Signature
gluLoadSamplingMatrices(
GLUnurbs* (
nurb
)
,
const GLfloat * (
model
)
,
const GLfloat * (
perspective
)
,
const GLint * (
view
)
)-> void
gluLoadSamplingMatrices(
nurb
,
model
,
perspective
,
view
)
gluLoadSamplingMatrices( POINTER(GLUnurbs)(nurb), arrays.GLfloatArray(model), arrays.GLfloatArray(perspective), arrays.GLintArray(view) ) -> None
Parameters
| Variables | Description |
|---|---|
| nurb |
Specifies the NURBS object (created with
gluNewNurbsRenderer
).
|
| model |
Specifies a modelview matrix (as from a
glGetFloatv
call).
|
| perspective |
Specifies a projection matrix (as from a
glGetFloatv
call).
|
| view |
Specifies a viewport (as from a
glGetIntegerv
call).
|
Description
gluLoadSamplingMatrices
uses
model
,
perspective
, and
view
to recompute the sampling and culling
matrices stored in
nurb
.
The sampling matrix determines how finely a NURBS curve or surface
must be tessellated to satisfy the sampling tolerance (as determined by the
GLU_SAMPLING_TOLERANCE
property).
The culling matrix is used in deciding if a NURBS curve or surface
should be culled before
rendering (when the
GLU_CULLING
property is turned on).
gluLoadSamplingMatrices
is necessary only if the
GLU_AUTO_LOAD_MATRIX
property is turned
off (see
gluNurbsProperty
).
Although it can be convenient to leave the
GLU_AUTO_LOAD_MATRIX
property turned on, there can be a performance penalty for doing so.
(A round trip to the GL server is needed to fetch the current values
of the modelview matrix, projection matrix, and viewport.)
See Also
Copyright
Copyright
1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/
.