Enable (3)

#include <volpack.h>

\$1 vpEnable(vpc, option, value)

• vpContext *vpc; int option; int value;

vpc

VolPack context from vpCreateContext.

option

Constant that specifies the option to be adjusted.

value

New value for the option (boolean: 0 or 1).

vpEnable is used to enable or disable boolean options in a rendering context. If the value option is 0 then the option is disabled; otherwise it is enabled. The following list summarizes all available options:

VP_LIGHT0

VP_LIGHT1

VP_LIGHT2

VP_LIGHT3

VP_LIGHT4

VP_LIGHT5

Enable the corresponding light source (see vpSetLight(3)). Default: VP_LIGHT0 is enabled, and all others are disabled.

VP_LIGHT_BOTH_SIDES

Enable two-sided lighting (see vpSetLight(3)). Default: disabled

VP_REVERSE_SURFACE_SIDES

Reverse the definition of interior and exterior surfaces (see vpSetMaterial(3)). Default: disabled

VP_DEPTH_CUE

Enable depth cueing (see vpSetDepthCueing(3)). Default: disabled

VP_VIEW_X_AXIS

VP_VIEW_Y_AXIS

VP_VIEW_Z_AXIS

Enable computing a preclassified volume for the corresponding major viewing axis (see vpClassifyVolume(3)). Default: enabled

VP_SHADOW

Enable rendering shadows (see vpSetShadowLookupShader(3)). Default: disabled

VP_CLAMP_SHADE_TABLE

Enable clamping the color components in a shade table to the range 0.0-255.0. This option affects vpShadeTable(). Default: enabled

The normal return value is VP_OK. The following error return value is possible:

VPERROR_BAD_VALUE

The option argument is invalid.

VolPack(3), vpCreateContext(3)