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vpSeti(3) Library Functions Manual vpSeti(3) NAME vpSeti, vpSetd - set the value of an option SYNOPSIS #include <volpack.h> vpResult vpSeti(vpc, option, value) vpContext *vpc; int option; int value; vpResult vpSetd(vpc, option, value) vpContext *vpc; int option; double value; ARGUMENTS vpc VolPack context from vpCreateContext. option Constant that specifies the option to be set. value New value for the option. DESCRIPTION These functions are used to set the values of integer- or double-valued options in a rendering context. The following list summarizes the in- teger-valued options that can be set with vpSeti: VP_CONCAT_MODE Choose whether transformation matrices are premultiplied or postmultiplied. If value is VP_CONCAT_LEFT then matrices are premultiplied. If value is VP_CONCAT_RIGHT then matrices are postmultiplied. Default: VP_CONCAT_RIGHT. VP_DEPTH_CUE_SIZE_HINT Set the suggested number of entries in the depth cueing lookup table. See vpSetDepthCueing(3). Default: none VP_INT_WIDTH_HINT Set the suggested width (in pixels) of the intermediate image work buffer. See vpRenderRawVolume(3). Default: none VP_INT_HEIGHT_HINT Set the suggested height (in pixels) of the intermediate image work buffer. See vpRenderRawVolume(3). Default: none VP_SHADOW_LIGHT Get the current shadow light (see vpSetShadowLookupShader(3)). Legal values are VP_LIGHT0, VP_LIGHT1, ..., VP_LIGHT5. Default: VP_LIGHT0 VP_SHADOW_WIDTH_HINT Set the suggested width (in pixels) of the shadow buffer (see vpSetShadowLookupShader(3)). Default: none VP_SHADOW_HEIGHT_HINT Set the suggested height (in pixels) of the shadow buffer (see vpSetShadowLookupShader(3)). Default: none VP_SHADOW_BIAS Set the current shadow bias value (see vpSetShadowLookup- Shader(3)). The value is an integral distance in units of vox- els. Default: 4 VP_AXIS_OVERRIDE Force the rendering routine to composite along a particular principle viewing axis, regardless of the current viewing direc- tion. Legal values are VP_X_AXIS, VP_Y_AXIS or VP_Z_AXIS. Set the value to VP_NO_AXIS to let VolPack choose the optimal axis automatically (the default). This option is normally used only for debugging. VP_TRACE_SHADOW_K When pixel tracing is enabled (see vpTracePixel(3)) and shadows are enabled (the VP_SHADOW option to vpEnable(3)), this option is used to choose one shadow buffer pixel to trace. The value must be a voxel slice number. The shadow buffer pixel that gets traced is the shadow pixel that affects the traced image pixel at the indicated slice. The following list summarizes the double-valued options that can be set with vpSetd: VP_DEPTH_CUE_QUANTIZATION Set the difference in depth between two adjacent entries in the depth cueing lookup table (see vpSetDepthCueing(3)). Must be greater than 0.0 and less than 1.0. Default: 1/255 VP_MAX_RAY_OPACITY Set the maximum opacity threshold. During rendering, when a pixel's opacity reaches this threshold no more voxels are com- posited into the pixel. To maximize performance, the value should be as low as possible without adversely affecting image quality. Must be in the range 0.0-1.0 (1.0 is the default and 0.95 is the suggested value). Default: 1.0 VP_MIN_VOXEL_OPACITY Set the minimum opacity threshold. During classification, if a voxel's opacity is less than or equal to this threshold then the voxel is discarded before rendering. To maximize performance, the value should be as high as possible without adversely af- fecting image quality. Must be in the range 0.0-1.0 (0.0 is the default and 0.05 is the suggested value). Default: 0.0 ERRORS The normal return value is VP_OK. The following error return values are possible: VPERROR_BAD_OPTION The option argument is invalid. VPERROR_BAD_VALUE The value argument is invalid or out of range. SEE ALSO VolPack(3), vpCreateContext(3), vpGeti(3) VolPack vpSeti(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | ERRORS | SEE ALSO
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