Slope of a 3dface

[Anonymous]

What is the most efficient way to determine the slope of a 3dface in AutoCAD's VBA?
I managed to get the normal of the 3dface, then I forgot why I had got that far ... clear signs that I really should have got an education, but please help anyway.. thx... Kevin...

[Anonymous]

Given the normal vector (x, y, z) the maximum slope will be in the direction (-x, -y) and have magnitude ((x^2 + y^2)^(1/2)) / z. Is that what you need?

[Anonymous]

Given the normal vector (x, y, z) the maximum slope will be in the direction (-x, -y) and have magnitude ((x^2 + y^2)^(1/2)) / z. Is that what you need?

[Anonymous]

Yep... Thx... You hit the spot, I got so lost finding the Normal that I lost my way, woke up with the solution, then checked back here - and - thx...