tutorial_25.htm

如果你相信它就好好学学吧,同样这里也只是个入门

</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面的代码用来加载一个模型文件，并为模型分配内存，把数据存储进去。</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>void objload(char *name,OBJECT *k)							<font color="#ffffaa">// 从文件加载一个模型</font>
{
	int	ver;								<font color="#ffffaa">// 保存顶点个数</font>
	float	rx,ry,rz;								<font color="#ffffaa">// 保存模型位置</font>
	FILE	*filein;								<font color="#ffffaa">// 打开的文件句柄</font>
	char	oneline[255];							<font color="#ffffaa">// 保存255个字符</font>

	filein = fopen(name, "rt");							<font color="#ffffaa">// 打开文本文件，供读取</font>
											
	readstr(filein,oneline);							<font color="#ffffaa">// 读入一行文本</font>
	sscanf(oneline, "Vertices: %d\n", &amp;ver);					<font color="#ffffaa">// 搜索字符串"Vertices: "，并把其后的顶点数保存在ver变量中</font>
	k-&gt;verts=ver;								<font color="#ffffaa">// 设置模型的顶点个数</font>
	objallocate(k,ver);							<font color="#ffffaa">// 为模型数据分配内存</font>
</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面的循环，读取每一行（即每个顶点）的数据，并把它保存到内存中?/td&gt;
    </td><td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
</font><pre><font color="#aaffaa" size="3">	for (int i=0;i&lt;ver;i++)								<font color="#ffffaa">// 循环所有的顶点</font>
	{
		readstr(filein,oneline);							<font color="#ffffaa">// 读取一行数据</font>
		sscanf(oneline, "%f %f %f", &amp;rx, &amp;ry, &amp;rz);					<font color="#ffffaa">// 把顶点数据保存在rx,ry,rz中</font>
</font></pre>
<font color="#aaffaa" size="3"> 
<pre>		k-&gt;points[i].x = rx;							<font color="#ffffaa">// 保存当前顶点的x坐标</font>
		k-&gt;points[i].y = ry;							<font color="#ffffaa">// 保存当前顶点的y坐标</font>
		k-&gt;points[i].z = rz;							<font color="#ffffaa">// 保存当前顶点的z坐标</font>
	}
	fclose(filein);									<font color="#ffffaa">// 关闭文件</font>

	if(ver&gt;maxver) maxver=ver;								<font color="#ffffaa">// 记录最大的顶点数</font>
}										</pre>
</font> 
<table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面的函数根据设定的间隔，计算第i个顶点每次变换的位移</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>VERTEX calculate(int i)									<font color="#ffffaa">// 计算第i个顶点每次变换的位移</font>
{
	VERTEX a;								
	a.x=(sour-&gt;points[i].x-dest-&gt;points[i].x)/steps;				
	a.y=(sour-&gt;points[i].y-dest-&gt;points[i].y)/steps;				
	a.z=(sour-&gt;points[i].z-dest-&gt;points[i].z)/steps;				
	return a;									
}											</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%"><font color="#ffffff">ReSizeGLScene()函数没有变化</font></td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3"><pre>GLvoid ReSizeGLScene(GLsizei width, GLsizei height)
</pre></font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面的函数完成初始化功能，它设置混合模式为半透明</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>int InitGL(GLvoid)			
{
	glBlendFunc(GL_SRC_ALPHA,GL_ONE);						<font color="#ffffaa">// 设置半透明混合模式</font>
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);					<font color="#ffffaa">// 设置清除色为黑色</font>
	glClearDepth(1.0);								<font color="#ffffaa">// 设置深度缓存中值为1</font>
	glDepthFunc(GL_LESS);							<font color="#ffffaa">// 设置深度测试函数</font>
	glEnable(GL_DEPTH_TEST);							<font color="#ffffaa">// 启用深度测试</font>
	glShadeModel(GL_SMOOTH);							<font color="#ffffaa">// 设置着色模式为光滑着色</font>
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);			</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面的代码用来加载我们的模型物体</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>	maxver=0;									<font color="#ffffaa">// 初始化最大顶点数为0</font>
	objload("data/sphere.txt",&amp;morph1);						<font color="#ffffaa">// 加载球模型</font>
	objload("data/torus.txt",&amp;morph2);						<font color="#ffffaa">// 加载圆环模型</font>
	objload("data/tube.txt",&amp;morph3);						<font color="#ffffaa">// 加载立方体模型</font>
</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">第四个模型不从文件读取，我们在（-7，-7，-7）-（7，7，7）之间随机生成模型点,它和我们载如的模型都一样具有486个顶点。</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>	objallocate(&amp;morph4,486);							<font color="#ffffaa">// 为第四个模型分配内存资源</font>
	for(int i=0;i&lt;486;i++)							<font color="#ffffaa">// 随机设置486个顶点</font>
	{
		morph4.points[i].x=((float)(rand()%14000)/1000)-7;			
		morph4.points[i].y=((float)(rand()%14000)/1000)-7;			<font color="#ffffaa"> </font>
		morph4.points[i].z=((float)(rand()%14000)/1000)-7;			
	}
</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">初始化中间模型为球体，并把原和目标模型都设置为球</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>	objload("data/sphere.txt",&amp;helper);
	sour=dest=&amp;morph1;								

