normals help

Blitz3D Forums/Blitz3D Programming/normals help

Rob (Posted 2003) [#1]

Hi there, Given nx,ny and nz (normals) how do we determine a slope value? for example when linepicking directly down we return these normals. I would like to translate them into a workable result: a slope value between 0 and 1, with 1 being vertical and 0 being horizontal. I hope you can help :) Rob

fredborg (Posted 2003) [#2]

slope# = 1.0-CollisionNY(blablabla)

Rob (Posted 2003) [#3]

Thanks :)

Floyd (Posted 2003) [#4]

If it's any help the components nx,ny,nz are also the direction cosines for the vector. The normal vector has length 1 and can be considered as a direction. nx = Cosine of angle between vector and positive X axis ny = Cosine of angle between vector and positive Y axis nz = Cosine of angle between vector and positive Z axis So ACos() tells you the various angles.