angle defined by two points

[Anonymous]

Could someone please help/remind me how I calculate the angle defined by two points which I have 

assigned to two variables - Point1 and Point2

Thanks 

George

[Ranjit_Singh]

(angle point1 point2)

This returns the angle in radians. I believe the angle is based on current UCS but I cannot verify at the moment. Also look into angtos for other formats.

[Anonymous · Accepted solution]

Great thanks - you fixed my mental block 🙂

[marko_ribar]

(angle p1 p2) function don't work in UCS, but it calculates angle through specified coordinates no matter what current UCS is...

[Anonymous]

Thanks Mark,

Do you mean that it only works in the World UCS - not a user defined one?   How do you get around this limitation?

Regards

George from New Zealand

[marko_ribar]

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@Anonymous wrote:

Thanks Mark,

Do you mean that it only works in the World UCS - not a user defined one?   How do you get around this limitation?

Regards

George from New Zealand

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I usually use (trans) function to obtain desired points from UCS to WCS or from WCS to UCS or alternatively to OCS or DCS - and only then, I, if I think that's correct way, use (angle) function... Note that angles obtained from (angle) are always {0.0-2pi} interval and 0.0 and 2pi radians are of those points that are left to right - vector is '(+XXX 0.0) - so (angle '(0.0 0.0) '(1.0 0.0)) = 0.0 (vector is '(+1.0 0.0))

[john.uhden]

If you want the angle in the WCS, then be safe...

(angle (trans Point1 1 0)(trans Point2 1 0))

If the UCS is the same as the WCS, then no transformation will take place,

so your result would be the same as

(angle Point1 Point2)