HP Visualize c200/c240 hp workstations - hp-ux 10.20 graphics administration g - 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