How to plot 3D point clouds with color changes with respect to z?

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Xiaochen on 19 May 2011
I'm doing 3D face surface data visulization. The data is a N*3 matrix, of which the 1st column represents x of every point, 2nd represents y and 3rd represents z. I want to use point-based model. So I think the function "plot3" must be the choice. But how can I use plot3 to draw each points (x,y,z) with color determined by z so that color is propotional to surface height?
I know mesh can do that, but I dont want a mesh model. I need a point-based model so that I could do further manipulation like two point sets registration.
If any one could answer me, I would very appreciate!!

Answers (2)

Andrew Newell
Andrew Newell on 19 May 2011
The easiest thing to do would be to plot pixels using imagesc.
Or you could use scatter3 (see this answer).
EDIT: If scatter3 is too slow for you, maybe fscatter3 from the FEX will help.
  1 Comment
Xiaochen on 19 May 2011
I can't use pixels, they are 3D points. I need them to to be realistic. Scatter seems reasonable but I've tried, it's very slow.

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