Face to Face Loft Examples

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Menu: Insert / 3D Object / Face2Face Lofting
Insert a 3D object by connecting 2 faces.

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Face to face lofting is carried out on Acis objects but although it will work on Acis surface objects the results may not be what was expected (explained later), Acis starts to loft tangency through the edges of adjacent faces (Thanks to Murray Dickinson for that information) and produces a smooth transition, which means if you wish the loft to go directly at 45 degrees to the face you would need to use standard lofting techniques.
Fig 1

One thing to note when using face to face loft to create the bend for a pipe, is that it may not create the desired curvature on the bend, this is best explained in a picture, the two red circles in the image below are what one could expect the curvature of the pipe to be at an elbow, however as can be seen Acis takes a slightly different path, whilst in most cases this is totally acceptable, if one is producing accurate 2D drawings (by using the drafting palette) then standard lofting techniques may be preferable.
Fig 2

Another example of how Acis creates the loft can be seen below in Fig 3. the image on the left shows one of the objects has been chamfered, this prevent Acis from carrying out the loft, one cure is to ‘pull’ out the face slightly giving the desired edge for the loft to be completed.
Fig 3

In this example we will draw a drawer handle, however there is one point that needs to be taken into account, in that Acis can’t loft ‘face to face’ if the said faces are in the same plane, or opposed to each other, to get round this they are angled towards each other, however simply angling the top face can also produce an error, angling one or both of the objects allows it to loft.
Fig 4 and 5
Image Image

In this example a circle and polygon (hexagonal) was extruded to the desired height, but it could just as easily be a cylinder and polygon prism. As the faces are in the same plane they need to be rotated slightly to prevent an error occurring, therefore rotate ‘Y’ axis in this case, for the circle 1 degree, and the hexagon -1 degree (or whatever figures you prefer), the corners are blended to produce a smooth appearance with the inside edge given a larger blend, Fig 6 right.
Fig 6

Activate ‘face to face’ loft tool and click the two top faces to create the loft fig 7, TC will automatically create the loft after the second face is clicked, and the result will be a a complete single acis object consisting of the two original objects and the loft.
Fig 7
Fig 8
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Page last modified on Monday 23 of May, 2016 02:08:48 PDT by AndyUK.