Return x_pointing and y_pointing vectors as expressions from the yaw, pitch, and roll input (as strings).
- Parameters:
- yaw
str String expression for the yaw angle (rotation about Z-axis)
- pitch
str String expression for the pitch angle (rotation about Y-axis)
- roll
str String expression for the roll angle (rotation about X-axis)
- Returns:
- [
x_pointing, y_pointing] vector expressions.