private void AddBranchesToSegment(TreeSegment segment, double absoluteAngle)
{
if (segment.Depth == MaxDepth)
{
return;
}
if (segment.Thickness < 0.002)
{
return;
}
const double maxDevAngle = 0.1 * TAU;
const double gravityNormal = 0.75 * TAU;
var deltaAngle = Math.Atan2(Math.Sin(gravityNormal - absoluteAngle), Math.Cos(gravityNormal - absoluteAngle));
if (Math.Abs(deltaAngle) < maxDevAngle)
{
return;
}
var randomDeviationAngle = random.NextDouble() * 2 * MaxRotationFactor - MaxRotationFactor;
var deviationAngle = BiasedValue(0, randomDeviationAngle, 1);
var branchingSpread = random.UniformRandom(BranchSpreadMin, BranchSpreadMax);
if (segment.Depth == 0)
{
AddAngledBranch(segment, deviationAngle - branchingSpread / 2, absoluteAngle);
AddAngledBranch(segment, deviationAngle + branchingSpread / 2, absoluteAngle);
AddAngledBranch(segment, deviationAngle, absoluteAngle);
}
else if (random.NextDouble() <= ProbabilitySingleBranch)
{
// no branching
AddAngledBranch(segment, deviationAngle, absoluteAngle);
}
else
{
// branching
var leftAngle = deviationAngle - branchingSpread / 2;
var rightAngle = deviationAngle + branchingSpread / 2;
if (random.NextDouble() < 0.8)
{
var rndAngle = random.UniformRandom(deviationAngle - branchingSpread, deviationAngle + branchingSpread);
var thickness = random.UniformRandom(0.25, 0.5);
AddAngledBranch(segment, rndAngle, absoluteAngle, extraThicknessFactor: thickness);
}
AddAngledBranch(segment, leftAngle, absoluteAngle);
AddAngledBranch(segment, rightAngle, absoluteAngle);
}
}