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我試圖在程序找到目標時用png圖像替換茶壺。我使用vuforia 4.Nexus設備中的OpenGL2.0渲染問題（Android中的Vuforia）
這是我使用的代碼：
private void renderFrame() {
State state = mRenderer.begin();
mRenderer.drawVideoBackground();
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
if (state.getNumTrackableResults() == 0)
displayMessage("nothing");
// did we find any trackables this frame?
for (int tIdx = 0; tIdx < state.getNumTrackableResults(); tIdx++) {
TrackableResult result = state.getTrackableResult(tIdx);
Trackable trackable = result.getTrackable();
ImageTarget itarget = (ImageTarget) trackable;
Log.d("USER", itarget.getName());
Matrix44F modelViewMatrix_Vuforia = Tool
.convertPose2GLMatrix(result.getPose());
float[] modelViewMatrix = modelViewMatrix_Vuforia.getData();
float[] modelViewProjection = new float[16];
Matrix.translateM(modelViewMatrix, 0, 0.0f, 0.0f,
OBJECT_SCALE_FLOAT);
Matrix.scaleM(modelViewMatrix, 0, OBJECT_SCALE_FLOAT,
OBJECT_SCALE_FLOAT, OBJECT_SCALE_FLOAT);
Matrix.translateM(modelViewMatrix, 0, 0.0f, 0.0f, 0.0f);
Vec3F targetSize = itarget.getSize();
Matrix.scaleM(modelViewMatrix, 0, targetSize.getData()[0],
targetSize.getData()[1], 1.0f);
Matrix.multiplyMM(modelViewProjection, 0, vuforiaAppSession
.getProjectionMatrix().getData(), 0, modelViewMatrix, 0);
GLES20.glUseProgram(shaderProgramID);
if (!mActivity.isExtendedTrackingActive()) {
GLES20.glVertexAttribPointer(vertexHandle, 3, GLES20.GL_FLOAT,
false, 0, mTeapot.getVertices());
GLES20.glVertexAttribPointer(normalHandle, 3, GLES20.GL_FLOAT,
false, 0, mTeapot.getNormals());
GLES20.glVertexAttribPointer(textureCoordHandle, 2,
GLES20.GL_FLOAT, false, 0, mTeapot.getTexCoords());
GLES20.glEnableVertexAttribArray(vertexHandle);
GLES20.glEnableVertexAttribArray(normalHandle);
GLES20.glEnableVertexAttribArray(textureCoordHandle);
int index = 0;
if (itarget.getName().equals("ERMITA-2-1")) {
index = 1;
}
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D,
mTextures.get(index).mTextureID[0]);
GLES20.glUniform1i(texSampler2DHandle, 0);
// pass the model view matrix to the shader
GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false,
modelViewProjection, 0);
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA,
GLES20.GL_ONE_MINUS_SRC_ALPHA);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6,
GLES20.GL_UNSIGNED_SHORT, mTeapot.getIndices());
GLES20.glDisable(GLES20.GL_BLEND);
lastTrackableId = -1;
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());
GLES20.glVertexAttribPointer(normalHandle, 3, GLES20.GL_FLOAT,
false, 0, mBuildingsModel.getNormals());
GLES20.glVertexAttribPointer(textureCoordHandle, 2,
GLES20.GL_FLOAT, false, 0,
mBuildingsModel.getTexCoords());
GLES20.glEnableVertexAttribArray(vertexHandle);
GLES20.glEnableVertexAttribArray(normalHandle);
GLES20.glEnableVertexAttribArray(textureCoordHandle);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D,
mTextures.get(0).mTextureID[0]);
GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false,
modelViewProjection, 0);
GLES20.glUniform1i(texSampler2DHandle, 0);
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0,
mBuildingsModel.getNumObjectVertex());
SampleUtils.checkGLError("Renderer DrawBuildings");
}
SampleUtils.checkGLError("Render Frame");
}
GLES20.glDisable(GLES20.GL_DEPTH_TEST);
// GLES20.glDisable(GLES20.GL_BLEND);
mRenderer.end();
}
它的工作原理與像銀河S2和通用片一些設備。我遇到的問題引起了以下設備：
Nexus 4：Android 5.1：識別目標（打印日誌）和一些奇怪的東西出現在屏幕上。它似乎設法渲染紋理，但它立即消失。
Nexus 10：Android 5.1：識別目標（打印日誌），但什麼都不做，根本沒有渲染。沒有錯誤消息。
壹加壹：Android 4.4的：同的Nexus 10
任何想法？
我已經在Vuforia開發論壇上發佈了這個問題，但它似乎是渲染問題而不是Vuforia問題。