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# 23 Actions

 Jan21 awarded Yearling Jun2 accepted Orientation matrix for three points in the plane May31 revised Orientation matrix for three points in the plane typo May30 awarded Student May30 asked Orientation matrix for three points in the plane Feb10 comment Smallest enclosing cylinder for an irregular body Just ran across this an thought I'd leave it here for future reference: geometrictools.com/Documentation/CylinderFitting.pdf Jan23 comment Computing surface normal, floating point arithmetic Thanks for the reply! I asked around at some other locations, and several people pointed me to this algorithm: cs.haifa.ac.il/~gordon/plane.pdf, You might be interested in having a look. There's an additional explanation here: cs.berkeley.edu/~ug/slide/pipeline/assignments/… Jan23 awarded Scholar Jan23 accepted Computing surface normal, floating point arithmetic Jan22 comment Computing surface normal, floating point arithmetic @ZevChonoles I wasn't sure if dls was correct in saying that it would be more appropriate for the Scientific Computing site, so I flagged it. Jan22 awarded Citizen Patrol Jan22 comment Computing surface normal, floating point arithmetic The vertices are exported from a modeling program, and stored as 32 bit floats. I understand that error is unavoidable, but I was wondering if there is a method to ensure that the error is as small as possible - it seems that some choices ought to be better than others? Jan21 asked Computing surface normal, floating point arithmetic Nov28 comment Smallest enclosing cylinder for an irregular body Do you have an application in mind, and are you working in a particular language? Nov21 comment Check if point on circle is in between two other points (Java) I'm somewhat confused about what exactly you want. Are you looking for a function that will take in 3 points which are known to be on the circle, and classify one of them by its position relative to the other two? Is this in $\mathbb{R^2}$ or $\mathbb{R^3}$? Are they in rectangular or polar coordinates? Nov21 revised Line and plane intersection in 3D fixed spelling Nov21 awarded Editor Nov21 revised Line and plane intersection in 3D edited body Nov21 answered Line and plane intersection in 3D Nov18 awarded Teacher