HP Visualize J5000 hp workstations - hp-ux 10.20 graphics administration guide - Page 112

Optimized vs. Normal 3D Performance, Performance Optimized For, Factors Affecting Performance

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Starbase Graphics Performance Optimized vs. Normal 3D Performance Performance Optimized For: Factors Affecting Performance: Rendering Conditions • Best: up to 8 directional light sources, plus • A total of more than 8 directional and ambient positional light sources cause a noticeable • Good: a mixture of up to 8 directional and performance degradation positional light sources, plus ambient • Picking • Directional eyepoint set with view_point • Any of the following ways of heavily • Back face culling off, or back face culling interleaving changes: on with supplied geometric normals o Frequent attribute changes (e.g., • View clipping on • Isotropic modeling matrix (angle- preserving) • shade_mode set to CMAP_FULL frequent changes of line color) relative to the number of primitives being drawn o Frequent changes of the type of primitive (e.g., switching between polygons with polylines at a high frequency) o Frequent changes of vertex format (i.e., the data being supplied with each vertex) o Frequent changes of modal state, such as: Double-buffering Z-buffering Shade mode Light sources enabled Depth cueing state Texture mapping state o Frequent switching between two or more file descriptors o Frequent mixing of Xlib and Starbase calls • Redundant or unnecessary setup (e.g. setting attributes that are not relevant to the primitives being drawn) • Deformation on • Model clipping on • HLHSR in software via PowerShade (on unaccelerated graphics devices) Page 112 Graphics Administration Guide for HP-UX 10.20

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Starbase Graphics Performance
Optimized vs. Normal 3D Performance
Performance Optimized For:
Factors Affecting Performance:
Rendering Conditions
•
Best: up to 8 directional light sources, plus
ambient
•
Good: a mixture of up to 8 directional and
positional light sources, plus ambient
•
Directional eyepoint set with
view_point
•
Back face culling off, or back face culling
on with supplied geometric normals
•
View clipping on
•
Isotropic modeling matrix (angle-
preserving)
•
shade_mode
set to
CMAP_FULL
•
A total of more than 8 directional and
positional light sources cause a noticeable
performance degradation
•
Picking
•
Any of the following ways of heavily
interleaving changes:
o
Frequent attribute changes (e.g.,
frequent changes of line color)
relative to the number of primitives
being drawn
o
Frequent changes of the type of
primitive (e.g., switching between
polygons with polylines at a high
frequency)
o
Frequent changes of vertex format
(i.e., the data being supplied with
each vertex)
o
Frequent changes of modal state,
such as:
Double-buffering
Z-buffering
Shade mode
Light sources enabled
Depth cueing state
Texture mapping state
o
Frequent switching between two or
more file descriptors
o
Frequent mixing of Xlib and
Starbase calls
•
Redundant or unnecessary setup (e.g.
setting attributes that are not relevant to the
primitives being drawn)
•
Deformation on
•
Model clipping on
•
HLHSR in software via PowerShade (on
unaccelerated graphics devices)
Graphics Administration Guide for HP-UX 10.20
Page 112