1.四棱锥: 由4个三角形构成。

四方体: 由6个三角形构成。

难点:在构建3D空间的顶点坐标时，要让对象绕自身的轴旋转，必须让对象的中心坐标总是(0.0f,0.0f,0.0f),

并且三角形都是按逆时针次序绘制的。

2.3D空间的绘制:

GL_APICALL void GL_APIENTRY glDrawArrays (GLenum mode, GLint first, GLsizei count);

参数说明：

mode，绘制方式，OpenGL2.0以后提供以下参数：GL_POINTS、GL_LINES、GL_LINE_LOOP、GL_LINE_STRIP、GL_TRIANGLES、GL_TRIANGLE_STRIP、GL_TRIANGLE_FAN。

first，从数组缓存中的哪一位开始绘制，一般为0。

count，数组中顶点的数量。

3.绘制顶点数组:

//绘制三角锥

for(int i=0; i<4; i++)

{

gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, i*3, 3);

}

//绘制四方体

for(int i=0; i<6; i++)

{

gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, i*4, 4);

}

[附]构建顶点数组:

[java]

int one = 0x10000;

// 四棱锥顶点数组:

private IntBuffer triggerBuffer = IntBuffer.wrap(new int[]{

0,one,0,

-one,-one,0,

one,-one,one,

0,one,0,

one,-one,one,

one,-one,-one,

0,one,0,

one,-one,-one,

-one,-one,-one,

0,one,0,

-one,-one,-one,

-one,-one,one

});

// 四方体顶点数组:

private IntBuffer quaterBuffer = IntBuffer.wrap(new int[]{

one,one,-one,

-one,one,-one,

one,one,one,

-one,one,one,

one,-one,one,

-one,-one,one,

one,-one,-one,

-one,-one,-one,

one,one,one,

-one,one,one,

one,-one,one,

-one,-one,one,

one,-one,-one,

-one,-one,-one,

one,one,-one,

-one,one,-one,

-one,one,one,

-one,one,-one,

-one,-one,one,

-one,-one,-one,

one, one, -one,

one, one, one,

one, -one, -one,

one, -one, one,

});

int one = 0x10000;

// 四棱锥顶点数组:

private IntBuffer triggerBuffer = IntBuffer.wrap(new int[]{

0,one,0,

-one,-one,0,

one,-one,one,

0,one,0,

one,-one,one,

one,-one,-one,

0,one,0,

one,-one,-one,

-one,-one,-one,

0,one,0,

-one,-one,-one,

-one,-one,one

});

// 四方体顶点数组:

private IntBuffer quaterBuffer = IntBuffer.wrap(new int[]{

one,one,-one,

-one,one,-one,

one,one,one,

-one,one,one,

one,-one,one,

-one,-one,one,

one,-one,-one,

-one,-one,-one,

one,one,one,

-one,one,one,

one,-one,one,

-one,-one,one,

one,-one,-one,

-one,-one,-one,

one,one,-one,

-one,one,-one,

-one,one,one,

-one,one,-one,

-one,-one,one,

-one,-one,-one,

one, one, -one,

one, one, one,

one, -one, -one,

one, -one, one,

});

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