Originally Posted by

**kouma** Hello,

Can someone tell me if what I am doing is correct. I am trying to solve this equation

**what exactly do you want to solve?**

of 0 = n ( p - p0 ) where n, p, and p0 are points on the plane.

**I assume that the term on the RHS of the equation should be a product. But the product of points is not defined.**

For me the equations looks like an equation of a line(of a plane) in normal form in 2D (3D), where $\displaystyle \vec n, \vec p, \overrightarrow{p_0}$ are vectors.

Assume this is a 2D dimension (x,y). Is this the correct way of calculating this equation.

0 = nx (px - p0x) + ny (py - p0y)

**Assuming that $\displaystyle n_x, n_y, ...$ are the components of the vectors $\displaystyle \vec n, ...$ then this transformation is the correct scalar product of vectors. But I still don't know why you are doing this!**

Purpose: I am trying to find if point p resides on the positive or negative side of the plane.

**I don't know the positive or negative side of a plane. About the y-axis, about the x-axis, about what?**

Only help if you know the answer please.

**My reply isn't an answer because you didn't post a question!**

Thanks