
                    inputFile.close();
            }
        }
    private int loadTexCoordsFromModel(String fileName)
            throws IOException
        {
            try
            {
                inputFile = assetManager.open(fileName);

                BufferedReader reader = new BufferedReader(
                    new InputStreamReader(inputFile));

                String line = reader.readLine();

                //ex.24168 3 floatsdata in 1 line
                int floatsToRead = Integer.parseInt(line);
                //int floatsToRead = 1000;

                banana_TEX_COORDS = new double[2*floatsToRead];


                for (int i = 0; i < floatsToRead; i++)
                {

                    String curline = reader.readLine();
                    if( curline.indexOf('/') >= 0 ){
                        i--;
                        continue;
                    }

                    //split 1 line to 2 data
                    String floatStrs[] = curline.split(",");

                    banana_TEX_COORDS[2*i] = Float.parseFloat(floatStrs[0]);
                    banana_TEX_COORDS[2*i+1] = Float.parseFloat(floatStrs[1]);
                    //banana_TEX_COORDS[3*i+2] = Float.parseFloat(floatStrs[2]);
                }

                return floatsToRead;


            } finally
            {
                if (inputFile != null)
                    inputFile.close();
            }
        }

    private int loadNormsFromModel(String fileName)
            throws IOException
        {
            try
            {
                inputFile = assetManager.open(fileName);

                BufferedReader reader = new BufferedReader(
                    new InputStreamReader(inputFile));

                String line = reader.readLine();

                //ex.24168 3 floatsdata in 1 line
                int floatsToRead = Integer.parseInt(line);
                //int floatsToRead = 1000;

                banana_NORMS = new double[3*floatsToRead];


                for (int i = 0; i < floatsToRead; i++)
                {

                    String curline = reader.readLine();
                    if( curline.indexOf('/') >= 0 ){
                        i--;
                        continue;
                    }

                    //split 1 line to 3 data
                    String floatStrs[] = curline.split(",");

                    banana_NORMS[3*i] = Float.parseFloat(floatStrs[0]);
                    banana_NORMS[3*i+1] = Float.parseFloat(floatStrs[1]);
                    banana_NORMS[3*i+2] = Float.parseFloat(floatStrs[2]);
                }

                return floatsToRead;


            } finally
            {
                if (inputFile != null)
                    inputFile.close();
            }
        }

    private void setVerts()
    {
        int num = 0;
        try {
            num = loadVertsFromModel("ImageTargets/banana/verts.txt");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        mVertBuff = fillBuffer(banana_VERTS);
        verticesNumber = num ;
    }


    private void setTexCoords()
    {
        int num = 0;
        try {
            num = loadTexCoordsFromModel("ImageTargets/banana/texcoords.txt");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        mTexCoordBuff = fillBuffer(banana_TEX_COORDS);

    }


    private void setNorms()
    {
        int num = 0;
        try {
            num = loadNormsFromModel("ImageTargets/banana/norms.txt");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        mNormBuff = fillBuffer(banana_NORMS);
    }





    public int getNumObjectIndex()
    {
        return 0;
    }


    @Override
    public int getNumObjectVertex()
    {
        return verticesNumber;
    }


    @Override
    public Buffer getBuffer(BUFFER_TYPE bufferType)
    {
        Buffer result = null;
        switch (bufferType)
        {
            case BUFFER_TYPE_VERTEX:
                result = mVertBuff;
                break;
            case BUFFER_TYPE_TEXTURE_COORD:
                result = mTexCoordBuff;
                break;
            case BUFFER_TYPE_NORMALS:
                result = mNormBuff;
                break;
            default:
                break;

        }

        return result;
    }


}

2)修改ImageTargetRenderer.java
基本就是把TeaPot换成了Banana，然后绘图函数部分将glDrawElements替换成了glDrawArrays

/*===============================================================================
Copyright (c) 2012-2014 Qualcomm Connected Experiences, Inc. All Rights Reserved.

