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added not about wrong winding of teapot vertices, as is in the original

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1215 7f0cb862-5218-0410-a997-914c9d46530a
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dcnieho 2012-03-26 13:51:15 +00:00
parent 299390347d
commit c7016dc648
1 changed files with 17 additions and 2 deletions
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19
freeglut/web-src/docs/api.php
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@ -2036,8 +2036,23 @@ draw a wireframe and solid teapot respectively.
<p><b>Description</b></p> <p><b>Description</b></p>
<p>The <tt>glutWireTeapot</tt> and <tt> <p>The <tt>glutWireTeapot</tt> and <tt>
glutSolidTeapot</tt> functions render a teapot of the desired size, centered glutSolidTeapot</tt> functions render a teapot of the desired size,
at the origin. This is the famous OpenGL teapot [add reference]. </p> centered at the origin. This is the famous OpenGL teapot [add
reference]. </p>
<p><b>Bugs</b></p>
<p>OpenGL's default <tt>glFrontFace</tt> state assumes that front facing
polygons (for the purpose of face culling) have vertices that wind
counter clockwise when projected into window space. This teapot is
rendered with its front facing polygon vertices winding clockwise. For
OpenGL's default back face culling to work, you should use:</p>
<p><tt>&nbsp;&nbsp;glFrontFace(GL_CW);<br>
&nbsp;&nbsp;glutSolidTeapot(size);<br>
&nbsp;&nbsp;glFrontFace(GL_CCW);</tt></p>
<p>Both these bugs reflect issues in the original aux toolkit's teapot
rendering routines (GLUT used the same teapot rendering routine).</p>
<p><b>Changes From GLUT</b></p> <p><b>Changes From GLUT</b></p>