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lang=EN-US><o:p></o:p></SPAN></SPAN></B></A></P><SPAN
style="mso-bookmark: 高洛德着色"></SPAN>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">当<SPAN
lang=EN-US>Direct3D使用高洛德着色渲染一个多边形时，它根据顶点法向和光照参数为每个顶点计算颜色。然后，贯穿多边形的表面对颜色进行插值。插值是线性的。例如，如果顶点1的颜色的红色分量为0.8，顶点2的颜色的红色分量为0.4，如果使用高洛德着色模式和RGB颜色模型，那么Direct3D光照模块会把红色分量0.6赋给位于这两个顶点连线中点处的像素。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">下图显示了高洛德着色。茶壶由许多平直的三角形组成。但是，高洛德着色使物体的表面看起来是弯曲和光滑的。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><!--[if gte vml 1]><v:shape
id=_x0000_i1030 style="WIDTH: 83.4pt; HEIGHT: 60.6pt" type = "#_x0000_t75"
coordsize = "21600,21600"><v:imagedata o:title="gourtea" src =
"Rendering_files/image002.gif"></v:imagedata></v:shape><![endif]--><![if !vml]><img border=0 width=111 height=81
src="Rendering_files/image002.gif" v:shapes="_x0000_i1030"><![endif]><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">高洛德着色也可以用于显示有清晰边缘的物体。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">更多信息请参阅<U>表面和顶点法向量</U>。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A
name=着色模式的比较><B><SPAN
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">着色模式的比较<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></B></A></P><SPAN
style="mso-bookmark: 着色模式的比较"></SPAN>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
<HR align=center width="100%" SIZE=1>
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<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">在平面着色模式中，下面显示的金字塔在相邻表面间会有清晰的边缘。但是在高洛德着色模式中，用于着色的值是贯穿边缘插值得到的，最终看起来是一个弯曲的表面。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><!--[if gte vml 1]><v:shape
id=_x0000_i1032 style="WIDTH: 201.6pt; HEIGHT: 130.8pt" type = "#_x0000_t75"
coordsize = "21600,21600"><v:imagedata o:title="shade2" src =
"Rendering_files/image003.gif"></v:imagedata></v:shape><![endif]--><![if !vml]><img border=0 width=269 height=174
src="Rendering_files/image003.gif" v:shapes="_x0000_i1032"><![endif]><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">高洛德着色使经过光照的平直表面看起来比平面着色更真实。平面着色模式中的表面具有相同的颜色，但高洛德着色能使光线更准确地照射在表面上。如果附近有点光源，那么这种效果特别明显。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">高洛德着色使在平面着色中明显可见的边缘变得光滑。但是，它会产生马克带（<SPAN
lang=EN-US>marc
band），这是在相邻多边形间没有平滑混合的颜色带或光带。应用程序可以通过增加物体中多边形的数量，或增大屏幕分辨率，或增加颜色深度来减少马克带效应。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">高洛德着色会漏掉一些细节。下图显示了这样一个例子，一个光照点完全被包含在多边形表面内。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><!--[if gte vml 1]><v:shape
id=_x0000_i1033 style="WIDTH: 216.6pt; HEIGHT: 120pt" type = "#_x0000_t75"
coordsize = "21600,21600"><v:imagedata o:title="gouraud" src =
"Rendering_files/image004.gif"></v:imagedata></v:shape><![endif]--><![if !vml]><img border=0 width=289 height=160
src="Rendering_files/image004.gif" v:shapes="_x0000_i1033"><![endif]><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">在这种情况下，在顶点间进行插值的高洛德着色将会完全漏掉光照点，表面的渲染就好像光照点不存在一样。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
<HR align=center width="100%" SIZE=1>
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<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A
name=设置着色模式><B><SPAN
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">设置着色模式<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></B></A></P><SPAN
style="mso-bookmark: 设置着色模式"></SPAN>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
<HR align=center width="100%" SIZE=1>
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<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">Microsoft®
Direct3D®允许在任一时刻选择一种着色模式。默认情况下选择高洛德着色。C++应用程序可以通过调用<U>IDirect3DDevice9::SetRenderState</U>方法改变着色模式。应该将<I
style="mso-bidi-font-style: normal">State</I>参数设为<U>D3DRS_SHADEMODE</U>。<I
style="mso-bidi-font-style: normal">Value</I>参数必须被设为<U>D3DSHADEMODE</U>枚举类型的成员。以下示例代码显示了如何将Direct3D应用程序当前的着色模式设置为平面或高洛德着色模式。<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">//</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
设置为平面着色。</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">//</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
本示例代码假设pDev是一个指向IDirect3DDevice9接口的有效指针。 </SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">hr
= pDev->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_FLAT);<o:p></o:p></SPAN></P>
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style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">if(FAILED(hr))<o:p></o:p></SPAN></P>
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style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">{<o:p></o:p></SPAN></P>
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style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
这里是错误处理代码。</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">}<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p> </o:p></SPAN></P>
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style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">//</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
设置为高洛德着色。这是Direct3D的默认设置。</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">hr
= pDev->SetRenderState(D3DRS_SHADEMODE,<o:p></o:p></SPAN></P>
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style="mso-spacerun: yes">
</SPAN>D3DSHADE_GOURAUD);<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">if(FAILED(hr))<o:p></o:p></SPAN></P>
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style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">{<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
这里是错误处理代码。</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">}<o:p></o:p></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US
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<HR align=center width="100%" SIZE=1>
</SPAN></DIV>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A
name=呈现场景><B><SPAN
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">呈现场景<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></B></A></P><SPAN
style="mso-bookmark: 呈现场景"></SPAN>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US
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