Vuforia is a trademark of QUALCOMM Incorporated, registered in the United States 
and other countries. Trademarks of QUALCOMM Incorporated are used with permission.
===============================================================================*/

package com.qualcomm.vuforia.samples.VuforiaSamples.app.ImageTargets;

import java.io.IOException;
import java.util.Vector;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.opengl.Matrix;
import android.util.Log;

import com.qualcomm.vuforia.Matrix44F;
import com.qualcomm.vuforia.Renderer;
import com.qualcomm.vuforia.State;
import com.qualcomm.vuforia.Tool;
import com.qualcomm.vuforia.Trackable;
import com.qualcomm.vuforia.TrackableResult;
import com.qualcomm.vuforia.VIDEO_BACKGROUND_REFLECTION;
import com.qualcomm.vuforia.Vuforia;
import com.qualcomm.vuforia.samples.SampleApplication.SampleApplicationSession;
import com.qualcomm.vuforia.samples.SampleApplication.utils.CubeShaders;
import com.qualcomm.vuforia.samples.SampleApplication.utils.LoadingDialogHandler;
import com.qualcomm.vuforia.samples.SampleApplication.utils.SampleApplication3DModel;
import com.qualcomm.vuforia.samples.SampleApplication.utils.SampleUtils;
import com.qualcomm.vuforia.samples.SampleApplication.utils.Teapot;
import com.qualcomm.vuforia.samples.SampleApplication.utils.Banana;
import com.qualcomm.vuforia.samples.SampleApplication.utils.Texture;


// The renderer class for the ImageTargets sample. 
public class ImageTargetRenderer implements GLSurfaceView.Renderer
{
    private static final String LOGTAG = "ImageTargetRenderer";

    private SampleApplicationSession vuforiaAppSession;
    private ImageTargets mActivity;

    private Vector<Texture> mTextures;

    private int shaderProgramID;

    private int vertexHandle;

    private int normalHandle;

    private int textureCoordHandle;

    private int mvpMatrixHandle;

    private int texSampler2DHandle;

    private Teapot mTeapot;

    private Banana mBanana;

    private float kBuildingScale = 120.0f;
    private SampleApplication3DModel mBuildingsModel;

    private Renderer mRenderer;

    boolean mIsActive = false;

    private static final float OBJECT_SCALE_FLOAT = 50.0f;


    public ImageTargetRenderer(ImageTargets activity,
        SampleApplicationSession session)
    {
        mActivity = activity;
        vuforiaAppSession = session;
    }


    // Called to draw the current frame.
    @Override
    public void onDrawFrame(GL10 gl)
    {
        if (!mIsActive)
            return;

        // Call our function to render content
        renderFrame();
    }


    // Called when the surface is created or recreated.
    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config)
    {
        Log.d(LOGTAG, "GLRenderer.onSurfaceCreated");

        initRendering();

        // Call Vuforia function to (re)initialize rendering after first use
        // or after OpenGL ES context was lost (e.g. after onPause/onResume):
        vuforiaAppSession.onSurfaceCreated();
    }


    // Called when the surface changed size.
    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height)
    {
        Log.d(LOGTAG, "GLRenderer.onSurfaceChanged");

        // Call Vuforia function to handle render surface size changes:
        vuforiaAppSession.onSurfaceChanged(width, height);
    }


    // Function for initializing the renderer.
    private void initRendering()
    {
        //mTeapot = new Teapot();
        mBanana = new Banana(mActivity.getResources().getAssets());

        mRenderer = Renderer.getInstance();

        GLES20.glClearColor(0.0f, 0.0f, 0.0f, Vuforia.requiresAlpha() ? 0.0f
            : 1.0f);

        for (Texture t : mTextures)
        {
            GLES20.glGenTextures(1, t.mTextureID, 0);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, t.mTextureID[0]);
            GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
            GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA,
                t.mWidth, t.mHeight, 0, GLES20.GL_RGBA,
                GLES20.GL_UNSIGNED_BYTE, t.mData);
        }

        shaderProgramID = SampleUtils.createProgramFromShaderSrc(
            CubeShaders.CUBE_MESH_VERTEX_SHADER,
            CubeShaders.CUBE_MESH_FRAGMENT_SHADER);

