angle between two vectors with sign

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Gilles asked May 9, '24 Gilles commented May 10, '24

angle between two vectors with sign

hello team,

I have two vectors, the first vector is the direction of a conveyor (direction). the second vector is the orientation of a queue (orientation). I would like to rotate the queue so that its orientation is aligned with the direction of the conveyor.

to get the angle between the two vectors, I do: angle = orientation.angle(direction).

then to rotate the queue in order to align its orientation, I do : obj.setRotation(0,0,angle );

as you can see on the image above, it does not work in all scenarios. what I found is, if I do angle = direction.angle(orientation), I get the same result as angle = orientation.angle(direction). so it does not capture sign of the angle, in other words, it does not capture the information if I am in clock direction or counter clock direction.

I will appreciate a help with this.

Thanks!

Software Version:

FlexSim 23.1.0

rotation vec3 angle

queue-orientation.png (123.7 KiB)

· 3

Joerg Vogel commented · May 09 at 04:50 AM

@Gilles , what if you do a projection of an moved item on a conveyor to gather your data to get angle of alignment. A conveyor is defined by start position to end position. It is not a typical location, rotation and size matrix like other objects. But an item owns this data again.

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Gilles Joerg Vogel commented · May 09 at 03:56 PM

hi Joerg,

what you explained is not the problem I am trying to solve. I am not worried about an item moving on a conveyor.

I am creating a 3d model, using a code. creating object and placing them in the right location and rotate them if necessary. As I explained, when I place a queue, as you can see on the image, I want to rotate that queue so that it has the same orientation with the divert. in some cases it works and in some it does not work. because I don't know how to get if the angle is in the clock direction or is counter clock direction.

Is there any command which can provide angle between two vectors with the angle direction?

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Joerg Vogel Gilles commented · May 09 at 09:53 PM

@Gilles, did you test this with Vec2 class, too?

https://docs.flexsim.com/en/23.1/Reference/CodingInFlexSim/FlexScriptAPIReference/Data/Vec2.html

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Answer 1 · 2024-05-10T11:45:32Z

Joerg Vogel answered May 10, '24 Gilles commented May 10, '24

Here is an example to get rotation values in a range of ]-180 .. 0 .. +180[

angle_project_plus_minus_180.fsm

Vec3 Vec3test = Vec3(0,0,0).projectRotation(variable,model()); //variable = object
double ang = Vec3test.z;

rotate-projected-smaller.gif (5.4 MiB)

angle-project-plus-minus-180.fsm (32.4 KiB)

· 1

Gilles commented · May 10 at 03:26 PM

perfect! this is exactly what I was looking for.

Thank you!

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