vpRamp(3) Library Functions Manual vpRamp(3) NAME vpRamp - initialize an array with a piecewise-linear ramp SYNOPSIS #include <volpack.h> vpResult vpRamp(array, stride, num_points, ramp_x, ramp_y) float *array; int stride; int num_points; int *ramp_x; float *ramp_y; ARGUMENTS array Output array. stride Stride from one array element to the next, in bytes. num_points Number of entries in the input arrays (ramp_x and ramp_y). ramp_x Input array containing indices into array. ramp_y Input array containing values to store into array. DESCRIPTION vpRamp is a utility routine for initializing linear arrays of floating- point numbers with piecewise-linear ramps. A ramp is defined by a set of (x, y) pairs. The X coordinates are integers that index entries in the ar- ray argument, and the Y coordinates are floating-point values to store into the array. Linearly-interpolated Y values are stored in array elements with indexes in between two of the X values. The values in ramp_x most be strictly increasing. The stride argument may be used to skip array elements or to initialize arrays with a non-standard stride. If the output array is a simple linear array of type float then the stride should be sizeof(float). This function is useful for creating lookup tables used for opacity trans- fer functions (see vpSetClassifierTable(3)) and shading functions (see vpSetLookupShader(3)). ERRORS The normal return value is VP_OK. The following error return value is pos- sible: VPERROR_BAD_VALUE The number of points is less than one or the X values are not strictly increasing. SEE ALSO VolPack(3) VolPack vpRamp(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | ERRORS | SEE ALSO
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