Is used to compute the final pixel color. The most opaque voxel’s color appropriation is then reflected by the pixel on the viewing plane.

The value of each pixel on the viewing plane is set to the brightest voxel, as determined by its opacity. 1 = MIP: Maximum intensity projection.The recursive equationĭest' = src * srcalpha + dest * (1 - srcalpha) The composite function determines the value of a pixel on the viewing plane by analyzing the voxels falling along the corresponding ray, according to one of the following compositing functions: If the total number of clipping planes exceeds the limit, an informational message is displayed. Some of these clipping planes may already be in use by the tool to support specific data display features. Note: A window is only able to support a limited number of clipping planes. If defined, CUTTING_PLANES will be applied first, then the CLIP_PLANES (until a maximum number of planes is reached). Note: Clipping planes are equivalent to the obsolete cutting planes. By default, the value of this keyword is a scalar (-1) indicating that no clipping planes are to be applied. Portions of this object that fall in the half space A x + B y + C z + D > 0 will be clipped. The four coefficients for each clipping plane are of the form, where A x + B y + C z + D = 0. Set this keyword to an array of dimensions specifying the coefficients of the clipping planes to be applied to this object. This keyword is the same as the SUBVOLUME keyword. Set this keyword to a six-element vector of the form, which represents the sub-volume to be rendered. Explicitly set this keyword to zero to disable automatic rendering. Set this keyword to always render the volume each time the tool window is drawn (the default behavior). AMBIENT is applicable only when LIGHTING_MODEL is set. Use this keyword to set the color and intensity of the volume’s base ambient lighting. Note: Keywords to the IVOLUME routine that correspond to the names of registered properties of the iVolume tool must be specified in full, without abbreviation. Note: If all the arguments are present, the composite function cannot be set to the average-intensity projection (COMPOSITE_FUNCTION = 3).test for conditional text Keywords Src = (RGB_TABLE, RGB_TABLE, $ RGB_TABLE)/ 256 srcalpha = (OPACITY_TABLE0)/ 256. The Vol 3 argument indexes OPACITY_TABLE0: 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.

Ivolume license code