模型不可见android OpenGL ES 2.0

Question

I am currently trying to display my model I exported from blender. I have parsed this file and have 2 arrays, one of which holds the vertex data and the other holds the index data. My bindData method binds the vertex data to the shader program. The problem I am encountering is that the asteroid is not being drawn(or they are being drawn but cannot see them). I can provide more code or clarify my problem further if needed.

public Asteroid(){
    vertexArray = new VertexArray(AsteroidFinal.VERTEX_ARRAY);

    indexBuffer = ByteBuffer
            .allocateDirect(AsteroidFinal.INDICES_ARRAY.length * 2)
            .order(ByteOrder.nativeOrder())
            .asShortBuffer()
            .put((short) AsteroidFinal.INDICES_ARRAY.length);
    indexBuffer.position(0);
}


public void bindData(ColorShaderProgram colorProgram){
      vertexArray.setVertexAttribPointer(
                0, 
                colorProgram.getPositionAttributeLocation(), 
                POSITION_COMPONENT_COUNT,
                0);
}

public void draw(){
    //glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);
    glDrawElements(GL_TRIANGLE_FAN, AsteroidFinal.INDICES_ARRAY.length, GL_UNSIGNED_SHORT, indexBuffer);
}

Answer 1

It looks like you're not storing the indices in the index buffer:

indexBuffer = ByteBuffer
        .allocateDirect(AsteroidFinal.INDICES_ARRAY.length * 2)
        .order(ByteOrder.nativeOrder())
        .asShortBuffer()
        .put((short) AsteroidFinal.INDICES_ARRAY.length);

This adds the length of the array to the buffer, not the actual array values. It should be:

indexBuffer = ByteBuffer
        .allocateDirect(AsteroidFinal.INDICES_ARRAY.length * 2)
        .order(ByteOrder.nativeOrder())
        .asShortBuffer()
        .put(AsteroidFinal.INDICES_ARRAY);