icetBoundingVertices(3)

NAME

icetBoundingVertices -- set bounds of geometry.

Synopsis

#include <GL/ice-t.h>

void icetBoundingVertices( GLint size,

GLenum type,
GLsizei stride,
GLsizei count,
const GLvoid * pointer );

Description

icetBoundingVertices is used to tell IceT what the bounds of the geometry drawn by the callback registered with icetDrawFunc are. The bounds are assumed to be the convex hull of the vertices given. The user should take care to make sure that the drawn geometry actually does fit within the convex hull, or the data may be culled in unexpected ways. IceT runs most efficiently when the bounds given are tight (match the actual volume of the data well) and when the number of vertices given is minimal.

The size parameter specifies the number of coordinates given for each vertex. Coordinates are given in X-Y-Z-W order. Any Y or Z coordinate not given (because size is less than 3) is assumed to be 0.0, and any W coordinate not given (because size is less than 4) is assumed to be 1.0.

The type parameter specifies in what data type the coordinates are given. Valid types are ICET_SHORT, ICET_INT, ICET_FLOAT, and ICET_DOUBLE, which correspond to types GLshort, GLint, GLfloat, and GLdouble, respectively.

The stride parameter specifies the offset between consecutive vertices in bytes. If stride is 0, the array is assumed to be tightly packed.

The count parameter specifies the number of vertices to set.

The pointer parameter is an array of vertices with the first vertex starting at the first byte.

If data replication is being used, each process in a data replication group should register the same bounding vertices that encompass the entire geometry. By default there is no data replication, so unless you call icetDataReplicationGroup, all process can have their own bounds.

Errors

ICET_INVALID_VALUE

Raised if type is not one of ICET_SHORT, ICET_INT, ICET_FLOAT,

or ICET_DOUBLE.

Warnings

None.

Bugs

None known.

Copyright

Copyright (C)2003 Sandia Corporation

Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive license for use of this work by or on behalf of the U.S. Government. Redistribution and use in source and binary forms, with or without modification, are permitted provided that this Notice and any statement of authorship are reproduced on all copies.

See Also

icetDrawFunc(3), icetBoundingBox(3), icetDataReplicationGroup(3)

IceT