Yes that works, Thanks,
although to be picky, is a Z of i + 0.5, irregular?

Hi, I'm trying to create a surface that uses floating point X Y and Z values ( also the X and Z values may not be a fixed distance apart, but they are in this example). If you try the example you get a simple surface :- aSurfaceSeries := TSurfaceSeries.Create(Chart1); aSurfaceSeries.ParentChart := C...

Hi,
I'm still having trouble trying to place the pen in the correct point if I know the X Z (and even Y) values?
Thanks

I managed to get TNearestPoint working, I can edit the value so that the Y value increases when I move the mouse up and down when I move it down, but I can't get the correct value to change to so that Y point 'keeps up' with the pen, I have tried using YScreenToValue but this doesn't work for 3D, on...

Hi, I want to create a surface chart which has 3 features:- 1) The user can select the X and Z values and a pen image should then be draw at the Z point on the surface, I can draw the pen but I am lost as to how to calculate the X Y Screen values 2) The user should then be able to edit the value by ...