ROLL

Format

ROLL(I, J)

Description

The ROLL function computes the third angle, in radians, of a body-3 Yaw-Pitch-Roll rotation sequence. Given two coordinate systems, I and J which are initially having the same orientation, this rotation sequence is defined as follows:

•	First, rotate in a counterclockwise direction about the z-axis of the I coordinate system [YAW].

•	Second, rotate counterclockwise about the negative y-axis of the I coordinate system [PITCH].

•	Third, rotate counterclockwise about the x-axis of the I coordinate system [ROLL].

The first argument, marker I, must be specified. The second argument, marker J, is optional.

Example

<Post_Request

comment = "Vehicle Orientation (degrees)"

id = "70000256"

type = "EXPRESSION"

expr1 = "NULL"

expr2 = "YAW(30301010,30101010)*RTOD"

expr3 = "PITCH(30301010,30101010)*RTOD"

expr4 = "ROLL(30301010,30101010)*RTOD"

Arguments

The marker whose rotational displacement is to be computed.

The marker with respect to which the rotational displacement is to be computed. This argument is optional. If omitted, it defaults to the ground coordinate system.

Comments

roll_comments_figure1