LWJGL顶点索引缓冲区导致加载一半“网格”

        // Vertex Index Buffer
        idxVboId = glGenBuffers();
        vertsIdxBuffer = MemoryUtil.memAllocInt(indices.length);
        vertsIdxBuffer.put(indices).flip();
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,idxVboId);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER,vertsIdxBuffer,GL_STATIC_DRAW);

    shaderProgram.bind();

        //bind to vao
        glBindVertexArray(mesh.getVaoId());
        //enable positions buffer
        glEnableVertexAttribArray(0);
        //enable colour buffer
        glEnableVertexAttribArray(1);

        //draw verts
        glDrawElements(GL_TRIANGLES, 
        mesh.getVertexCount(),GL_UNSIGNED_INT,0);

        //restore state (?)
        glDisableVertexAttribArray(0);
        glDisableVertexAttribArray(1);
        glBindVertexArray(0);

        shaderProgram.unbind();

任何建议都很感谢,因为我已经盯着这几个小时了,真的看不出我犯了什么错误。

编辑:四边形网格代码

     renderer.init();

    float[] positions = new float[]{
            -0.5f,  0.5f, 0.0f,
            -0.5f, -0.5f, 0.0f,
            0.5f,  0.5f, 0.0f,
            0.5f,  0.5f, 0.0f,
            -0.5f, -0.5f, 0.0f,
            0.5f, -0.5f, 0.0f,
    };

    float[] colours = new float[]{0.5f,0f,0f,0f,0.5f,0f,0f,0f,0.5f,0f,0.5f,0.5f};

    int[] indices = new int[]{
            0, 1, 3, 3, 1, 2,
    };

    mesh = new BMesh(positions,colours,indices);

位置阵列更改前后

Before

After