Real-Time Visualization and Geometry Reconstruction of Large Oil and Gas Boreholes Based on Caliper Database - Visual Computing: Scientific Visualization and Imaging Systems - page 236

Fig. 13.7 Drawn in red is
the original data acquired
from the six-arms caliper
control points. In blue is an
approximation representation
created with an interpolation
of a closed natural cubic
splines
13.3.3.4 Inclusion of the Rotation in DEVI
DEVI value defines the sonde deviation from the surface. Combined with HAZI,
it's used to determine the tool's inclination and direction.
13.3.3.5 Inclusion of the Rotation in HAZI
HAZI tells the borehole angle with the earth's magnetic north. This value, com-
bined with DEVI, allows finding out tool's inclination and direction.
13.4 Optimization
Optimizations are necessary in order to keep the visualization system running in
real-time at acceptable frame rates. This section describes some techniques used
for this purpose for this work.
13.4.1 Level of Detail
Due to the common large size of the boreholes, it is not practical to render its
entire geometry in every frame. This could easily lead to GPU memory overflow
and even if memory is not an issue, processing time should still be taken into