How do I tell if a cylinder is internal or external?

MBartlett21

How do I tell if a cylinder is internal or external?

konstantin_shiriazdanov

particulary for cylinder I beleve you could find for it cylAxis, cylRadius and cyl_face_normal_line, and based on the fact that onshape always return external normals define a

testPoint = cyl_face_normal_line.origin + cyl_face_normal_line.direction * cylRadius

you bacically translate the point of cyl face in the direction of external normall and then check if the translated point is on the cyl axis by test = tolerantEdquals(evDistance(...., testPoint, cylAxis), 0 )

if test is true the cylinder is internal, else - external

MBartlett21

I could also use the code below, I just realised.

tolerantEquals(testPoint, project(cylAxis, testPoint));

It may be a little faster.

konstantin_shiriazdanov

particulary for cylinder I beleve you could find for it cylAxis, cylRadius and cyl_face_normal_line, and based on the fact that onshape always return external normals define a

testPoint = cyl_face_normal_line.origin + cyl_face_normal_line.direction * cylRadius

you bacically translate the point of cyl face in the direction of external normall and then check if the translated point is on the cyl axis by test = tolerantEdquals(evDistance(...., testPoint, cylAxis), 0 )

if test is true the cylinder is internal, else - external

MBartlett21

I could also use the code below, I just realised.

tolerantEquals(testPoint, project(cylAxis, testPoint));

It may be a little faster.