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How can face of cornice be extruded along a given profile 'P' ?

I've used knife tool to cut the long profile at 45 degrees and the assemble them together but process is long?enter image description here

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Try using a curve as a bevel object.

1- Create a curve with the shape you want to use as bevel. enter image description here

2- Create a different curve as a new object for the shape you want that bevel object to follow

enter image description here

3- With the newly created curve selected, go to the curve menu and select the curve you want to use as bevel object and adjust the bevel depth.

enter image description here

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    $\begingroup$ i always struggle to get the curve to have "sharp corner" @ 90 degrees. How Were you able to achieve that at "step 2"? as far as i know the breizer curve can only have smooth angles. $\endgroup$ Dec 9, 2014 at 4:35
  • $\begingroup$ @NareshVijh You can make a bezier curve be smooth or sharp by changing the handle type. There are four Bezier curve handle types you can use, to select one press V. For 90 degree turns you can use vector. See: wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/… $\endgroup$
    – user1853
    Dec 9, 2014 at 8:03
  • $\begingroup$ now i get it. thanks. But, i don't know why.... whenever i extrude it along the path that curve $\endgroup$ Dec 9, 2014 at 12:47
  • $\begingroup$ @NareshVijh you can post a new question $\endgroup$
    – user1853
    Dec 9, 2014 at 14:48
  • $\begingroup$ @cegaton Whenever i extrude it along the path that curve moulding doesn't face towards desired orientation? $\endgroup$ Dec 10, 2014 at 5:02

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