GLULOADSAMPLINGMATRICES(3G)

💅 GLULOADSAMPLINGMATRICES 💅

okay bestie, sit down, we're talking about gluLoadSamplingMatrices from the 3G manual section, and honestly? she's a quiet icon. no cap.

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✨ NAME ✨

gluLoadSamplingMatrices — load NURBS sampling and culling matrices

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🎀 C SPECIFICATION 🎀

void gluLoadSamplingMatrices( GLUnurbs* nurb,
                              const GLfloat *model,
                              const GLfloat *perspective,
                              const GLint *view )

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🌸 PARAMETERS 🌸

• nurb — the NURBS object in question, and yes she has to be the one created with gluNewNurbsRenderer. your girl needs an actual home, okay?
• model — a modelview matrix. the kind you'd pull out of a glGetFloatv call.
• perspective — a projection matrix. also the kind you'd get from a glGetFloatv call. twinning with model fr fr.
• view — a viewport. this one comes from a glGetIntegerv call, not glGetFloatv, so don't get it twisted 💀.

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🦋 DESCRIPTION 🦋

so gluLoadSamplingMatrices takes model, perspective, and view and uses them to recompute the sampling and culling matrices that live inside nurb. that's the whole job. that's her moment. periodt.

the sampling matrix is the one that decides how finely a NURBS curve or surface has to be tessellated — like, how many little pieces we're chopping her into — so that everything satisfies the sampling tolerance. that tolerance is determined by the GLU_SAMPLING_TOLERANCE property, iykyk.

the culling matrix, meanwhile, is what gets consulted when deciding whether a NURBS curve or surface should be culled before rendering. that only matters when the GLU_CULLING property is turned on. no culling property, no culling drama 💅.

now here's the tea: you only need gluLoadSamplingMatrices if the GLU_AUTO_LOAD_MATRIX property is turned off (peep gluNurbsProperty for that one). leaving GLU_AUTO_LOAD_MATRIX turned on is convenient, sure, and it's giving easy. but bestie, there can be a performance penalty for doing so. why? because a round trip to the GL server is needed to fetch the current values of the modelview matrix, the projection matrix, and the viewport. every. single. time. 😭

so like — convenient, or fast. pick your fighter. the manpage is just saying the tradeoff exists, not which one to choose 🫶

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👑 SEE ALSO 👑

• gluGetNurbsProperty(3G)
• gluNewNurbsRenderer(3G)
• gluNurbsProperty(3G)

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and that's the whole page, bestie!! go forth and load those matrices, main character energy only ✨💖🌈

signing off from the GLULOADSAMPLINGMATRICES(3G) footer, 3G manual, exactly as she came to me — no dates, no version, just vibes and a title that slaps 🎀