/**
* Calcs the position of a substem in the segment given
* a relativ position where in 0..1 - needed esp. for helical stems,
* because the substems doesn't grow from the axis of the segement
*
* @param trf the transformation of the substem
* @param where the offset, where the substem spreads out
* @return the new transformation of the substem (shifted from
* the axis of the segment to the axis of the subsegment)
*/
public DX_Transformation substemPosition(DX_Transformation trf, float where)
{
if (lpar.nCurveV >= 0) // normal segment
{
return(trf.translate(transf.getZ3() * (where * length)));
}
else // helix
// get index of the subsegment
{
int i = (int)(where * (subsegments.Count - 1));
// interpolate position
Vector3 p1 = ((CS_SubsegmentImpl)subsegments[i]).pos;
Vector3 p2 = ((CS_SubsegmentImpl)subsegments[i + 1]).pos;
Vector3 pos = p1 + (p2 - p1) * (where - i / (subsegments.Count - 1));
return(trf.translate(pos - getLowerPosition()));
}
}
/**
* Gives a clone a new direction (splitting)
*
* @param trf The base transformation of the clone
* @param s_angle The splitting angle
* @param nseg The segment number, where the clone begins
* @param nsplits The number of clones
* @return The new direction for the clone
*/
DX_Transformation split(DX_Transformation trf,
float s_angle, int nseg, int nsplits)
{
// applies a split angle to the stem - the Weber/Penn method
int remaining_seg = segmentCount - nseg - 1;
// the splitangle
// FIXME: don't know if it should be nSplitAngle or nSplitAngle/2
float declination = (float)(Math.Acos(trf.getZ3().Z) * 180 / Math.PI);
float split_angle = Math.Max(0, (lpar.nSplitAngle
+ lpar.var(lpar.nSplitAngleV) - declination));
// FIXME: first works better for level 0, second for further levels
// transf = transf.rotxz(split_angle,s_angle)
trf = trf.rotx(split_angle);
// adapt split correction
splitCorrection -= split_angle / remaining_seg;
//t_corr = Transformation().rotx(-split_angle/remaining_seg)
float split_diverge;
if (s_angle > 0)
{ // original stem has s_angle==0
if (par._0BaseSplits > 0 && stemlevel == 0 && nseg == 0)
{
split_diverge = s_angle + lpar.var(lpar.nSplitAngleV);
}
else
{
split_diverge = (float)(20 + 0.75 * (30 + Math.Abs(declination - 90))
* Math.Pow((lpar.var(1) + 1) / 2.0, 2));
if (lpar.var(1) >= 0)
{
split_diverge = -split_diverge;
}
}
trf = trf.rotaxis(split_diverge, DX_Transformation.Z_AXIS);
}
else
{
split_diverge = 0; // for debugging only
}
// adjust some parameters
//split_cnt = split_cnt+1;
// lower substem prospensity
if (!pruneTest)
{
substemsPerSegment /= (float)(nsplits + 1);
// FIXME: same reduction for leaves_per_segment?
}
return(trf);
}
/**
* Calcs a new direction for the current segment
*
* @param trf The transformation of the previous segment
* @param nsegm The number of the segment ( for testing, if it's the
* first stem segment
* @return The new transformation of the current segment
*/
DX_Transformation newDirection(DX_Transformation trf, int nsegm)
{
// next segments direction
// The first segment shouldn't get another direction
// down and rotation angle shouldn't be falsified
if (nsegm == 0)
{
return(trf);
}
/*
* if (Console.debug())
* TRF("Stem.new_direction() before curving",trf);
*/
// get curving angle
double delta;
if (lpar.nCurveBack == 0)
{
delta = lpar.nCurve / lpar.nCurveRes;
}
else
{
if (nsegm < (lpar.nCurveRes + 1) / 2)
{
delta = lpar.nCurve * 2 / lpar.nCurveRes;
}
else
{
delta = lpar.nCurveBack * 2 / lpar.nCurveRes;
}
}
delta += splitCorrection;
/*
* if (Console.debug())
* DBG("Stem.new_direction(): delta: "+delta);
*/
trf = trf.rotx(delta);
// With Weber/Penn the orientation of the x- and y-axis
// shouldn't be disturbed (maybe, because proper curving relies on this)
// so may be such random rotations shouldn't be used, instead nCurveV should
// add random rotation to rotx, and rotate nCurveV about the tree's z-axis too?
