Hi John,

I asume that you expect something in the 'plain' created by p0 through p4? So for a certain x and z point you expect one 'valid' y value?

Now in that case, things get quite complicated. In a normal plain (described by 3 points) you can just use some basic maths, but here you've got a 4th point.

In this case you have to define a 4th parameter to handle the curve (or bending of the plain) created by that 4th point. Look at it like it is a part of the surface a sphere. The problem here is that you don't know if it is a sphere and you certainly don't know the radius of the sphere.

So with the given information it is impossible to get a y value, unless you use a 4th paramater to define curve (which can be anything from a nice spherisch thing to more complex things like sinuses, etc...).

Jan

I asume that you expect something in the 'plain' created by p0 through p4? So for a certain x and z point you expect one 'valid' y value?

Now in that case, things get quite complicated. In a normal plain (described by 3 points) you can just use some basic maths, but here you've got a 4th point.

In this case you have to define a 4th parameter to handle the curve (or bending of the plain) created by that 4th point. Look at it like it is a part of the surface a sphere. The problem here is that you don't know if it is a sphere and you certainly don't know the radius of the sphere.

So with the given information it is impossible to get a y value, unless you use a 4th paramater to define curve (which can be anything from a nice spherisch thing to more complex things like sinuses, etc...).

Jan