Vuforia: How to change teapot with a text in the image targets example?

问题:

How do I change the teapot with a text content in Vuforia's Image Target example?

The example is available at : https://developer.vuforia.com/resources/sample-apps/image-targets-sample-app

回答1:

I tried to access the links mbrenon gave. Unfortunately they didn't load.

My solution:

The reason why you have a Teapot is because Vuforia is using that class as the image to be shown. In order to have a plane text, I created my own PlaneTextClass.

1. Go to src->main->java->com.qualcomm.vuforia.samples->SampleApplication->utils. There you could find the objects you can use.

2. Add a class named "TextPlane" and extended from "MeshObject"

   public class TextPlane extends MeshObject {    private final static double planeVertices[] =         {                 -50f, -50f, 0.0f, 50f, -50f, 0.0f, 50f, 50f, 0.0f, -50f, 50f, 0.0f         };   private final static double planeTexcoords[] =         {                 0, 0, 1, 0, 1, 1, 0, 1         };   private final static double planeNormals[] =         {                 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1         };   private final static short planeIndices[] =         {                 0, 1, 2, 0, 2, 3         };     private Buffer mVertBuff;   private Buffer mTexCoordBuff;   private Buffer mNormBuff;   private Buffer mIndBuff;    public TextPlane(){     mVertBuff = fillBuffer(planeVertices);     mTexCoordBuff = fillBuffer(planeTexcoords);     mNormBuff = fillBuffer(planeNormals);     mIndBuff = fillBuffer(planeIndices);   }    @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_INDICES:             result = mIndBuff;             break;         case BUFFER_TYPE_NORMALS:             result = mNormBuff;         default:             break;      }     return result;   }    @Override   public int getNumObjectVertex() {       return planeVertices.length / 3;   }    @Override   public int getNumObjectIndex() {       return planeIndices.length;   }}

If you want to change the size of the image, change the values in PlaneVertices[].

3. Go to src->main->java->com.qualcomm.vuforia.samples->VuforiaSamples->app->ImageTargets->ImageTargetRenderer.java

4. Add your new class in ImageTargetRenderer.java:

private TextPlane mTextPlane;

5. Initilize mTextPlane inside the method initRendering()

mTextPlane = new TextPlane();

6. Replace the teapot code with you new textplane code:

Replace this:

GLES20.glVertexAttribPointer(vertexHandle, 3, GLES20.GL_FLOAT,                         false, 0, mTeapot.getVertices());                 GLES20.glVertexAttribPointer(normalHandle, 3,