5.3D空间---SharpGL【5】

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在上节课的内容上作些扩展，我们现在开始生成真正的3D对象，而不是象前两节课中那样3D世界中的2D对象。我们给三角形增加一个左侧面，一个右侧面，一个后侧面来生成一个金字塔(四棱锥)。给正方形增加左、右、上、下及背面生成一个立方体。

我们混合金字塔上的颜色，创建一个平滑着色的对象。给立方体的每一面则来个不同的颜色。

】from Nehe

OpenGLDraw事件响应的源代码如下，这一章节和Nehe的OpenGL教程叙述基本一致，细节可以读Nehe的教程：http://www.imyaker.com/nehe/的第五课

privatevoid openGLControl1_OpenGLDraw(object sender, PaintEventArgs e)

{

// Get the OpenGL object, just to clean up the code.

SharpGL.OpenGL gl =this.openGLControl1.OpenGL;

gl.Clear(OpenGL.COLOR_BUFFER_BIT | OpenGL.DEPTH_BUFFER_BIT);// Clear The Screen And The Depth Buffer

gl.LoadIdentity(); // Reset The View

gl.Translate(-1.5f, 0.0f, -6.0f); // Move Left And Into The Screen

gl.Rotate(rtri, 0.0f, 1.0f, 0.0f); // Rotate The Pyramid On It's Y Axis

gl.Begin(OpenGL.TRIANGLES); // Start Drawing The Pyramid

gl.Color(1.0f, 0.0f, 0.0f); // Red

gl.Vertex(0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)

gl.Color(0.0f, 1.0f, 0.0f); // Green

gl.Vertex(-1.0f, -1.0f, 1.0f); // Left Of Triangle (Front)

gl.Color(0.0f, 0.0f, 1.0f); // Blue

gl.Vertex(1.0f, -1.0f, 1.0f); // Right Of Triangle (Front)

gl.Color(1.0f, 0.0f, 0.0f); // Red

gl.Vertex(0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)

gl.Color(0.0f, 0.0f, 1.0f); // Blue

gl.Vertex(1.0f, -1.0f, 1.0f); // Left Of Triangle (Right)

gl.Color(0.0f, 1.0f, 0.0f); // Green

gl.Vertex(1.0f, -1.0f, -1.0f); // Right Of Triangle (Right)

gl.Color(1.0f, 0.0f, 0.0f); // Red

gl.Vertex(0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)

gl.Color(0.0f, 1.0f, 0.0f); // Green

gl.Vertex(1.0f, -1.0f, -1.0f); // Left Of Triangle (Back)

gl.Color(0.0f, 0.0f, 1.0f); // Blue

gl.Vertex(-1.0f, -1.0f, -1.0f); // Right Of Triangle (Back)

gl.Color(1.0f, 0.0f, 0.0f); // Red

gl.Vertex(0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)

gl.Color(0.0f, 0.0f, 1.0f); // Blue

gl.Vertex(-1.0f, -1.0f, -1.0f); // Left Of Triangle (Left)

gl.Color(0.0f, 1.0f, 0.0f); // Green

gl.Vertex(-1.0f, -1.0f, 1.0f); // Right Of Triangle (Left)

gl.End(); // Done Drawing The Pyramid

gl.LoadIdentity();

gl.Translate(1.5f, 0.0f, -7.0f); // Move Right And Into The Screen

gl.Rotate(rquad, 1.0f, 1.0f, 1.0f); // Rotate The Cube On X, Y & Z

gl.Begin(OpenGL.QUADS); // Start Drawing The Cube

gl.Color(0.0f, 1.0f, 0.0f); // Set The Color To Green

gl.Vertex(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)

gl.Vertex(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)

gl.Vertex(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)

gl.Vertex(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)

gl.Color(1.0f, 0.5f, 0.0f); // Set The Color To Orange

gl.Vertex(1.0f, -1.0f, 1.0f); // Top Right Of The Quad (Bottom)

gl.Vertex(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad (Bottom)

gl.Vertex(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Bottom)

gl.Vertex(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Bottom)

gl.Color(1.0f, 0.0f, 0.0f); // Set The Color To Red

gl.Vertex(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)

gl.Vertex(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)

gl.Vertex(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Front)

gl.Vertex(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Front)

gl.Color(1.0f, 1.0f, 0.0f); // Set The Color To Yellow

gl.Vertex(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Back)

gl.Vertex(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Back)

gl.Vertex(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)

gl.Vertex(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)

gl.Color(0.0f, 0.0f, 1.0f); // Set The Color To Blue

gl.Vertex(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)

gl.Vertex(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)

gl.Vertex(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Left)

gl.Vertex(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Left)

gl.Color(1.0f, 0.0f, 1.0f); // Set The Color To Violet

gl.Vertex(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)

gl.Vertex(1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)

gl.Vertex(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Right)

gl.Vertex(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Right)

gl.End(); // Done Drawing The Q

gl.Flush();

rtri += 3.0f;// 0.2f; // Increase The Rotation Variable For The Triangle

rquad -= 3.0f;// 0.15f; // Decrease The Rotation Variable For The Quad

}

运行效果：

源代码见最后附件

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