How can I get a 3d color graph in Matlab using disceret data?

Dear M/S
 I have 4 vectors , three of them are each points coordinates(x,y,z) with 400,000 rows. The fourth vector (c) is the same size of other vectors. I want to have a 3d plot with x(i),y(i),z(i) as each point's location and c(i) be the color correspond to each point. I tried scatter3 but it doesn't give me a good plot (it is masked )since my data locations are too close to each other (lots of data) and also I want to have interpolation between the data. So, it would be a colorful cube which color in each point shows the related magnitude in "c" vector. I also tried "slice" command to have color faces in the cube but it doesn't plot it because my "c"  is not a 3d matrix and is not specified as a function of coordinates, it just has a magnitude correspond to that point.
Could you please help me on how to do that and what are the options to have such a cube?