Question

我正在制作一个简单的App，以在相机视图中的某个距离处显示一个多维数据集，当旋转手机时，该场景将不在场景中。我正在使用Vuforia AR显示相机背景。下面是渲染功能。背景变得很好。虽然我正在显示的多维数据集是静态的（它看起来看起来有些距离，但不会超出场景）。我很困惑如何在旋转手机时使多维数据集脱离场景。任何帮助，将不胜感激。谢谢

    public void renderVideoBackground()
{
    if(currentView == VIEW.VIEW_POSTPROCESS)
        return;

    int vbVideoTextureUnit = 0;
    // Bind the video bg texture and get the Texture ID from Vuforia
    videoBackgroundTex.setTextureUnit(vbVideoTextureUnit);
    if (!mRenderer.updateVideoBackgroundTexture(videoBackgroundTex))
    {
        Log.e(LOGTAG, "Unable to update video background texture");
        return;
    }

    float[] vbProjectionMatrix = Tool.convert2GLMatrix(
            mRenderingPrimitives.getVideoBackgroundProjectionMatrix(currentView, COORDINATE_SYSTEM_TYPE.COORDINATE_SYSTEM_CAMERA)).getData();

    if (Device.getInstance().isViewerActive()) {
        float sceneScaleFactor = (float)getSceneScaleFactor();
        scaleM(vbProjectionMatrix, 0, sceneScaleFactor, sceneScaleFactor, 1.0f);
    }



    GLES20.glDisable(GLES20.GL_DEPTH_TEST);
    GLES20.glDisable(GLES20.GL_CULL_FACE);
    GLES20.glDisable(GLES20.GL_SCISSOR_TEST);

    Mesh vbMesh = mRenderingPrimitives.getVideoBackgroundMesh(currentView);
    // Load the shader and upload the vertex/texcoord/index data
    GLES20.glUseProgram(vbShaderProgramID);
    GLES20.glVertexAttribPointer(vbVertexHandle, 3, GLES20.GL_FLOAT, false, 0, vbMesh.getPositions().asFloatBuffer());
    GLES20.glVertexAttribPointer(vbTexCoordHandle, 2, GLES20.GL_FLOAT, false, 0, vbMesh.getUVs().asFloatBuffer());

    GLES20.glUniform1i(vbTexSampler2DHandle, vbVideoTextureUnit);

    // Render the video background with the custom shader
    // enable the vertex arrays
    GLES20.glEnableVertexAttribArray(vbVertexHandle);
    GLES20.glEnableVertexAttribArray(vbTexCoordHandle);

    // Pass the projection matrix to OpenGL
    GLES20.glUniformMatrix4fv(vbProjectionMatrixHandle, 1, false, vbProjectionMatrix, 0);

    // render call
    GLES20.glDrawElements(GLES20.GL_TRIANGLES, vbMesh.getNumTriangles() * 3, GLES20.GL_UNSIGNED_SHORT,
            vbMesh.getTriangles().asShortBuffer());

    //Model View matrix for the cube.
    float[]  modelViewMatrix = new float[16];
    modelViewMatrix[0] =1;
    modelViewMatrix[5] =1;
    modelViewMatrix[10] =1;
    modelViewMatrix[15] =1;

   //translate and scale
   translateM(modelViewMatrix, 0, 0f, 0f, 1.0f);
     scaleM(modelViewMatrix,0,
             0.2f,0.2f,0.2f);
    //mvp
    float temp[] = new float[16];
    multiplyMM(temp, 0, vbProjectionMatrix, 0, modelViewMatrix, 0);

    GLES20.glVertexAttribPointer(vbVertexHandle, 3, GLES20.GL_FLOAT,
            false, 0, mCube.getVertices());
    GLES20.glVertexAttribPointer(vbTexCoordHandle, 2,
            GLES20.GL_FLOAT, false, 0, mCube.getTexCoords());

    // activate texture 0, bind it, and pass to shader
    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texturess);

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

    // draw the cube
    GLES20.glDrawElements(GLES20.GL_TRIANGLES,
            mCube.getNumObjectIndex(), GLES20.GL_UNSIGNED_SHORT,
            mCube.getIndices());

    //disable the vertex arrays
    GLES20.glDisableVertexAttribArray(vbVertexHandle);
    GLES20.glDisableVertexAttribArray(vbTexCoordHandle);

    Shader.checkGLError("Rendering of the video background failed");
}

如何使用openglES在手机摄像头内部渲染对象？

0 个答案: