3.3. Euler transformation #
An Euler transformation is done with three counterclockwise
object rotations around following the axes:
x-axis, y-axis, or
z-axis. Use cases are:
spherical object transformations
spherical coordinates transformations
The input syntax of an Euler transformation is:
angle1, angle2, angle3 [, axes ]
where axes is an optional 3 letter code
with letters : X, Y, or
Z. Default is ZXZ.
angleN is any valid angle with the input
format RAD, DEG, or
DMS.
To do a transformation, you have to use a transformation operator (see Section 5.10).
Example 3.5. Create a transformation object
Create a transformation object to rotate a spherical object
counterclockwise, first 20° around the
x-axis, second -270° around the
z-axis and last 70.5° around the
y-axis.
sql> SELECT strans '20d, -270d, 70.5d, XZY';
Example 3.6. Create a second transformation object
Create a transformation object to rotate a spherical object
counterclockwise, first
2° 20' around the z-axis, second 10°
around the x-axis, and last 0° around
the z-axis.
sql> SELECT strans '2d 20m, 10d, 0';