Raster3D

Raster3D[{{{a11,a12,…},…},…}] is a three-dimensional graphics primitive that represents a cubical array of gray cells. 

Raster3D[{{{{r11,g11,b11},…},…},…}] represents an array of RGB color cells. 

Raster3D[{{{{r11,g11,b11,α11},…},…},…}] represents an array of color cells with opacity αij.

Raster3D[array,{{xmin,ymin,zmin},{xmax,ymax,zmax}}] represents a three-dimensional graphics primitive by giving the coordinates of opposite corners.

Raster3D[array,coordinates,{amin,amax}] represents a three-dimensional graphics primitive whose voxel values should be scaled so that amin corresponds to 0 and amax corresponds to 1.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.