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Hi, 
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originally asked bf-funboard if a Spin Modifier (like Carrara's) could be added to a future Blender. 
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Prashant replied: 
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<span>"Actually, this is already possible in just two steps: to the rotation</span>
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<span>channel of any object in the graph editor, add the 'Generator' modifier and</span>
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<span>specify a suitable linear polynomial (which is set by default, so you</span>
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<span>already have your spin behaviour!)</span>
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<span>This method is probably superior to having a separate object modifier,</span>
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<span>because it already offers you better control over which frame range the</span>
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<span>effect will be applied to, among other things."</span>
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<span> </span>
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<span>I couldn't find the Generator Modifier, though found a ref in the Wiki, but it wasn't clear....i.e. looked in the<br/>Object Properties under Add Modifier.....finally found it when I made the f-curve properties visible. </span>
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<span>Douglas Knapp suggested: </span>
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"You might want to contact the wiki/doc team and give it them. I am
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<span><span>sure they would love to have it!" </span></span>
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<span><span> </span></span>
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<span><span> </span></span>
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<span><span>So would like to ask if the Wiki could be updated:</span></span>
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http://wiki.blender.org/index.php/Doc:2.6/Manual/Animation/Editors/FModifiers#Generator
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<span><span> </span></span>
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<h2><span class="mw-headline">"Adding a Modifier</span></h2>
<p>The F-curve modifier panel is located in the Properties panel. Select a curve by selecting one of its curve points, or by selecting the channel list. Click on the <span class="hotkey">Add Modifier</span> button and select a modifier."  </p>
<p><span style="color: #0000ff;"><strong> </strong></span></p>
<p><span style="color: #0000ff;"><strong>Add:  </strong></span></p>
<p><span style="color: #0000ff;">To add spin to an object or group, select the object/group and add a keyframe to the axis of rotation (x,y, or z)</span></p>
<p><span style="color: #0000ff;">Go to the Graph Editor.....make sure the f-curves properties panel is visible (View > Properties) </span></p>
<p><span style="color: #0000ff;">>Add Modifier > Generator </span></p>
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<p>Please let me know if there is a different group I should send this to, or if there is a form<br/>I should use instead. </p>
<p>Best regards, <br/>Cal McGaugh</p>
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