CAD tip # 13668:

Question

CAD

% platform category

How to create a sphere from 4 points in AutoCAD?

The CIRCLE command in AutoCAD has a "3 points" option for constructing a circle from three points, but the SPHERE command does not offer a corresponding "4 points" option by default. You must specify the coordinates of the center and radius of the sphere.

But you can solve this using a simple LISP utility 3Psphere which adds this construction tool to AutoCAD.

Download the 4Psphere from Download, load it into AutoCAD using APPLOAD and type the 4PSPHERE command. Now specify the four known points of the sphere (by pointing with osnap mode, entering coordinates, etc.). These 3D points must not be collinear or coplanar. The utility constructs a sphere passing through the four points and displays the value of the center coordinate and radius of the constructed sphere.

ACAD

*CAD

20.3.2023 8980×

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applies to: AutoCAD ·

See also:
Tip 14095:	How to increase the accuracy (smoothness) of STL files exported from AutoCAD?
Tip 12034:	SolSimilar - select geometrically similar 3D solids.
Tip 9512:	How to convert a point cloud to an editable 3D CAD model (mesh)?
Tip 9042:	Random scatter of AutoCAD drawing objects - SCATTER.
Tip 8903:	Draw normals of 3DFaces in AutoCAD DWG.

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