topic Re: How to accurately project a 2d shape into 3d model. in AutoCAD Forum

How to accurately project a 2d shape into 3d model.

marcos9593 — Tue, 11 Jan 2022 04:05:33 GMT

I am having trouble using PROJECTGEOMETRY on a 2d shape against a 3d solid accurately. I have a piece of Velcro that I want to make a curved cavity for. The purpose is to join a dimensioned Velcro piece onto a plastic cover, like a jig/fixture. My results are coming out distorted, the cavity is smaller and doesn’t allow the Velcro to fit inside. How???

Re: How to accurately project a 2d shape into 3d model.

Valentin_CAD — Tue, 11 Jan 2022 13:18:14 GMT

@marcos9593 ,

Provide your drawing with the 3D and 2D geometry.

Consider this link:

PROJECTGEOMETRY (Command)

Re: How to accurately project a 2d shape into 3d model.

marcos9593 — Wed, 12 Jan 2022 01:31:32 GMT

Hello Valentin,

I attached a short clip of the PROJECTGEOMETRY, this is what i want however, i need to figure out how to make the projection to scale; 3D printed model with the projection command but the cavity is stretched rather than a natural bend into the 3D model. Could there be a different way to bend the 2d profile.

Thanks for the help!

Kind regards,

Re: How to accurately project a 2d shape into 3d model.

schulz8NPAP — Wed, 12 Jan 2022 11:17:26 GMT

Perhaps something like this??

Regards

Jochen

Re: How to accurately project a 2d shape into 3d model.

Valentin_CAD — Wed, 12 Jan 2022 14:15:03 GMT

@marcos9593 ,

@marcos9593 wrote:
I am having trouble using PROJECTGEOMETRY on a 2d shape against a 3d solid accurately. ...
how to make the projection to scale. ...

PROJECTGEOMETRY is limited on projecting to scale. I thought about "Parametric", but this is a technology that is used for designing with constraints, which are associations and restrictions applied to 2D geometry. (Link)

I believe another Autodesk software could be more suitable - something like Inventor (See Bend Command) or Revit.

Re: How to accurately project a 2d shape into 3d model.

leeminardi — Wed, 12 Jan 2022 15:44:33 GMT

Would it be more accurate to say you want to "wrap" and not "project" the 2D geometry onto a cylinder? If so then if the length of the 2D shape is L and the radius of the cylinder is R then S = L and the angle subtended is S/R radians.

Re: How to accurately project a 2d shape into 3d model.

marcos9593 — Wed, 12 Jan 2022 16:05:36 GMT

Hello! How did you do that?? Regards,

Re: How to accurately project a 2d shape into 3d model.

marcos9593 — Wed, 12 Jan 2022 16:09:01 GMT

Good morning,

yes, in this case it seems more of a wrapping Of the 2d shape but the method remains unknown. Any ideas?
thanks for all the help!

kind regards,

Re: How to accurately project a 2d shape into 3d model.

schulz8NPAP — Wed, 12 Jan 2022 17:55:10 GMT

Hello and thank you for your interest.

Attached ist the continent of Africa (3DSolid onto a bulb-formed earth 😉 )

You can reach me by

www.black-cad.de

Regards from Germany

Yours Jochen