HP Visualize J5000 hp workstations - hp-ux 10.20 graphics administration guide - Page 109

hp-PHIGS Graphics Performance, Optimized vs. Normal 3D Performanc, Performance Optimized

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hp-PHIGS Graphics Performance Optimized vs. Normal 3D Performance Performance Optimized For: Factors Affecting Performance: Rendering Conditions • Light Sources: • A total of more than 8 directional and o Best: up to 8 directional light positional light sources cause a noticeable sources, plus ambient performance degradation o Good: a mixture of up to 8 • Picking (including direct pick and logical directional and positional light sources, plus ambient • Directional eyepoint, set via: o pescape_u230/pgse_u3 (C), pue230/pus003 (FORTRAN) • Back face culling off, or back face culling on with supplied geometric normals • View clipping on, set via: o pset_view_rep (C), psvwr (FORTRAN) • True colour mapping in a direct colour environment • Isotropic modeling matrix (anglepreserving) device picking) • Any of the following ways of heavily interleaving changes: o Frequent attribute changes (e.g., frequent changes of line colour) relative to the number of primitives being drawn o Frequent changes of the type of primitive (e.g., switching between Fill Areas and 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: HLHSR mode or ID Colour mapping method Light sources enabled Depth cueing state o Frequent switching between two or more active workstations o Frequent mixing of Xlib and hp- PHIGS calls • Redundant or unnecessary setup (e.g. setting attributes that are not relevant to the primitives being drawn) • Model clipping on • HLHSR in software via PowerShade (on unaccelerated graphics devices) Page 109 Graphics Administration Guide for HP-UX 10.20

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hp-PHIGS Graphics Performance
Optimized vs. Normal 3D Performanc
e
Performance Optimized For:
Factors Affecting Performance:
Rendering Conditions
•
Light Sources:
o
Best: up to 8 directional light
sources, plus ambient
o
Good: a mixture of up to 8
directional and positional light
sources, plus ambient
•
Directional eyepoint, set via:
o
pescape_u230/pgse_u3
(C),
pue230/pus003
(FORTRAN)
•
Back face culling off, or back face culling
on with supplied geometric normals
•
View clipping on, set via:
o
pset_view_rep
(C),
psvwr
(FORTRAN)
•
True colour mapping in a direct colour
environment
•
Isotropic modeling matrix (angle-
preserving)
•
A total of more than 8 directional and
positional light sources cause a noticeable
performance degradation
•
Picking (including direct pick and logical
device picking)
•
Any of the following ways of heavily
interleaving changes:
o
Frequent attribute changes (e.g.,
frequent changes of line colour)
relative to the number of primitives
being drawn
o
Frequent changes of the type of
primitive (e.g., switching between
Fill Areas and 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:
HLHSR mode or ID
Colour mapping method
Light sources enabled
Depth cueing state
o
Frequent switching between two or
more active workstations
o
Frequent mixing of Xlib and hp-
PHIGS calls
•
Redundant or unnecessary setup (e.g.
setting attributes that are not relevant to the
primitives being drawn)
•
Model clipping on
•
HLHSR in software via PowerShade (on
unaccelerated graphics devices)
Graphics Administration Guide for HP-UX 10.20
Page 109