xiaoxiamiheart

各位大虾，我想在主线程中用VSG提供的函数写一个添加标识符的符号，想添加一个平面，之后添加纹理进行处理。
可是下面是想画一个四边形可是怎么都不显示，若是改成画两条线的话，就可以显示，是什么原因？请各位大虾帮忙看看
vuVec4<float> *color=vuAllocArray<vuVec4<float> >::malloc(1);
        color[0].set(1.0f,0.0,0.0,1.0);
        //color[1].set(1.0f,0.0,0.0,1.0);
        //color[2].set(1.0f,0.0,0.0,1.0);
        vuVec3<float> *vertex=vuAllocArray<vuVec3<float> >::malloc(8);
        vertex[0].set(-5.0,0.0,10.0);
        vertex[1].set(5.0,0.0,10.0);
        vertex[2].set(5.0,0.0,5.0);
        vertex[3].set(-5.0,0.0,5.0);
        m_vrGeometry->setPrimitive(vrGeometry::PRIMITIVE_QUAD);
        m_vrGeometry->setNumPrimitives(1);
        m_vrGeometry->setColors(color,vrGeometry::BINDING_OVERALL );
        m_vrGeometry->setVertices(vertex);