c4d.utils.splinehelp

[Helper]

On 17/08/2015 at 08:18, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R16.050 
Platform:     Mac  ;  Mac OSX  ; 
Language(s) :

---------
Hello all,

Within c4d.utils.splinehelp,     the following functions seem to be wrongly implemented:
    GetNormal: gives Tangent
    GetTangent: gives CrossNormal
    GetCrossNormal: gives Normal

Not an urgent issue, because all functions are there, they just don't seem to have the right name.
A piece of code in which this became evident is attached below. It should be executed from a python generator, with a spline as its child.

kind regards,

Hermen

PS: if this code is going to be updated, a nice extra feature would be the GetMatrix function as described below, which evaluates the matrix at any given offset.
#################  python code  ###################
import c4d
import math as m
#Welcome to the world of Python

def GetMatrix(offset, segment, sh) :
    m1 = c4d.Matrix()
    """
    the following functions seem to be wrongly implemented:
    GetNormal  gives Tangent
    GetTangent gives CrossNormal
    GetCrossNormal gives Normal
    """
    m1.off = sh.GetPosition(offset, segment, realoffset=True)
    m1.v2  = sh.GetTangent(offset, segment, realoffset=True)
    m1.v3  = sh.GetNormal(offset, segment, realoffset=True) # not needed
    m1.v1 = sh.GetCrossNormal(offset, segment, realoffset=True)
    return m1

def main() :
    spl = op.GetDown() # original spline
    sh  = c4d.utils.SplineHelp()
    sh.InitSpline(spl)
    
    N   = 2 * m.pi * 100  # op[c4d.ID_USERDATA,1] # N windings
    R   = 10 # op[c4d.ID_USERDATA,2] # Radius
    reverse = False #op[c4d.ID_USERDATA,3]
    phase   = 0. # op[c4d.ID_USERDATA,4]  
    d   = 6 * N                 # density
    if reverse: N = -N    
    newspl = c4d.SplineObject(d+1, 4)
    pts = range(d+1)

for i in pts:
        #print i
        p = float(i)/d
        m0 = GetMatrix(p, 0, sh=sh)
        t = N * p + phase
        v = R * c4d.Vector(m.cos(t), m.sin(t), 0)
        pts _= m0*v
        if i==10000:
            disc = c4d.BaseObject(c4d.Odisc)
            disc[c4d.PRIM_AXIS] = 4 # z = tangent
            disc.SetMg(m0)
            disc.InsertUnder(newspl)

newspl.SetAllPoints(pts)
    
    return newspl

[Helper]

On 19/08/2015 at 00:07, xxxxxxxx wrote:

Hello,

thanks for reporting this, a bug report was filed. SplineHelp already has a GetMatrix() function.

Best wishes,
Sebastian

[Helper]

On 19/08/2015 at 14:21, xxxxxxxx wrote:

Jee, how could I have missed that?!? I only noticed the "GetVertexMatrix" and never found this one.
Thanks for pointing it out,

Regards,
 
Hermen