Retrieving Deformed Splines

JohnThomas

Hello,

I'm trying to get access to the result of a spline that has been deformed by a Bend. I've attached a scene file with a cloner mimicking the behavior I want to achieve, but I haven't been able to do it yet.

Using GetCache().GetDeformCache() isn't returning just the four points of the circle and I'm not sure another way to get a deformed spline. This seems like it would be rather simple but I'm not sure where to proceed.

Deformed Circle.c4d

Johan

r_gigante

Hi Johan, thanks for reaching out us.

With regard to your request, I warmly suggest to have a look at:

c4d.utils.SplineHelp
- SplineHelp.SplineToLineIndex() to find a correspondence between spline points and their sibling in the cache representation
BaseObject.GetCache() to see how to properly retrieve a geometry cache
BaseObject.GetRealSpline() to retrieve a real spline from a spline generator

A first attempt to make it work should look like this:

import c4d


def DoRecursion(op, index):
    tp = op.GetDeformCache()
    if tp is not None:
        DoRecursion(tp, index)
    else:
        tp = op.GetCache()
        if tp is not None:
            DoRecursion(tp, index)
        else:
            if not op.GetBit(c4d.BIT_CONTROLOBJECT):
                if op.IsInstanceOf(c4d.Opoint):
                    for i in index:
                        print "\t\t", op.GetAllPoints()[i]

    tp = op.GetDown()
    while tp is not None:
        DoRecursion(tp, index)
        tp = tp.GetNext()

# Main function
def main():
    # get the real spline representation
    realSpline = op.GetRealSpline()
    if realSpline is None:
        return
    
    # allocate a SplineHelp instance and init it with the real spline
    splineH = c4d.utils.SplineHelp()
    splineH.InitSplineWith(realSpline)
    
    # get the spline points and store its length
    splinePnts = realSpline.GetAllPoints()
    splinePntsCnt = len(splinePnts)
    
    # allocate a list to store the correspondance between the spline points and the one belonging to its line representation
    pntIndxInLine = []
    for i in xrange(splinePntsCnt):
        pntIndxInLine.append(splineH.GetPointIndex(i, 0)/splinePntsCnt)
    
    # recurse over the geometry to look for its cache
    DoRecursion(op, pntIndxInLine)
    
    # free the SplineHelp instance
    splineH.FreeSpline()

# Execute main()
if __name__=='__main__':
    main()

Best, Riccardo

JohnThomas

Thanks for the reply, it really helped me out.

John