// add random rotation about z-axis
if (lpar.nCurveV > 0)
{
// if (nsegm==0 && stemlevel==0) { // first_trunk_segment
// // random rotation more moderate
// delta = (Math.abs(lpar.var(lpar.nCurveV)) -
// Math.abs(lpar.var(lpar.nCurveV)))
// / lpar.nCurveRes;
// } else {
// full random rotation
delta = lpar.var(lpar.nCurveV) / lpar.nCurveRes;
// }
// self.DBG("curvV (delta): %s\n" % str(delta))
double rho = 180 + lpar.var(180);
trf = trf.rotaxisz(delta, rho);
}
//TRF("Stem.new_direction() after curving",trf);
// attraction up/down
if (par.AttractionUp != 0 && stemlevel >= 2)
{
double declination = Math.Acos(trf.getZ3().Z);
// I don't see, why we need orientation here, may be this avoids
// attraction of branches with the x-Axis up and thus avoids
// twisting (see below), but why branches in one direction should
// be attracted, those with another direction not, this is unnaturally:
// double orient = Math.acos(trf.getY().getZ());
// double curve_up_orig = par.AttractionUp * declination * Math.cos(orient)/lpar.nCurveRes;
// FIXME: devide by (lpar.nCurveRes-nsegm) if last segment
// should actually be vertical
double curve_up = par.AttractionUp *
Math.Abs(declination * Math.Sin(declination)) / lpar.nCurveRes;
Vector3 z = trf.getZ3();
// FIXME: the mesh is twisted for high values of AttractionUp
trf = trf.rotaxis(-curve_up * 180 / Math.PI, new Vector3(-z.Y, z.X, 0));
// trf = trf.rotx(curve_up*180/Math.PI);
}
return(trf);
}
// makes the segments of the stem
int makeSegments(int start_seg, int end_seg)
{
// if (start_seg>end_seg) throw new ArbaroException("Error in segment creation end_seg<start_seg.");
if (stemlevel == 1)
{
tree.updateGenProgress();
}
//if (par.verbose) {
/*
* if (! pruneTest) {
* if (stemlevel==0) Console.progressChar('=');
* else if (stemlevel==1 && start_seg==0) Console.progressChar('/');
* else if (stemlevel==2 && start_seg==0) Console.progressChar();
* }
* //}
*/
DX_Transformation trf = transf;
for (int s = start_seg; s < end_seg; s++)
{
if (stemlevel == 0)
{
tree.updateGenProgress();
}
if (!pruneTest)
{// && par.verbose) {
//if (stemlevel==0) Console.progressChar('|');
}
// curving
trf = newDirection(trf, s);
/*
* if (Console.debug())
* TRF("Stem.make_segments(): after new_direction ",trf);
*/
// segment radius
float rad1 = stemRadius(s * segmentLength);
float rad2 = stemRadius((s + 1) * segmentLength);
// create new segment
CS_SegmentImpl segment = new CS_SegmentImpl(this, s, trf, rad1, rad2);
segment.make();
segments.Add(segment);
// create substems
// self.DBG("SS-makingsubst? pt: %d, lev: %d\n"%(self.prunetest,self.level))
if (!pruneTest && lpar.level < par.Levels - 1)
{
// self.DBG("SS-making substems\n")
makeSubstems(segment);
}
if (!pruneTest && lpar.level == par.Levels - 1 && par.Leaves != 0)
{
makeLeaves(segment);
}
// shift to next position
trf = trf.translate(trf.getZ3() * (segmentLength));
//self.DBG("transf: %s\n"%(transf))
//self.DBG("pos: %s\n"%(transf.vector))
// test if too long
if (pruneTest && !isInsideEnvelope(trf.getT()))
{
// DBG("PRUNE: not inside - return %d\n"%(s))
return(s);
}
// splitting (create clones)
if (s < end_seg - 1)
{
int segm = makeClones(trf, s);
// trf is changed by make_clones
// prune test - clone not inside envelope
if (segm >= 0)
{
//DBG("PRUNE: clone not inside - return %d\n"%(segm))
return(segm);
}
}
}
return(-1);
}