	return TRUE;									<font color="#ffffaa">// 初始化完成，成功返回</font>
}
</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">下面是具体的绘制代码，向往常一样我们先设置模型变化，以便我们更好的观察。</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>void DrawGLScene(GLvoid)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);				<font color="#ffffaa">// 清空缓存</font>
	glLoadIdentity();								<font color="#ffffaa">// 重置模型变换矩阵</font>
	glTranslatef(cx,cy,cz);							<font color="#ffffaa">// 平移和旋转</font>
	glRotatef(xrot,1,0,0);								
	glRotatef(yrot,0,1,0);							
	glRotatef(zrot,0,0,1);								

	xrot+=xspeed; yrot+=yspeed; zrot+=zspeed;					<font color="#ffffaa">// 根据旋转速度，增加旋转角度</font>

	GLfloat tx,ty,tz;								<font color="#ffffaa">// 顶点临时变量</font>
	VERTEX q;									<font color="#ffffaa">// 保存中间计算的临时顶点</font></pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">接下来我们来绘制模型中的点，如果启用了变形，则计算变形的中间过程点。</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table><font color="#aaffaa" size="3">
<pre>	glBegin(GL_POINTS);								<font color="#ffffaa">// 点绘制开始</font>
		for(int i=0;i&lt;morph1.verts;i++)						<font color="#ffffaa">// 循环绘制模型1中的每一个顶点</font>
		{									
			if(morph) q=calculate(i); else q.x=q.y=q.z=0;				<font color="#ffffaa">// 如果启用变形，则计算中间模型</font>
			helper.points[i].x-=q.x;					
			helper.points[i].y-=q.y;					
			helper.points[i].z-=q.z;					
			tx=helper.points[i].x;						<font color="#ffffaa">// 保存计算结果到x,y,z变量中</font>
			ty=helper.points[i].y;						
			tz=helper.points[i].z;					</pre>
</font><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/tl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/tc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/tr.png" height="28" width="28"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td background="Tutorial_25_files/l.png"><img src="Tutorial_25_files/l.png"></td>
    <td valign="top" width="100%">为了让动画开起来流畅，我们一共绘制了三个中间状态的点。让变形过程从蓝绿色向蓝色下一个状态变化。</td>
    <td background="Tutorial_25_files/r.png"><img src="Tutorial_25_files/r.png"></td></tr></tbody></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><img src="Tutorial_25_files/bl.png" height="28" width="28"></td><td width="100%"><img src="Tutorial_25_files/bc.png" height="28" width="100%"></td><td><img src="Tutorial_25_files/br.png" height="28" width="28"></td></tr></tbody></table>
<font color="#aaffaa" size="3"> 
</font><pre><font color="#aaffaa" size="3">			glColor3f(0,1,1);						<font color="#ffffaa">// 设置颜色</font>
			glVertex3f(tx,ty,tz);					<font color="#ffffaa">// 绘制顶点</font>
			glColor3f(0,0.5f,1);					<font color="#ffffaa">// 把颜色变蓝一些</font>
			tx-=2*q.x; ty-=2*q.y; ty-=2*q.y;				<font color="#ffffaa">// 如果启用变形，则绘制2步后的顶点</font>
			glVertex3f(tx,ty,tz);						
			glColor3f(0,0,1);						<font color="#ffffaa">// </font><font color="#aaffaa" size="3"><font color="#ffffaa">把颜色变蓝一些</font></font>
			tx-=2*q.x; ty-=2*q.y; ty-=2*q.y;				<font color="#ffffaa">// </font><font color="#aaffaa" size="3"><font color="#ffffaa">如果启用变形，则绘制2步后的顶点</font></font>
			glVertex3f(tx,ty,tz);						
		}									
	glEnd();									<font color="#ffffaa">// 绘制结束</font>