        vertexHandle = GLES20.glGetAttribLocation(shaderProgramID,
            "vertexPosition");
        normalHandle = GLES20.glGetAttribLocation(shaderProgramID,
            "vertexNormal");
        textureCoordHandle = GLES20.glGetAttribLocation(shaderProgramID,
            "vertexTexCoord");
        mvpMatrixHandle = GLES20.glGetUniformLocation(shaderProgramID,
            "modelViewProjectionMatrix");
        texSampler2DHandle = GLES20.glGetUniformLocation(shaderProgramID,
            "texSampler2D");

        try
        {
            mBuildingsModel = new SampleApplication3DModel();
            mBuildingsModel.loadModel(mActivity.getResources().getAssets(),
                "ImageTargets/Buildings.txt");
        } catch (IOException e)
        {
            Log.e(LOGTAG, "Unable to load buildings");
        }

        // Hide the Loading Dialog
        mActivity.loadingDialogHandler
            .sendEmptyMessage(LoadingDialogHandler.HIDE_LOADING_DIALOG);

    }


    // The render function.
    private void renderFrame()
    {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);

        State state = mRenderer.begin();
        mRenderer.drawVideoBackground();

        GLES20.glEnable(GLES20.GL_DEPTH_TEST);

        // handle face culling, we need to detect if we are using reflection
        // to determine the direction of the culling
        GLES20.glEnable(GLES20.GL_CULL_FACE);
        GLES20.glCullFace(GLES20.GL_BACK);
        if (Renderer.getInstance().getVideoBackgroundConfig().getReflection() == VIDEO_BACKGROUND_REFLECTION.VIDEO_BACKGROUND_REFLECTION_ON)
            GLES20.glFrontFace(GLES20.GL_CW); // Front camera
        else
            GLES20.glFrontFace(GLES20.GL_CCW); // Back camera

        // did we find any trackables this frame?
        for (int tIdx = 0; tIdx < state.getNumTrackableResults(); tIdx++)
        {
            TrackableResult result = state.getTrackableResult(tIdx);
            Trackable trackable = result.getTrackable();
            printUserData(trackable);
            Matrix44F modelViewMatrix_Vuforia = Tool
                .convertPose2GLMatrix(result.getPose());
            float[] modelViewMatrix = modelViewMatrix_Vuforia.getData();

//            int textureIndex = trackable.getName().equalsIgnoreCase("stones") ? 0
//                : 1;
            int textureIndex = trackable.getName().equalsIgnoreCase("Tree") ? 0
                    : 1;
            textureIndex = trackable.getName().equalsIgnoreCase("tarmac") ? 2
                : textureIndex;

            // deal with the modelview and projection matrices
            float[] modelViewProjection = new float[16];

            if (!mActivity.isExtendedTrackingActive())
            {
                Matrix.translateM(modelViewMatrix, 0, 0.0f, 0.0f,
                    OBJECT_SCALE_FLOAT);
                Matrix.scaleM(modelViewMatrix, 0, OBJECT_SCALE_FLOAT,
                    OBJECT_SCALE_FLOAT, OBJECT_SCALE_FLOAT);
            } else
            {
                Matrix.rotateM(modelViewMatrix, 0, 90.0f, 1.0f, 0, 0);
                Matrix.scaleM(modelViewMatrix, 0, kBuildingScale,
                    kBuildingScale, kBuildingScale);
            }

            Matrix.multiplyMM(modelViewProjection, 0, vuforiaAppSession
                .getProjectionMatrix().getData(), 0, modelViewMatrix, 0);

            // activate the shader program and bind the vertex/normal/tex coords
            GLES20.glUseProgram(shaderProgramID);

            if (!mActivity.isExtendedTrackingActive())
            {
                GLES20.glVertexAttribPointer(vertexHandle, 3, GLES20.GL_FLOAT,
                    //false, 0, mTeapot.getVertices());
                    false, 0, mBanana.getVertices());
                GLES20.glVertexAttribPointer(normalHandle, 3, GLES20.GL_FLOAT,
                    //false, 0, mTeapot.getNormals());
                    false, 0, mBanana.getNormals());
                GLES20.glVertexAttribPointer(textureCoordHandle, 2,
                    //GLES20.GL_FLOAT, false, 0, mTeapot.getTexCoords());
                    GLES20.GL_FLOAT, false, 0, mBanana.getTexCoords());
                GLES20.glEnableVertexAttribArray(vertexHandle);
                GLES20.glEnableVertexAttribArray(normalHandle);
                GLES20.glEnableVertexAttribArray(textureCoordHandle);

