![]() ![]() If all the arguments are present, Vol 0 indexes the red channel of RGB_TABLE0, Vol 1 indexes the green channel of RGB_TABLE0, and Vol 2 indexes the blue channel of RGB_TABLE0.Src = (RGB_TABLE0*RGB_TABLE1)/ 256 srcalpha = (OPACITY_TABLE0*OPACITY_TABLE1)/ 256 If Vol 0 and Vol 1 are the only arguments present, the two volumes are blended together using independent tables:.Src = RGB_TABLE0 srcalpha = OPACITY_TABLE0 If Vol 0 is the only argument present, the values of src and srcalpha are taken directly from the RGB and OPACITY tables, as indexed by each volume data sample:.The number of volume arguments determine how the src and srcalpha values for the COMPOSITE_FUNCTION are computed: The number of volumes present and the value of the COMPOSITE_FUNCTION keyword determine how the volume data is rendered by the iVolume tool. If more than one volume is specified, they must all have the same dimensions. Arrays of strings, structures, object references, and pointers are not allowed. By default, the tool uses the minimum and maximum values of all volume parameters to uniformly byte-scale the data.Ī three-dimensional array of any numeric type containing volume data. The minimum and maximum values used by the BYTSCL function may be adjusted in the volume’s property sheet. This scaling is done for display purposes only the iVolume tool maintains the original data as supplied with the arguments for use in other operations. Note: The volume data provided in the Vol 0, Vol 1, Vol 2, and Vol 3 arguments are scaled into byte values (ranging from 0 to 255) with the BYTSCL function to facilitate using the volume data as indices into the RGB and OPACITY tables. This could alter the volume data values if the incoming data cannot accurately be stored as BYTE data. Thus, all incoming volume data is converted to BYTE type. Note: IDL converts and stores volume data in a BYTE array. Note: If no arguments are specified, the IVOLUME procedure creates an empty Volume tool. Please see VOLUME() which has replaced the functionality of the IVOLUME routine. ![]()
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