# Reference axis in universal and sperical joints

Dear Soren:

I have a simple question about the reference axis in universal or
spherical joints. For example, the joint is defined as:

AnyUniversalJoint MCP =
{ Axis1 = y;
Axis2 = z;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

AnySphericalJoint MCP =
{ Orientation.Type = RotVector;
Orientation.Axis1 = y;
Orientation.Axis2 = z;
Orientation.Axis3 = x;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

My question is about the reference frame of the Axis1,2,3; are they
defined on Body_A, Body_B, or in the global reference frame?

Regards,

John Wu

Dear John

These axes are defined in the first mentioned reference frame of the joint,
so in this case it will be the Body_A reference.

Best regards

SÃ¸ren, AnyBody Support

From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of johnzengwu
Sent: 09 January 2009 16:19
To: anyscript@yahoogroups.com
Subject: [AnyScript] Reference axis in universal and sperical joints

Dear Soren:

I have a simple question about the reference axis in universal or
spherical joints. For example, the joint is defined as:

AnyUniversalJoint MCP =
{ Axis1 = y;
Axis2 = z;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

AnySphericalJoint MCP =
{ Orientation.Type = RotVector;
Orientation.Axis1 = y;
Orientation.Axis2 = z;
Orientation.Axis3 = x;
AnyRefNode &Body_A = …Body_A.P_A;
AnyRefNode &Body_B = …Body_B.P_B;
};

My question is about the reference frame of the Axis1,2,3; are they
defined on Body_A, Body_B, or in the global reference frame?

Regards,

John Wu

[Non-text portions of this message have been removed]

Soren:

Thanks!

John

— In anyscript@yahoogroups.com, AnyScript Support
<anyscriptsup@…> wrote:
>
> Dear John
>
>
>
> These axes are defined in the first mentioned reference frame of
the joint,
> so in this case it will be the Body_A reference.
>
>
>
> Best regards
>
> SÃ¸ren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of johnzengwu
> Sent: 09 January 2009 16:19
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Reference axis in universal and sperical joints
>
>
>
> Dear Soren:
>
> I have a simple question about the reference axis in universal or
> spherical joints. For example, the joint is defined as:
>
> AnyUniversalJoint MCP =
> { Axis1 = y;
> Axis2 = z;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> AnySphericalJoint MCP =
> { Orientation.Type = RotVector;
> Orientation.Axis1 = y;
> Orientation.Axis2 = z;
> Orientation.Axis3 = x;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> My question is about the reference frame of the Axis1,2,3; are they
> defined on Body_A, Body_B, or in the global reference frame?
>
> Regards,
>
> John Wu
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

Soren:

Thanks!

John

— In anyscript@yahoogroups.com, AnyScript Support
<anyscriptsup@…> wrote:
>
> Dear John
>
>
>
> These axes are defined in the first mentioned reference frame of
the joint,
> so in this case it will be the Body_A reference.
>
>
>
> Best regards
>
> SÃ¸ren, AnyBody Support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of johnzengwu
> Sent: 09 January 2009 16:19
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Reference axis in universal and sperical joints
>
>
>
> Dear Soren:
>
> I have a simple question about the reference axis in universal or
> spherical joints. For example, the joint is defined as:
>
> AnyUniversalJoint MCP =
> { Axis1 = y;
> Axis2 = z;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> AnySphericalJoint MCP =
> { Orientation.Type = RotVector;
> Orientation.Axis1 = y;
> Orientation.Axis2 = z;
> Orientation.Axis3 = x;
> AnyRefNode &Body_A = …Body_A.P_A;
> AnyRefNode &Body_B = …Body_B.P_B;
> };
>
> My question is about the reference frame of the Axis1,2,3; are they
> defined on Body_A, Body_B, or in the global reference frame?
>
> Regards,
>
> John Wu
>
>
>
>
>
> [Non-text portions of this message have been removed]
>