WellCAD Basics - Advanced Logic Technology

APPENDIX A - 445
Select the log that will be used as the Amplitude component of the 3D log from the
drop down list. The combo box is pre-filled with possible choices. These are None,
which means that the cylinder surface color will be constant, or Well Logs, Formula
Logs and Image Logs present in the borehole document.
Lightning:
The illusion of the three dimensions is largely due to the effect of the lighting. The
lighting effect is composed of two independent white lights. The first one is an
Ambient light which illuminates the object in a non-directional manner, producing
the same amount of light for all directions. The second light is a Spot light. It
illuminates the object with a directional beam of light. The spot light is situated in
the vertical plane containing the axis of the cylinder and the observer.
The lighting settings can be changed using the 3D log lighting settings dialogue box.
The amplitude of the Ambient light and of the Spot light can be controlled
independently using the two intensity sliders. The maximum light intensity is
produced when the slider is in the topmost position. The spot light angle is
controlled with the V.pos slider. When the slider is in the middle position, the spot
beam is horizontal. When the slider is in topmost position the spot beam is almost
vertical, illuminating the object with a top to bottom light beam.
Most often a light configuration as shown below is used.
Commonly used lighting set up