HP Visualize c200/c240 hp workstations - hp-ux 10.20 graphics administration g - Page 106
hp PEX Graphics Performance, Optimized vs. Normal 3D Performance, Rendering Conditions
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hp PEX Graphics Performance Optimized vs. Normal 3D Performance Rendering Conditions Performance Optimized For: Factors Affecting Performance: • 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 directional and positional light sources, plus ambient • Directional eyepoint (this is the default in • Any of the following ways of heavily interleaving changes: o Frequent attribute changes (e.g., hp PEX unless compliance mode is frequent changes of line color) enabled) relative to the number of primitives • Back-face culling off, or back-face culling being drawn on with supplied geometric normals o Frequent changes of the type of (culling usually results in a performance primitive (e.g., switching between improvement) Fill Areas and Polylines at a high • View clipping on frequency) • Isotropic modeling matrix (anglepreserving) • Color approximation type PEXColorSpace • OCC primitives • Packed or stride data format o Frequent changes of vertex attributes (i.e., the data being supplied with each vertex) o Frequent changes of modal state, such as: Double-buffering (especially MBX or DBE) HLHSR mode or ID Light sources enabled Depth cueing state Texture mapping state o Frequent switching between two or more active Renderers o Frequent mixing of Xlib and hp PEXlib 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 106 Graphics Administration Guide for HP-UX 10.20