Skew by Bounding box

[jules_nz]

Hi everyone
Hopefully someone can point me int he right direction.
I have an object I want to make fatter at one end

To help you understand image a egg, and take the bottom half of that egg and make it bigger, but the top half has to stay exactly as it is
It is possible to manipulate a file in this manner? Maybe to skew it using only four points in a bounding box??
And if so which program out there is most suitable?

I have used Blender, Tinkercad, Autodesk 123d, Meshmixer, Meshlab and Daz
But I just cant seem to get any of these programs to do what I want to do

Anyhelp would be most appreciated
Cheers
Julie

[Roxy]

Well.... In OpenScad I would make a 2 dimensional object and extrude it at different rates as I moved through the 3rd axis. And that extrusion (or offset) number can be the result of a function so you can make it do what ever you want.

[jules_nz]

I already have the object that I want to tweak
Never mind, I guess it can't be done - so back to the drawing board
Thanks anyway

[robosmith]

It can be done in Sketchup with the FredoScale plugin tools.

[jules_nz]

I had a play in Sketchup, but it doesn't look like Sketchup can import STL or OBJ files. So I don't think I can get my file in there

[LambdaFF]

While you could easily cut your model in 2, keep the upper part and then redo the lower half, you will soon reach a limit of what you can do with an STL : it will be very difficult to create a seamless integration. What I mean is however hard you try, it will be close to impossible to do a mesh that will have the correct tangence at the seam (see picture below, I kept your eggcellent example).
It would be much better if you worked with a parametric (engineering) CAD software. Because a proper engineering software allows you that kind of modifications.

egg story.jpg

[robosmith]

Sketchup can import STL with the STL plugin.


But your egg is simple enough to get better results by drawing it from scratch.

I had a play in Sketchup, but it doesn't look like Sketchup can import STL or OBJ files. So I don't think I can get my file in there