                // activate texture 0, bind it, and pass to shader
                GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
                GLES20.glBindTexture(GLES20.GL_TEXTURE_2D,
                    mTextures.get(textureIndex).mTextureID[0]);
                GLES20.glUniform1i(texSampler2DHandle, 0);

                // pass the model view matrix to the shader
                GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false,
                    modelViewProjection, 0);

                // finally draw the teapot
//                GLES20.glDrawElements(GLES20.GL_TRIANGLES,
//                    mTeapot.getNumObjectIndex(), GLES20.GL_UNSIGNED_SHORT,
//                    mTeapot.getIndices());
                GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0,
                     mBanana.getNumObjectVertex());

                // disable the enabled arrays
                GLES20.glDisableVertexAttribArray(vertexHandle);
                GLES20.glDisableVertexAttribArray(normalHandle);
                GLES20.glDisableVertexAttribArray(textureCoordHandle);
            } else
            {
                GLES20.glDisable(GLES20.GL_CULL_FACE);
                GLES20.glVertexAttribPointer(vertexHandle, 3, GLES20.GL_FLOAT,
                    //false, 0, mBuildingsModel.getVertices());
                        false, 0, mBanana.getVertices());
                GLES20.glVertexAttribPointer(normalHandle, 3, GLES20.GL_FLOAT,
                    //false, 0, mBuildingsModel.getNormals());
                        false, 0, mBanana.getNormals());
                GLES20.glVertexAttribPointer(textureCoordHandle, 2,
                    //GLES20.GL_FLOAT, false, 0, mBuildingsModel.getTexCoords());
                        GLES20.GL_FLOAT, false, 0, mBanana.getTexCoords());

                GLES20.glEnableVertexAttribArray(vertexHandle);
                GLES20.glEnableVertexAttribArray(normalHandle);
                GLES20.glEnableVertexAttribArray(textureCoordHandle);

                GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
                GLES20.glBindTexture(GLES20.GL_TEXTURE_2D,
                    mTextures.get(3).mTextureID[0]);
                GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false,
                    modelViewProjection, 0);
                GLES20.glUniform1i(texSampler2DHandle, 0);
                GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0,
                    //mBuildingsModel.getNumObjectVertex());
                        mBanana.getNumObjectVertex());

                SampleUtils.checkGLError("Renderer DrawBuildings");
            }

            SampleUtils.checkGLError("Render Frame");

        }

        GLES20.glDisable(GLES20.GL_DEPTH_TEST);

        mRenderer.end();
    }


    private void printUserData(Trackable trackable)
    {
        String userData = (String) trackable.getUserData();
        Log.d(LOGTAG, "UserData:Retreived User Data \"" + userData + "\"");
    }


    public void setTextures(Vector<Texture> textures)
    {
        mTextures = textures;

    }

}

3)修改ImageTargets.java
把贴图文件banana.png 放到和Teapot贴图相同的路径下，并修改以下代码

    private void loadTextures()
    {
        mTextures.add(Texture.loadTextureFromApk("banana.png",
            getAssets()));
        //mTextures.add(Texture.loadTextureFromApk("TextureTeapotBrass.png",
          //  getAssets()));
//        mTextures.add(Texture.loadTextureFromApk("TextureTeapotBlue.png",
//            getAssets()));
//        mTextures.add(Texture.loadTextureFromApk("TextureTeapotRed.png",
//            getAssets()));
        mTextures.add(Texture.loadTextureFromApk("ImageTargets/Buildings.jpeg",
            getAssets()));

    }

如果贴图显示有问题，可以试着将贴图的方向调整一下

效果图：
这里写图片描述

Android | Vuforia 更换模型

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