Description:
The Projection module creates 2D projection of 3D object. The input object is rotated around
its center (nx/2+1,ny/2+1,nz/2+1) that the projection direction coincides with the positive Z-axis in
fixed space. Following this, every element is projected in the direction of the Z-axis on to the X-Y-plane
in fixed space, and distributed by means of linear interpolation with the four (two) neighbouring points of the projection array.
The tilt angles can either be typed in directly or derived form the current camera orientation.
When the tilt angles are derived from the camera orientation, the projection image will be calculated when
the Apply button is pressed or interactively when the camera orientation is changed. Otherwise the
calculation will start when the Apply button is pressed.
Note that a projection over phi and theta is equivalent to a rotation with 90 - phi, phi - 90, theta and a projection over 0, 0.
Ports:
Enter angles
This radio box defines whether the angles are derived from the current camera orientation or typed into the corresponding port
fields.
Mode
When this radio box is set to normal, the calculation will be started when the Apply button is pressed. Otherwise the
calculation will be started when the camera orientation has been changed.
The port is only visible, when the port Enter_Angles is set to from camera.
Phi, Theta
When the port Enter_Angles is set to by hand, these number fields are used to define the tilt angles. Otherwise
they are used to show the tilt angles derived from the camera orientation.
In plane rotation
When the projection angles are derived from the camera, an additional rotation of the projected image is done. The angle of this
rotation is shown in this port.
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